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User Manual Lrp820
OPERATOR'S MANUAL LRP820-Series Long-Range Passive Reader/Writers Manual Revision 3, July, '00 Publication #17-1269 Escort Memory Systems Warranty Escort Memory Systems warrants that all products of its own manufacture conform to Escort Memory Systems specifications and are free from defects in material and workmanship when used under normal operating conditions and within the service conditions for which they were furnished. The obligation of Escort Memory Systems hereunder shall expire one (1) year after delivery, unless otherwise specified, and is limited to repairing, or at its option, replacing without charge, any such product which in Escort Memory System's sole opinion proves to be defective within the scope of this Warranty. In the event Escort Memory Systems is not able to repair or replace defective products or components within a reasonable time after receipt thereof, Buyers shall be credited for their value at the original purchase price. Escort Memory Systems must be notified in writing of the defect or nonconformity within the warranty period and the affected product returned to Escort Memory Systems factory or to an authorized service center within thirty (30) days after discovery of such defect or nonconformity. Shipment shall not be made without prior authorization by Escort Memory Systems. This is Escort Memory Systems' sole warranty with respect to the products delivered hereunder. No statement, representation, agreement or understanding oral or written, made by an agent, distributor, representative, or employee of Escort Memory Systems which is not contained in this warranty, will be binding upon Escort Memory Systems, unless made in writing and executed by an authorized Escort Memory Systems employee. Escort Memory Systems makes no other warranty of any kind whatsoever, expressed or implied, and all implied warranties of merchantability and fitness for a particular use which exceed the aforestated obligation are hereby disclaimed by Escort Memory Systems and excluded from this agreement. Under no circumstances shall Escort Memory Systems be liable to Buyer, in contract or in tort, for any special, indirect, incidental, or consequential damages, expenses, losses or delay however caused. Equipment or parts which have been subject to abuse, misuse, accident, alteration, neglect, unauthorized repair or installation are not covered by warranty. Escort Memory Systems shall make the final determination as to the existence and cause of any alleged defect. No liability is assumed for expendable items such as lamps and fuses. No warranty is made with respect to custom equipment or products produced to Buyer's specifications except as specifically stated in writing by Escort Memory Systems in the contract for such custom equipment. This warranty is the only warranty made by Escort Memory Systems with respect to the goods delivered hereunder, and may be modified or amended only by a written instrument signed by a duly authorized officer of Escort Memory Systems and accepted by the Buyer. Extended warranties of up to four years are available for purchase for most EMS products. Contact EMS or your distributor for more information. This document contains proprietary information which is protected by copyright. All rights are reserved. The information in this manual has been carefully checked and is believed to be accurate; however, no responsibility is assumed for possible inaccuracies or omissions. Specifications are subject to change without notice. EMS®, Escort Memory Systems® and the EMS® logo are registered trademarks of Escort Memory Systems, a Datalogic Group Company. Other brand and product names mentioned are trademarks or registered trademarks of their respective holders. Escort Memory Systems A Datalogic Group Company 170 Technology Circle Scotts Valley, CA 95066 Telephone (831) 438-7000 FAX (831) 438-5768 www.ems-rfid.com email: info@ems-rfid.com ii Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer TABLE OF CONTENTS GETTING STARTED 1.1 1.2 3.5 3.6 3.7 3.8 3.9 Dimensions . . . . . . . . . . . . . . . . . . . . 4 RF Range and Orientation . . . . . . . . . . . . . . 7 Mounting Guidelines. . . . . . . . . . . . . . . . 12 Guidelines . . . . . . . . . . . . . . . . . . . . 13 14 Connector Panel . . . . . . . . . . . . . . . . . 14 Power Connector . . . . . . . . . . . . . . . . . 15 COM1/COM2 Connector . . . . . . . . . . . . . 15 MUX32 Connector . . . . . . . . . . . . . . . . 16 Serial Communications Cabling . . . . . . . . . . . 16 Input Connector . . . . . . . . . . . . . . . . . . 17 Output Connector . . . . . . . . . . . . . . . . . 17 Digital I/O Wiring. . . . . . . . . . . . . . . . . 18 Power Requirement . . . . . . . . . . . . . . . . 23 Power Options . . . . . . . . . . . . . . . . . . 23 Power from the MUX32 Bus . . . . . . . . . . . . 24 Power via the external supply connector . . . . . . . 24 Power from the MUX32 bus and from an external power supply . . . . . . . . . . . . . . . . . . . . . . 26 LED Indicators . . . . . . . . . . . . . . . . . . 27 SERIAL AND BUS COMMUNICATIONS 4.1 4.2 POWER AND ELECTRICAL INTERFACE 3.1 3.2 3.3 3.4 Introduction . . . . . . . . . . . . . . . . . . . . 1 Unpacking and Inspection . . . . . . . . . . . . . . 3 MECHANICAL SPECIFICATIONS 2.1 2.2 2.3 Serial Interfaces . . . . . . . . . . Digital Board DIP Switch . . . . . Bus Interfaces. . . . . . . . . . . MUX32 Interface Board DIP Switch MENU CONFIGURATION 5.1 5.2 29 29 30 32 33 34 How to Enter Menu Configuration . . . . . . . . . 34 Set-up Operating Parameters . . . . . . . . . . . . 35 Set COM1 Parameters . . . . . . . . . . . . . . . 36 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer iii 5.3 5.4 5.5 RFID INTERFACE 6.1 6.2 6.3 6.4 iv Set COM2 Parameters . . . Set Operating Mode . . . . Set RF Communication . . Restore Factory Defaults . . Return to Main Menu . . . Download New Program . . Downloading DSP Firmware Exit to Operating Mode . . 36 36 38 38 39 39 39 40 41 Introduction . . . . . . . . . . . . . . . . . Command Timeout . . . . . . . . . . . . . . MUX32 and Anticollision Limitations . . . . . . ABx Error Codes . . . . . . . . . . . . . . . Non-Anticollision Error Codes . . . . . . . . . . ABx Standard. . . . . . . . . . . . . . . . . ABx Fast . . . . . . . . . . . . . . . . . . . Anticollision Status Byte . . . . . . . . . . . . Anticollision Commands . . . . . . . . . . . . Family Interrogation . . . . . . . . . . . . . . Family ID . . . . . . . . . . . . . . . . . . Anticollision Index . . . . . . . . . . . . . . ABx Standard Protocol . . . . . . . . . . . . ABxS Command 4 (04H): Fill Tag . . . . . . . ABxS Command 5 (05H): Block Read . . . . . . ABxS Command 6 (06H): Block Write. . . . . . ABxS Command 7 (07H): Read Tag Serial Number ABxS Command 8 (08H): Tag Search . . . . . . ABxS Command D (0DH): Continuous Block Read ABxS Command 10 (10H): Set Output . . . . . . ABxS Command 11 (11H): Input Status . . . . . ABxS Command 84 (84H): Fill Tag All . . . . . ABxS Command 85 (85H): Block Read All. . . . ABxS Command 86 (86H): Block Write All . . . ABxS Command 87 (87H): Read Tag SN All . . . ABxS Command 88 (88H): Tag Search All . . . . ABxS Command 89 (89H): EAS Set/Reset All . . ABxS Command 8A (8AH): EAS Start/Stop . . . ABxS Command 8D (8DH): Continuous Read All. ABxS Command 8E (8EH): Memory Lock All . . 41 41 43 44 44 44 45 46 47 47 47 48 49 49 51 53 55 56 57 60 62 64 66 68 70 72 73 75 77 79 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 6.5 6.6 ABxS Command 94 (94H): SN Fill . . . . . . . . . 81 ABxS Command 95 (95H): SN Block Read. . . . . . 83 ABxS Command 96 (96H): SN Block Write . . . . . 85 ABxS Command 97 (97H): SN Block Read All . . . . 87 ABx Fast Protocol. . . . . . . . . . . . . . . . . 89 ABx Command Packet Structure: . . . . . . . . . . 89 Command/Response Size. . . . . . . . . . . . . . 90 Checksum . . . . . . . . . . . . . . . . . . . . 91 ABxF Command 4 (04H): Fill Tag . . . . . . . . . 92 ABxF Command 5 (05H): Block Read . . . . . . . . 94 ABxF Command 6 (06H): Block Write . . . . . . . 96 ABxF Command 7 (07H): Read Tag Serial Number . . 98 ABxF Command 8 (08H): Tag Search . . . . . . . 100 ABxF Command D (0DH): Continuous Block Read . 101 ABxF Command 10 (10H): Set Output . . . . . . . 104 ABxF Command 11 (11H): Input Status. . . . . . . 106 ABxF Command 84 (84H): Fill All. . . . . . . . . 108 ABxF Command 85 (85H): Block Read All . . . . . 110 ABxF Command 86 (86H): Block Write All . . . . . 112 ABxF Command 87 (87H): Read Tag SN All . . . . 114 ABxF Command 88 (88H): Tag Search All . . . . . 116 ABxF Command 89 (89H): EAS Set/Reset All. . . . 118 ABxF Command 8A (8AH): EAS Start/Stop. . . . . 120 ABxF Command 8D (8DH): Continuous Read All . . 123 ABxF Command 8E (8EH): Memory Lock All . . . 126 ABxF Command 94 (94H): SN Fill. . . . . . . . . 128 ABxF Command 95 (95H): SN Block Read . . . . . 130 ABxF Command 96 (96H): SN Block Write . . . . 132 ABxF Command 97 (97H): SN Block Read All . . . 134 ABx ASCII Protocol . . . . . . . . . . . . . . . 138 Command Packet Structure: . . . . . . . . . . . . 138 Command/Response Size . . . . . . . . . . . . . 139 Checksum . . . . . . . . . . . . . . . . . . . . 140 Example ASCII Command . . . . . . . . . . . . 140 APPENDIX: SPECIFICATIONS 142 APPENDIX: MODELS 143 APPENDIX: ASCII CHART 144 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer NOTICE This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try and correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and the receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. CAUTION Changes or modifications not expressly approved by Escort Memory Systems could void the user’s authority to operate the equipment. vi Copyright © 2000 Escort Memory Systems LRP-Series Long-Range Passive Reader/Writer 1 GETTING STARTED 1.1 Introduction Escort Memory Systems' passive read/write system is a complete family of field-proven read/write Radio-Frequency Identification products. The system consists of RFID tags, reader/writers, antennas, controllers, bus interfaces, and ancillary equipment. Tags can be attached to a product or its carrier and act as an electronic identifier, job sheet, portable database, or manifest. Tags are read and updated via an Escort Memory Systems Reader/Writer, through any nonconductive material, while moving or standing still. Escort Memory Systems' LRP-Series long range passive RFID system is the latest in our line of high performance, industrial RFID equipment. The passive design of the LRP read/write system uses the RF field from the antenna to power the tag, eliminating the need for tag batteries. The LRP passive read/write system is designed to provide cost effective RFID data collection and control solutions to automation and material handling applications. The LRP system uses the internationally recognized ISM frequency of 13.56 MHZ to both power the tag, and to establish a radio link to transfer the information. The LRP820 is specifically designed to work with LRP-Series passive tags, which provide 48 bytes of reprogrammable memory. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer The LRP820 supports the multidrop protocol MUX32. The LRP820 is encased in a NEMA4 enclosure and features two serial ports, 4 optoisolated inputs, 4 opto-isolated outputs. The LRP820-04 is equipped with an antenna designed for conveyor mounting and the LRP820-08 features a rectangular plate antenna. The COM1 serial port is used to receive commands from the host and to send the data back. The LRP820 COM1 can be configured either as MUX32, RS232, or RS422 interface. COM2 is an RS232 serial port used to download new software releases and to setup the configuration parameters. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 1.2 Unpacking and Inspection Unpack the LRP820 and documentation and retain the original shipping carton and packing material in case any items need to be returned. Inspect each item carefully for evidence of damage. If any item appears to be damaged, notify your distributor immediately. The LRP820 is delivered with the following components: LRP820 (-04, -08) Reader/Writer LRP820 to Antenna cable LRP820 Operator's Manual The following components are required for configuring a complete system: LRP-Series Passive Read/Write Tags User supplied LRP820-to-host cable MUX32 host 18 - 30 Vdc, 36 W (1.5 A @ 24 Vdc) power supply Mating connectors. See Appendix B for more information Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 2 MECHANICAL SPECIFICATIONS 2.1 Dimensions Figure 1 gives the dimensions for the LRP820. Figures 2-3 show the dimensions of the 04 and 08 remote antennas. inches mm Figure 1 — LRP820 Dimensions Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer inches mm Figure 2 — LRP-04 Conveyor-Mount Antenna Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer inches mm Figure 3 — LRP-08 Antenna Dimensions Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 2.2 RF Range and Orientation Figure 4 shows the correct tag orientation as it passes the antenna. Tables 1 and 2 give the typical ranges of the LRP series tags. Tables 1- 3 give the typical and guaranteed ranges of the LRP series tags. Figure 4 — LRP-08 to Tag Orientation Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Table 1 — Antenna to Tag Ranges, LRP-04 Antenna with Metal* Tag Typical Range (Z) inches/mm Guaranteed Range inches/mm LRP125(HT) 2.50/64 2.00/51 LRP250(HT) 6.75/171 6.00/152 LRP250HT-FLX 6.75/171 6.00/152 LRP-L5555 6.75/171 6.00/152 LRP-L2666 5.75/146 5.00/127 LRP-L4982 8.00/203 7.00/178 LRP-L90140 9.00/229 8.00/203 LRP-P125 2.50/64 2.00/51 LRP-P3858 6.00/152 5.00/127 LRP-P5050 7.00/178 6.00/152 *These ranges are determined with metal near the -04 antenna as it would be in most conveyor mountings. The actual tuning and testing of the -04 antenna is done with the antenna mounted between two metal rollers on metal rails. The metal rollers are mounted 1/4” from the antenna. NOTE: Proximity to metal, CRT devices and other sources of electromagnetic radiation may affect antenna range. Figure 5 — Side View of RF Field, LRP-04 Antenna, Metal Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Figure 6 — End View of RF Field, LRP-04 Antenna, Metal Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Table 2 — Antenna to Tag Ranges, LRP-04 Antenna, No Metal* Tag Typical Range (Z) inches/mm Guaranteed Range inches/mm LRP125(HT) 3.00/76 2.25/57 LRP250(HT) 8.50/216 7.50/191 LRP250HT-FLX 8.50/216 7.50/191 LRP-L5555 8.50/216 7.50/191 LRP-L2666 7.00/128 6.00/152 LRP-L4982 10.00/254 9.00/229 LRP-L90140 12.00/305 11.00/279 LRP-P125 3.00/76 2.25/57 LRP-P3858 7.50/190 6.50/165 LRP-P5050 8.50/216 7.50/191 *These ranges calculated with no metal near the antenna. NOTE: Proximity to metal, CRT devices and other sources of electromagnetic radiation may affect antenna range. Figure 7 — End View of RF Field, LRP-08 Antenna, No Metal 10 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Figure 8 — Side View of RF Field, LRP-08 Antenna, No Metal Table 3 — Antenna to Tag Ranges, LRP-08 Antenna, No Metal Tag Typical Range (Z) inches/mm Guaranteed Range inches/mm LRP125(HT) 8.00/203 7.00/178 LRP250(HT) 17.00/432 15.00/381 LRP250HT-FLX 17.00/432 15.00/381 LRP-L5555 17.00/432 15.00/381 LRP-L2666 16.00/406 13.00/330 LRP-L4982 20.00/508 18.00/457 LRP-L90140 25.00/635 22.00/559 LRP-P125 8.00/203 7.00/178 LRP-P3858 16.00/406 14.00/355 LRP-P5050 17.00/432 15.00/381 *These ranges calculated with no metal near the antenna. NOTE: Proximity to metal, CRT devices and other sources of electromagnetic radiation may affect antenna range. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 11 2.3 Mounting Guidelines Electromagnetic radiation and metal affect the range of the LRP820. Mount the LRP820 and antenna to minimize the impact of these factors. The RF field of the antenna can also cause errors when antennas are spaced too closely together. Do not position adjacent antennas closer than 2 meters from each other. The mounting holes are accessed through the inside of the LRP820 Reader/Writer. Refer to Figure 9 for locations and dimensions. The remote antennas for the LRP820 have a cable length 2 meters. Surrounding the antenna with metal will greatly reduce the reading range of the antenna. As rule of thumb, keep any metal structure away from the antenna at least more than the reading range along the axis, and a third of such distance on the side. inches mm Figure 9 — LRP820 Mounting Holes 12 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Special mounting instructions must be followed to get optimal read/write performance from the LRP820-08 antenna. Mount the antenna with a minimum 5.90" (150mm) spacing from any metal to the back or sides of the antenna, as shown in Figure 10. inches mm Figure 10 — Antenna Mounting, -08 Guidelines Isolate the LRP820 and antenna from electromagnetic radiation. Avoid surrounding LRP820 and remote antenna with metal. Maintain at least 2 meters minimum spacing between adjacent LRP820s or antennas. Stay within the guaranteed range for the tag to be used. Conform with EIA RS232, RS422 and RS485 standards. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 13 3 POWER AND ELECTRICAL INTERFACE 3.1 Connector Panel Figure 11 shows the LRP connectors, LEDs and connector panel. Unused connectors can be sealed with optional connector caps. Please see Appendix B for ordering information. Figure 11 — Connector Panel 14 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 3.2 Power Connector Figure 12 shows the power connector pin designations. Figure 12 — Power Connector 3.3 COM1/COM2 Connector Figure 13 shows the connector pin designations for the COM port connections. Figure 13 — COM1/COM2 Connector Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 15 3.4 MUX32 Connector Figure 14 shows the connections for the MUX32/RS485 connector. Figure 14 — MUX32 Connector Pinouts Serial Communications Cabling Escort Memory Systems recommends that you use Belden cables 3082A (trunkline) and 3084A (dropline) for RS485/RS422 communications. Use Belden cable 9941 for RS232 communications. More information on Belden cables can be found on their web site at www.belden.com. 16 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 3.5 Input Connector Figure 15 shows the Input Connector pin designations. Figure 15 — Input Connector Pinouts 3.6 Output Connector Figure 16 shows the Output Connector pin designations. Figure 16 — Output Connector Pinouts Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 17 3.7 Digital I/O Wiring Both the Digital Inputs and Digital Outputs are optically isolated circuits with no common path between any channel terminal and another channel, or between any channel and the LRP820 power. Because they are independent and floating, the external wiring controls their use. The inputs can be configured for sensors with a PNP or NPN output. The outputs can be configured in a Sourcing or Sinking configuration. The examples in Figures 17 through 24 show different connections for common input and output devices. Inputs The +IN terminal must be at a higher positive potential than the -IN terminal for current to be sensed correctly. The voltage range is 4.5 to 30V between the +IN and the -IN inputs and the maximum current is 25 mA. Outputs The output is limited to 30Vdc when off and 500 mA. These are maximum ratings. A device that operates at 200 mA may destroy the output due to inrush current if that current exceeds 500 mA (e.g. an incandescent light). The inductive "kick" (back EMF from a collapsing magnetic field) when a relay is released can impose a voltage higher than 30V and destroy the output transistor (use a backwards diode to clamp the back EMF). 18 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Figure 17 — Input from Sourcing Contact Figure 17 shows the switch on the high side with the low side grounded. As this is a "Dry" contact (the current is limited to 15 mA) a high quality sealed switch should be used. Figure 18 — Input from Sinking Contact Figure 18 shows a switch connected on the low side with the high side connected to the positive supply. This also requires a high quality sealed contact. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 19 Figure 19 — Input from NPN Sensor Figure 19 shows an Open Collector NPN output from a photosensor switching to ground. It can be wired as a sinking or low-side contact. Figure 20 — Input from PNP Sensor Figure 20 shows an Open Collector PNP output from a photosensor switches to the positive supply. It can be wired as a sourcing or high-side contact. 20 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Figure 21 — Sourcing Output "Contact" Figure 21 shows a relay connected as a current sourcing "Contact." The relay is grounded and the +OUT terminal goes to the positive supply. The diode across the relay coil is essential to protect the output circuit and reduce noise along the wiring. It should be connected at the relay to minimize the length of wiring that could radiate noise. A 1N4001 or similar diode may be used. Figure 22 — Sinking Output "Contact" Figure 22 shows a "Contact" sinking current from a relay, the -OUT terminal is grounded and the relay goes to the positive supply. This configuration must also have a diode across the relay coil to protect the circuit and reduce noise. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 21 Figure 23 — Sinking Output LED Driver In Figure 23, the LED and current limiting resistor are in series between the positive supply and the +OUT terminal. The -OUT terminal is grounded. The resistor in series with the LED sets the forward current. 1.2K will provide 20 mA LED current when run from 24 Vdc. Figure 24 — Output to TTL or CMOS In Figure 24 the output acts as an Open Collector. This will provide a TTL or CMOS compatible signal when a 1K to 10K pull-up to +5 Vdc (the logic supply) is used. 22 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 3.8 Power Requirement The LRP820 power supply requirements are: 18 to 30Vdc 31Watts maximum consumption The maximum current consumption at 24Vdc is 1.3 A. Power Options There are three options for powering the LRP820: Powered from the MUX32 bus (default) This is the default configuration for powering the LRP820. If the power available over your MUX32 network is not sufficient to power the LRP820, use one of the following methods. Powered via the external power connector This is how you must power the LRP820 if you are not connecting the LRP820 to a MUX32 network. Powered from an external power supply and isolated MUX32 bus power (isolated mode) When the LRP is powered from both sources, the LRP820 will be opto-isolated from the MUX32 bus. The MUX32 interface board will draw 2.5 mA at 24 Vdc from the MUX32 bus when the LRP820 is powered with this method. Power to the external power connector should conform to the specifications given above. If you choose to power the LRP820 with an external supply via the power connector, you must open the LRP820 and changed jumper and cable locations. The following sections describe how to make these changes. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 23 Power from the MUX32 Bus By default, the LRP820 is configured to run with power supplied by the network. In this mode, there is no galvanic isolation between the MUX32 wires and the LRP820, and there is no need for a separate power supply. If you choose to power the LRP820 form the MUX32 bus, you do not need to make any internal changes to cables and jumpers. Wire power according to the pinouts given for the MUX32 connector in Figure 14, page 16. Power via the external supply connector The LRP820 contains components sensitive to electro-static discharge. Take proper grounding precautions before opening the LRP820. To change the LRP820 to run in isolated mode: 1. Open the LPR820 by loosening the four captive screws that secure the cover. 2. Refer to Figure 25 and then move the power cable, labeled assembly 10-3110, from connector J7 to J9. 3. The MUX32 cable, labeled assembly 10-3111, must then exchange places with the power cable, moving from J9 to J7. Figure 25 — Power Cable Connectors J7 and J9 24 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 4. Referring to Figure 26, locate jumper J1 and move the shunt from pins 4 and 3 to pins 2 and 1. 5. Close the LRP820 and connect a separate +24V power supply to the external power connector shown in Figure 12, page 15. Figure 26 — Power Jumper Position for External Powering Only Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 25 Power from the MUX32 bus and from an external power supply When the LRP is powered from both sources, the LRP820 will be opto-isolated from the MUX32 bus. The LRP820 contains components sensitive to electro-static discharge. Take proper grounding precautions before opening the LRP820. To power the LRP820 from an external supply and the MUX32 bus: 1. Open the LPR820 by loosening the four captive screws that secure the cover. 2. Refer to Figure 25 and then move the power cable, labeled assembly 10-3110, from connector J7 to J9. 3. The MUX32 cable, labeled assembly 10-3111, must then exchange places with the power cable, moving from J9 to J7. 4. Make sure that the jumper on J1of the MUX32 Interface Board connects pins 3 and 4, and then close the LRP820. 5. Connect a separate +24V power supply to the external power connector shown in Figure 12, page 15. 6. Wire the MUX32 interface and power according to the pinouts given for the MUX32 connector in Figure 14, page 16. 26 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 3.9 LED Indicators The LRP820 has 16 LEDs indicating status of the LRP820 Reader/Writer, interface communications, and I/O status. Figure 27 — LRP820 Front with LEDs Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 27 Table 4 shows these LEDs and their meaning. Table 4 — LED Indicators LED Color Indicates PWR red The LRP820 is receiving power RF green RF Data Transfer ANT red Antenna On and tag in field ERROR Red Unsuccessful RF command (.5 sec. flash) Entering Download Mode via DIP switch 5 (4 flashes) CONFIG green Successful RF command - 1 .5 sec. flash ERROR + green/red CONFIG Entering Operating Mode - 4 alternate flashes Configuration Mode initiated (CTRL-D) - Both LEDS flash 4 times Configuration Mode initiated (CTRL-E) - Both LEDS flash 2 times IN-A yellow Input active IN-B yellow Input active IN-C yellow Input active IN-D yellow Input active COM1 green/red Incoming data (RX): red Outgoing data (TX): green COM2 green/red Incoming data (RX): red Outgoing data (TX): green MUX32 red Data transfer (RX/TX): red OUT-A green Output active OUT-B green Output active OUT-C green Output active OUT-D green Output active Additional LED behavior may be observed during certain commands and conditions. This behavior will be indicated as appropriate elsewhere in this manual. 28 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 4 SERIAL AND BUS COMMUNICATIONS 4.1 Serial Interfaces The LRP820 has RS232 and RS422 available on the COM1 serial port. COM2 is configured for RS232 communications and is reserved for downloading programs to the LRP820 and for setting up the configuration parameters. Both RS232 and RS422 interfaces are opto-isolated. The RS422 interface is specially suitable for long cable, noisy environment links. The specification for the COM1 interface follows: Baud rate: 1200, 2400, 4800, 9600, 19200, 38400 bps Data: 7, 8 Parity: Even, Odd, None Handshake: None, Xon/Xoff The specification for the COM2 interface follows: Baud rate: 1200, 2400, 4800, 9600, 19200 bps Data: 7, 8 Parity: Even, Odd, None Handshake: None, Xon/Xoff Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 29 Digital Board DIP Switch The digital board is mounted inside the top of the LRP820 enclosure. The first 5 switches of the main board sets the COM1 baud rate, electrical interface, and the download options for COM2. Switches 6, 7 and 8 are not used and should remain OFF. When switch 1 and 2 are both set ON, the baud rate is set via the Configuration Menu. Figure 28 — Digital Board with DIP Switch NOTE: When you set switch 5 ON to enable download, the default parameters will first be restored and saved to the non-volatile memory. The baud rate configuration on the main board only applies to the RS232 and RS422 serial interfaces. When a Bus Interface (MUX32) is selected, the baud rate is set by the Interface Board DIP switches. 30 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer NOTE: DIP switch 4 must be in the default ON position for the MUX32 interface to function. Table 5 Main Board DIP Switch Settings Baud rate Download/ Restore Defaults Interface SW 2 SW 3 SW 4 SW 5 Settings 9600 ON ON 19200 ON 38400 ON Set from Configuration Menu RS232 ON ON RS422 ON MUX32 ON Reserved Disabled ON Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Enabled Download/ Restore defaults 31 4.2 Bus Interfaces The COM1 serial port, beside the RS232 or RS422 options, can be configured as a MUX32 interface. The following MUX32 bus parameters are set by the DIP switches found on the Interface Board. Bus Rate: 9600, 346Kbps MUX32 Slave Address Figure 29 — MUX32 Interface Board DIP Switch 32 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer MUX32 Interface Board DIP Switch S1 is an eight position DIP switch. Switches 1 to 6 set the MUX32 slave address, switches 6 and 7 are reserved and switch 8 sets the bus rate. Table 6 shows these settings. Table 6 — MUX32 DIP Switch Settings MUX32 Address SW 1 SW 2 SW 3 ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON Reserved Bus Rate SW 4 SW 5 SW 6 SW 7 SW 8 Switches 6 and 7 are not used - leave in the OFF position ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF ON Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Setting MUX Addr. 0 MUX Addr. 1 MUX Addr. 2 MUX Addr. 3 MUX Addr. 4 MUX Addr. 5 MUX Addr. 6 MUX Addr. 7 MUX Addr. 8 MUX Addr. 9 MUX Addr. 10 MUX Addr. 11 MUX Addr. 12 MUX Addr. 13 MUX Addr. 14 MUX Addr. 15 MUX Addr. 16 MUX Addr. 17 MUX Addr. 18 MUX Addr. 19 MUX Addr. 20 MUX Addr. 21 MUX Addr. 22 MUX Addr. 23 MUX Addr. 24 MUX Addr. 25 MUX Addr. 26 MUX Addr. 27 MUX Addr. 28 MUX Addr. 29 MUX Addr. 30 MUX Addr. 31 9600 bps 346K bps 33 5 MENU CONFIGURATION The LRP820 feature a menu-driven program designed to give convenient access to the serial parameters, restore defaults or change operating modes. 5.1 How to Enter Menu Configuration Begin by connecting the COM2 port to your PC host (see table below) and running EC that is available on the diskette or from Escort Memory Systems’ Web site at www.ems-rfid.com. LRP820 Standard PC Serial Port COM2 Pin Number Signal Name DB9 Pin Number Signal Name TX RX RX TX GND GND Set the serial parameters to the LRP820 default settings or the last known state of COM2. The default settings for COM2 are as follows: Baud 9600 Parity None Data bits Stop bits Flow control None If you can not establish communications with COM2, do the following to restore the default values. 1. Place DIP switch five in the ON position and cycle power to the LRP820 or press the reset switch. This will load the default values. 2. Place DIP switch 5 in the OFF position and cycle power once more. Please refer to Chapter 4, Serial and Bus Communications for more information on the serial interface. 34 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer To enter the Main Board configuration menu, cycle power or press the reset switch, and then press CTRL-D within the first seven seconds of the initialization. The LRP820 will enter the Configuration Menu. As the LRP820 starts the Configuration program, both the RF and CONFIG LEDs will flash. The Main Board Configuration menu will display with the current main board software version number together with the DSP firmware version. ****************************************************** LRP820 Standard Program Software V1.7C, June 2000 DSP Firmware V1.7B, June 2000 ******************************************************* [1] Set-up Operating Parameters [2] Download New Program [3] Download DSP Firmware [4] Exit to Operating Mode Enter Selection: 5.2 Set-up Operating Parameters To change the operating parameters of the LRP820, enter 1 at the initial menu. The following menu will be displayed, listing the current settings: The exact appearance of the menu display will depend on the settings you have made, and will be updated when you save your changes. Serial Port COM1: RS232, 9600, N, 8, 1, No handshake (DIP switches) Serial Port COM2: RS232, 9600, N, 8, 1, No handshake Operating Mode: ABx Standard RF Communication: Fast Mode [1] Set COM1 Parameters [2] Set COM2 Parameters [3] Set Operating Mode [4] Set RF Communications [5] Restore Factory Defaults [6] Return to Main Menu Enter Selection: Enter the number of the sub-menu you wish to enter. When you have made your selection you will be prompted to save your changes to the non-volatile EEPROM. For the new settings to take effect, you must save your changes to the EEPROM and reset the LRP820. If you do not save changes to the EEPROM, the new settings will be effective only until the LRP820 is reset. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 35 The following sub-menus are presented here in their entirety. Actually the menus will presented one option at time, advancing as you enter selections. Some options shown are dependent on earlier selections. Set COM1 Parameters Selecting 1 from the above menu will present the following display for the COM1 parameters. These settings are valid only if you are not using the DeviceNet Interfaces (e.g. DIP switch 4 is in the OFF position). Enter the appropriate number at each prompt. The default values are indicated by an asterisk (*). *** Set COM1 Parameters *** Baud Rate? [0] 1200 [1] 2400 [2] 4800 [3] 9600* [4] 19200 [5] 38400 Data size? [0] 7 bit [1] 8 bit* Parity? [0] None* [1] Even [2] Odd Handshake? [0] None* [1] Xon/Xoff Save Changes to EEPROM? [0] No [1] Yes Set COM2 Parameters Selecting 2 from the above menu will bring to the following display for the COM2 parameters. Enter the appropriate number at each prompt. The default values are indicated by an asterisk. *** Set COM2 Parameters *** Baud Rate? [0] 1200 [1] 2400 [2] 4800 [3] 9600* [4] 19200 Data size? [0] 7 bit [1] 8 bit* Parity? [0] None* [1] Even [2] Odd Handshake? [0] None* [1] Xon/Xoff Save Changes to EEPROM? [0] No [1] Yes Set Operating Mode The Set Operating Mode menu allows you to choose the command protocol the LRP820 will use or configure it to automatically enter Continuous Read Mode upon start-up. 36 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer *** Set Operating Mode *** Command Protocol? [0] ABx Standard* [1] ABx Fast [2] ABx ASCII Checksum? [0] Disabled* [1] Enabled Power up in Continuous Read Mode? [0] NO [1] Single Tag [2] Multiple Tag Start Address (0 to 47) Length (1 to 48) Delay Between Duplicate Decodes (0 to 60) Raw Read Response? [0] NO [1] CR terminate [2] CR/LF terminate Save Changes to EEPROM? [0] No [1] Yes Command Protocol? The LRP820 offers three modes for the transfer of data and commands. ABx Standard (ABxS) uses only the LSB for tag data while ABx Fast (ABxF) will use both the MSB and the LSB for the passing of data. ABx ASCII (ABxA) mode permits RFID operations using seven bit data packets in the form of printable ASCII characters. Checksum? ABx Fast and ABx ASCII also permits you to include a checksum in the command. To use a checksum value with the ABx commands, you must enable the checksum option. It is recommended that you enable the checksum option. Power up in Continuous Read Mode? You also have the option of setting the LRP820 to start-up in Continuous Read Mode. When you have configured the LRP820 to function in this manner, you do not issue commands to the LRP820. It will, upon start-up, enter directly into a Continuous Read Mode. Since this bypasses the normal command parameters, you must specify the Continuous Read Mode parameters. The LRP820 will respond to other commands and resume Continuous Read Mode when completed. If you are using your LRP820 in this mode, you must choose if you want the LRP820 to read a single tag or read multiple tags within the field. To exit Continuous Read Mode you must either re-enter the configuration menu and select NO from the Power up in Continuous Read Mode option, or issue a Continuous Read command from the host with a read length of 0 as described in Chapter 6, RFID Interface. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 37 Start Address (0-47) Enter the tag address where you want the read to begin. Length (1-48) Enter the length of the read you wish the LRP820 to perform. Make certain that the length value does not exceed the number of possible addresses following the starting tag address. Entering a read length of 0 will disable Continuous Read Mode. Delay Between Identical Decodes (0-60) The Delay Between Identical Decodes parameters can have a value of 0 to 60 seconds. When the Delay Between Identical Decodes is set to 0, the LRP820 will continuously read AND transmit tag data to the host. This can flood the buffers and cause communication errors and data loss. Raw Read Response? If you have selected ABx Fast or ABx ASCII, you have the option of stripping the command protocol from the data and adding a terminator to separate the data packets. You can choose a CR (0DH) or CR/LF (0DH, 0AH) to terminate the data. Set RF Communication The LRP820 should be configured with the default (0) Fast Mode. *** Set RF Communication *** RF Communication? [0] Fast Mode* [1] Standard Mode 0 Save Changes to EEPROM? [0] No [1] Yes Restore Factory Defaults It is often helpful during troubleshooting to restore the LRP820 to known default values. To do so, select 1from this menu. *** Restore Factory Defaults *** Restore Factory Default? [0] No [1] Yes The restored defaults will be saved to the EEPROM. The communication defaults can also be restored by placing the main board DIP switch number 5 in the ON position and then restarting the LRP820. After you have saved any changes, you must re-initialize the LRP820 with switch 5 in the OFF position. 38 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Return to Main Menu When you have completed your configuration, entering 5 will return you to the initial menu. Unsaved changes will be effective until the LRP820 is reset. Saved changes will be loaded automatically the next time the LRP820 is reset. 5.3 Download New Program Before attempting to download new firmware to the LRP820 main board, read the instructions provided in a readme.txt file on the update diskette. When you select 2 from the Main Menu, the LRP820 will display information on the current program and prompt you to begin the download. *** Download New Program*** Program Size :21824 Bytes Program Checksum :5AE0H (OK) Free Program Memory :39600 Bytes Flash Write Counter :2 times Press a key to start Downloading After you have pressed a key, the LRP820 will display: Send the Intel Hex file. Downloading now. Send the new program file via your terminal emulation program in ASCII text or Hexadecimal format. Wait 10 seconds after the download is complete before resetting the LRP820. IMPORTANT: It is not necessary to download firmware into the unit unless instructed to do so by Escort Memory Systems technical support personnel. 5.4 Downloading DSP Firmware Before attempting to download new firmware to the LRP820 main board, read the instructions provided in a readme.txt file on the update diskette. When upgrading software in the controller the number and meaning of the configuration parameters may not match between the old and new software. The old settings may not be interpreted properly with the new software. BeCopyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 39 fore downloading another version of software, display and record the current configuration settings. Then download the new software version. Set switch 5 (on the main board) on and apply power to initialize the configuration parameters to their default states. When the LEDs stop flashing, turn Switch 5 to Off and press the reset switch. Enter the Configuration Menu and re-enter any non-default configuration parameters. When you select 3 from the Main Menu, the LRP820 will prompt you to begin the download. *** Download DSP Firmware*** Press a key to start Downloading After you have pressed a key, the LRP820 will display: Send the Intel Hex file. Downloading now. Send the new firmware via your terminal emulation program in ASCII text or Hexadecimal format. The firmware will be automatically transferred to the DSP Flash Memory. Wait 10 seconds after the download is complete before resetting the LRP820. Record: 750 Download OK File Transfer to DSP Blocco 24/24 DSP Flash Programming... New Firmware Transferred to DSP WARNING: Do not download INTERFACE BOARD firmware to the main board. IMPORTANT: It is not necessary to download firmware into the unit unless instructed to do so by Escort Memory Systems technical support personnel. 5.5 Exit to Operating Mode This option is available if you wish to use temporary, unsaved, configuration parameters. The unsaved options you have selected will be used until the LRP820 is reset and the saved parameters are restored. 40 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 6 RFID INTERFACE 6.1 Introduction The LRP820 offer three possible command protocols: ABx Standard, ABx Fast and ABx ASCII. The ABx Standard format is word-based and is compatible with most existing RFID systems by Escort Memory Systems. The ABx Fast protocol is a byte-based packet structure that permits command execution with fewer total bytes transferred. The ABx ASCII protocol is also a byte-based format that permits the execution of RFID commands using a seven-bit ASCII character set. The ABx Fast protocol is the most efficient and therefore recommended by Escort Memory Systems. Table 7 on page 39 lists the ABx commands available for the LRP820. The LRP820 command set is made of two subsets: the ‘Non-Anticollision’ commands and the ‘Anticollision’ commands. The Anticollision commands allow you to manage the multiple-tags-in-field capability of the LRP system. Command Timeout Most commands have a timeout value that is used to limit the time the LRP820 will attempt to complete the specified operation. This value is given in 1 ms increments with a maximum value of 65,534 ms (FFFEH). A timeout value of 0 will generate a syntax error. Between 500ms and 1000ms is recommended for a timeout value for single tag commands. Shorter timeouts may result in diminished range. A 30ms timeout value is the shortest allowable timeout and should only be used for short range, single tag command applications. Multiple tag commands will require longer timeout values. For time critical applications the timeout value should be tested to obtain the maximum performance value. A longer timeout value does not mean that the command will take any longer to execute if the tag being addressed is in the field, it only represents the period of time (in milliseconds) the unit will attempt to execute the command. If the tag is present, the response time to execute the command will be the same whether the timeout is 100ms or 10,000ms. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 41 Table 7 - ABx Command Set Listing Non-Anticollision Commands 04 Hex Fill Tag 05 Hex Block Read 06 Hex Block Write 07 Hex Read Tag Serial Number 08 Hex Tag Search 0D Hex Continuous Block Read 10 Hex Set Output 11 Hex Input Status Anticollision Commands 84 Hex Fill Tag All* 85 Hex Block Read All* 86 Hex Block Write All* 87 Hex Read Tag SN All* 88 Hex Tag Search All* 89 Hex EAS Set/Reset 8A Hex EAS Start/Stop 8D Hex Continuous Read All* 8E Hex Memory Lock All* 94 Hex SN Fill 95 Hex SN Block Read 96 Hex SN Block Write 97 Hex SN Block Read All* *These commands can not be used with a MUX32 interface. NOTE: The delay between the characters of the command packet the LRP820 cannot be longer than 200 ms. 42 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer MUX32 and Anticollision Limitations MUX32 does not support the following “All” commands in multiple tag-in-field mode (i.e. Anticollision Index is not 0): Command Number Command 84H Fill Tag All 85H Block Read All 86H Block Write All 87H Read Tag SN All 88H Tag Search All 8DH Continuous Read All 97H SN Block Read All The entire command set is available for point-to-point serial communications. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 43 6.2 ABx Error Codes Non-Anticollision Error Codes The LRP820 will return an error if it encounters a fault during operation. Table 8 lists the possible error codes in Hexadecimal format. Table 8 — Non-Anticollision Error Codes Error Code 04H 05H 06H 08H 21H Description Fill Operation has failed Block Read has failed Block Write has failed Search Tag Operation failed Input Command does not match pre-defined format (syntax error) Additionally there are internal DSP errors, F1H through F5H, for use by Escort Memory Systems technical support. ABx Standard ABxS error codes are returned in the LSB of the second register passed to the PLC. The format of the error response is shown below. MSB LSB Remarks AAH FFH Command Error 00H XXH Error Code FFH FFH Message Terminator A Block Write fail error message would appear as: AAFF 0006 FFFFH. 44 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABx Fast The format of the error response is shown below. Field Bytes Contents Header02H Response Size 00H 02H 02H Error Flag FFH Error Code XXH Checksum XXH Terminators 03H A Block Write fail error message would appear as: 0202 0002 FF06 F803H. ABx ASCII The format of the error response is shown below. Field # of ASCII characters Contents Header 02H Response Size Packet length in bytes excluding the header, response size, checksum and terminator bytes Error Flag FFH Error Code XXH - see Table 7 for details 02H Checksum XXH - optional checksum Terminators 03H In ABx ASCII format the response size is the number of hex values and not the number of ASCII characters used to represent the hex value. A Block Write fail error message would appear as an ASCII character string: 0002FF06F8 . In hexadecimal the commands appears as: 02H 02H 30H 30H 30H 32H 46H 46H 30H 36H 46H 38H 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 45 Anticollision Status Byte When the anticollision commands encounter a fault condition they indicate the error in a STATUS byte returned in the response. If any of the flag bits of the Status byte are set, then an error has occurred during command execution. The format of the response is in all other ways, the same as a successful response. The STATUS byte is defined as follows: Antenna Failure R/W Error Collisions Internal Error Timeout Verify Error Reserved Reserved Some of the error conditions are the same as found in the non-anticollision commands, some are new and relate only to the anticollision. If any of the flag bits of the returned Status are set, then that condition occurred during the command execution. Multiple conditions can occur in the same command. Antenna Failure R/W error Collision Internal Error Timeout Verify Error There is an error at the antenna Error during the tag memory access Collisions detected: more than one tag in the field answered to the LRP820 at the same time, meaning a higher Anticollision Index probably needs to be set Internal error in low-level firmware (contact Escort Memory Systems technical assistance) Timeout expired Set when re-read verification fails Syntax Errors Syntax errors (error code 21H) will be returned in the same format as described for the non-anticollision commands. 46 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 6.3 Anticollision Commands Family Interrogation The anticollision commands always have a Family ID and an Anticollision Index as parameters. These parameters manage the read/writes when multiple tags are in the same reading field. The Family ID and Anticollision Index can be used separately or together. If the Family ID is zero, that feature is disabled, if the Anticollision Index is zero, the multiple tag-in-field feature is disabled as well. If both the features are disabled, the commands operate exactly the same as the Non-Anticollision commands. Family ID The Family ID is a 1 byte field in the LRP tag memory at address 0. When the Family ID parameter is set to 0, the command is broadcast to all the tags in the field. On the other hand, if it is not equal to 0, only the tags with the specified Family ID in byte 0 will respond to the LRP820. This feature can help in implementing a multi-level organization of the tags, by permitting the selective reading of tags by Family ID. This gives faster access to the tags than by using Anticollision Index alone. As previously noted, Family ID and the Anticollision Index can be used together for increased efficiency. When using the Family ID feature, the first byte of tag memory is reserved, and thus only 47 bytes are allowed to be used. When the feature is disabled, 48 bytes are available for user data. For this reason, in the read and write commands, once the parameter Family ID is not equal to zero, the addresses can go from 1 to 47, and the size from 0 to 47. However, when the Family Code is zero, the addresses can start from 0, and the size can be up to 48. In order to initialize a tag with a chosen Family ID, byte 0 in the tag must be set to that value by means of a Block Write or a Block Write All command. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 47 Anticollision Index The Anticollision Index controls the tag reading algorithm to achieve the fastest reading speed for the number of tags expected in the reading field at any given moment. It can also disable the multiple tag-in-field feature. The Anticollision Index should be set in relation to the maximum number of tags possibly present in the reading field at one time. Setting the Anticollision Index higher increases the number of tags that will be expected to be read in the field. Lowering the Index speeds up the tag read operation. Selecting the Anticollision Index is therefore a tradeoff choice between the number of tags in the reading field, and the time required to read/write to them. Regardless of the index setting, ALL tags present will be read. The index simply makes the process more efficient. None of the Anticollision Index values will absolutely limit the number of tags that can be read by the LRP820. The following table can assist you in setting the Index value, but tests should be done to find the best value. The allowed values are from 0 to 7. Anticollision Index (*) anticollision disabled Max number of tags 1 (*) 2-4 4-8 8-16 16-32 32-64 64-128 >128 Some commands return or have as a parameter, the Serial Number (SN). The tag serial number is a unique read-only, 64 bit (8 bytes) code in the tag memory. SN commands can be used to selectively write to a specific tag, identified by the SN. Target tag can be identified with a previous SN read command. Note that the anticollision commands, except SN Block Write, SN Fill and Tag Search All, will return a response packet only after the timeout is expired. If the command has the Anticollision Index set to 0, then a response will be returned after the first successful operation. 48 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer The Anticollision Commands return a successful response whenever the operation has been successfully completed on at least 1 tag. They will return an Error Response when no tag, as permitted by the Family ID and Anticollision Index, can be found in the antenna field. Note also that all the start addresses, byte lengths and packet sizes are expressed in 2 byte words, in order to be compatible with the HMS commands and to allow future developments. 6.4 ABx ABx Standard Standard Protocol Protocol 6.3 The ABx standard is a binary protocol, word (2-byte) oriented, so the syntax table reports the Most Significant Byte (MSB) and the Least Significant Byte (LSB). In the serial transmission, the MSB is transmitted first. ABxS Command 4 (04H): Fill Tag DESCRIPTION Fill an RFID tag with a one byte value over multiple contiguous addresses. DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses. The fill function requires one data value byte, a starting address, and a fill length. It will then proceed to fill the tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. When Fill Length is set to 0, the LRP820 will write fill data from the start address to the end of the tag's memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. Field Remarks Command Command number in hex preceded by AAH Start Address The tag address where the fill will start Fill Length The number of tag addresses to be filled in bytes Timeout Timeout value given in 1 ms units (1EH - FFFEH) Data Value Byte The byte to be used as fill Message Terminator FFFFH Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 49 EXAMPLE Writes 'A' (41H) to the tag starting at address 0005H for the following next consecutive 10 bytes. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the configuration. Command from Host Response from LRP820 MSB AAH 00H 00H LSB 04H 05H 0AH MSB AAH FFH 07H 00H FFH D0H 41H FFH 50 Remarks Perform Command 4 Start Address = 0005H Fill Length= 10 bytes (000AH) Timeout value Data Value Byte = 41H Message Terminator LSB 04H FFH Remarks Command echo Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 5 (05H): Block Read DESCRIPTION Read a block of data from an RFID tag. DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The Block Read command consists of a start address and length, followed by the message terminator, FFFFH, as shown below. If the read range exceeds the last tag address, the LRP820 will return error message 21H, invalid format. The data read from the tag is returned in the LSB of the register, and the MSB is always 00H. Field Remarks Command Command number in hex preceded by AAH Start Address The tag address where the read will start Read Length The number of tag addresses to be read Timeout Timeout value given in 1 ms units (1EH - FFFEH) Message Terminator FFFFH Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 51 EXAMPLE: Reads 8 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Read. Command from Host Response from LRP820 MSB AAH 00H 00H LSB 05H 01H 08H MSB LSB AAH 05H Command echo 00H 52H Read Data 1 = 52H 00H 46H Read Data 2 = 46H 07H FFH D0H FFH 00H 49H Read Data 3 = 49H 00H 44H Read Data 4 = 44H 00H 20H Read Data 5 = 20H 00H 54H Read Data 6 = 54H 00H 61H Read Data 7 = 61H 00H 67H Read Data 8 = 67H FFH FFH Message Terminator 52 Remarks Perform Command 5 Start Address = 0001H Read Block Length = 8 bytes (0008H) Timeout Value Message Terminator Remarks Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 6 (06H): Block Write DESCRIPTION Write a block of data to an RFID tag. DISCUSSION This command is used to write segments of data to contiguous areas of tag memory. It is capable of transferring up to 48 bytes of data transferred from the Host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The Block Write command consists of a start address followed by the data stream to be written to the RFID tag. If the write range exceeds the last tag address, the LRP820 will return error message 21H, invalid format. The LRP820 will also return an error if the write length is 0. The data to be written to the tag is contained in the LSB of the register, and the MSB is always 00H. Field Remarks Command Command number in hex preceded by AAH Start Address The tag address where the write will start Write Length The number of tag addresses to be written to in bytes Timeout Timeout value given in 1 ms units (1EH - FFFEH) Write Data The data to be written Message Terminator FFFFH Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 53 EXAMPLE: Writes 4 bytes of data to the tag starting at address 0020H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Write. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB Remarks AAH 06H Perform Command 6 AAH 06H Command echo 00H 20H Start Address = 0020H FFH FFH Message Terminator 00H 04H Write Length = 4 bytes 07H D0H Timeout Value 00H 52H Write Data 1 = 52H 00H 46H Write Data 2 = 46H 00H 49H Write Data 3 = 49H 00H 44H Write Data 4 = 44H FFH FFH Message Terminator 54 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 7 (07H): Read Tag Serial Number DESCRIPTION This command retrieves the eight-byte tag serial number. DISCUSSION Each LRP tag has an unique (264 possible numbers) serial number. This number cannot be changed and is not part of the 48 available data bytes. The tag serial number will be returned in the LSB only, with the MSB as 00H. Field Remarks Command Command number in hex preceded by AAH Timeout Timeout value given in 1 ms units (1EH - FFFEH) Message Terminator FFFFH EXAMPLE: This example will wait until a tag is in range and then reads the 8-byte serial number. In this example the ID is 1E6E3DC200000000H in hexadecimal. Command from Host Response from LRP820 MSB Remarks MSB LSB LSB Remarks AAH 07H Perform Command 7 AAH 07H Command Echo 07H D0H Timeout 00H 1EH First SN byte FFH FFH Message Terminator 00H 6EH Second SN byte 00H 3DH Third SN byte 00H C2H Fourth SN byte 00H 00H Fifth SN byte 00H 00H Sixth SN byte 00H 00H Seventh SN byte 00H 00H Eighth SN byte FFH FFH Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 55 ABxS Command 8 (08H): Tag Search DESCRIPTION Check to see if there is an RFID tag in the LRP820 field. DISCUSSION This command will activate LRP820 to "look" for a tag in the RF field. If the LRP820 finds a tag it will return a command echo to the host. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. If no tag is present, it will return an error message. See Section 6.2 for more information on error codes. Field Remarks Command Command number in hex preceded by AAH Timeout Timeout value given in 1 ms units (1EH - FFFEH) Message Terminator FFFFH EXAMPLE Checks for an RFID tag in the RF field. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Tag Search. Command from Host Response from LRP820 MSB Remarks MSB LSB Remarks 08H Command echo FFH Message Terminator LSB AAH 08H Perform Command 8 AAH 07H D0H Timeout Value FFH FFH FFH Message Terminator 56 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command D (0DH): Continuous Block Read DESCRIPTION When in Continuous Block Read mode, the LRP820 sends block reads continuously to any tag in range of the antenna. When a tag enters the RF field, it is read and the data passed to the host computer. The LRP820 continues to read the tag but will not send the same data to the host until the tag has been outside the RF field for a specified time period. This Delay Between Identical Decodes parameter prevents redundant data transmissions when the LRP820 is in Continuous Block Read mode. DISCUSSION The initiate/cancel Continuous Block Read command contains three parameters: read length, start address, and delay between identical decodes. The read length parameter switches the mode. Any valid, non-zero length (1-48) will set the LRP820 into Continuous Block Read mode. A read length value of 00H will turn Continuous Block Mode off. The Delay Between Identical Decodes parameters can have a value of 0 to 60 seconds. When the Delay Between Identical Decodes is set to 0, the LRP820 will continuously read AND transmit tag data to the host. This can flood the buffers and cause communication errors and data loss. If the LRP820 receives other commands from the host, it will execute them and then resume Continuous Block Read mode. To exit Continuous Block Read mode, issue the command with a read length of 0. In Continuous Block Read mode, the LEDs will display as follows: LED Behavior ANT LED ON Description Assumes the Antenna is powered and functioning CONFIG LED BLINK Tag entered the RF field RF LED ON A tag has been read and is still in the field RF LED OFF A read tag has been out of range for the specified time Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 57 The command is formatted as follows. Field Remarks Command Command number in hex preceded by AAH Start Address 2 byte value for the start address in the tag Read Length 2 byte value for the block read length Delay Between Identical Decodes Time the tag must be out of the antenna range before the LRP820 will transmit data again from that tag. Value is expressed in 1 second units. Message Terminator FFFFH EXAMPLE This example places the LRP820 in Continuous Block Read mode and reads 8 bytes of data from the tag starting at address 0001H. A delay between identical reads of 2 seconds (0002H = 2 x 1 second increments) is set. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB Remarks AAH 0DH Perform Command D AAH 0DH Command echo 00H 01H Start address FFH FFH Message Terminator 00H 08H Read 8 bytes 00H 02H 2 second delay FFH FFH Message Terminator The LRP820 will first return an acknowledgment of the command followed by a response containing read data when a tag enters the antenna field. Response from LRP820 MSB LSB Remarks AAH 0DH Command echo 00H 52H Read data byte 1 00H 46H Read data byte 2 00H 49H Read data byte 3 00H 44H Read data byte 4 00H 41H Read data byte 5 00H 20H Read data byte 6 00H 54H Read data byte 7 00H 61H Read data byte 8 FFH FFH Message Terminator 58 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer To exit Continuous Block Read mode, Send the command with the read length variable set to 0 as shown below. The value of the other variables are not considered. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB Remarks AAH 0DH Perform Command D AAH 0DH Command echo 00H 01H Start address FFH FFH Message Terminator 00H 00H Read 0 bytes/end mode 00H 02H 2 second delay FFH FFH Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 59 ABxS Command 10 (10H): Set Output DESCRIPTION Set the levels of the output lines and output LEDs "A" through "D." DISCUSSION This command uses bit logic to set the levels of the digital output lines. The four least significant bit toggle the output levels; 1 = ON and 0 = OFF. The following chart shows the hex values for all output high combinations. To reset all output, issue the command with 00H in the second word. MSB LSB Remarks LSB Bit 3 LSB Bit 2 LSB Bit 1 LSB Bit 0 Output D Output C Output B Output A 00H 00H Reset A, B, C, D 00H 01H Set Output A - Reset B, C, D 00H 02H Set Output B - Reset A, C, D 00H 03H Set Output A, B - Reset C, D 00H 04H Set Output C - Reset A, B, D 00H 05H Set Output A, C - Reset B, D 00H 06H Set Output B, C - Reset A, D 00H 07H Set Output A, B, C - Reset D 00H 08H Set Output D - Reset A, B, C 00H 09H Set Output A, D - Reset B, C 00H 0AH Set Output B, D - Reset A, C 00H 0BH Set Output A, B, D - Reset C 00H 0CH Set Output C, D - Reset A, B 00H 0DH Set Output A, C, D - Reset B 00H 0EH Set Output B, C, D - Reset A 00H 0FH Set Output A, B, C, D Field Remarks Command Command number in hex preceded by AAH Output Pattern Hex value for the bit output settings Message Terminator FFFFH 60 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE The following example sets Output B only and resets A, C, and D. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB Remarks AAH 10H Perform Command 10 AAH 10H Command echo 00H 02H Set Output B FFH FFH Message Terminator FFH FFH Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 61 ABxS Command 11 (11H): Input Status DESCRIPTION Retrieves the input line levels. DISCUSSION This command uses bit logic to monitor the levels of the digital input lines. The four least significant bits display the input levels; 1 = ON and 0 = OFF. The following chart shows the hex values for all input conditions that can be returned in the second word of the response. MSB LSB Remarks LSB Bit 3 Input D LSB Bit 2 Input C LSB Bit 1 Input B LSB Bit 0 Input A 00H 00H 00H 01H Inputs A, B, C, D, OFF Input A, ON - B, C, D, OFF 00H 00H 02H Input B, ON - A, C, D, OFF 03H Input A, B, ON - C, D, OFF 00H 04H Input C, ON - A, B, D, OFF 00H 05H Input A, C, ON - B, D, OFF 00H 06H Input B, C, ON - A, D, OFF 00H 07H Input A, B, C, ON - D, OFF 00H 08H Input D, ON - A, B, C, OFF 00H 09H Input A, D, ON - B, C, OFF 00H 0AH Input B, D, ON - A, C, OFF 00H 0BH Input A, B, D, ON - C, OFF 00H 0CH Input C, D, ON - A, B, OFF 00H 0DH Input A, C, D, ON - B, OFF 00H 0EH Input B, C, D, ON - A, OFF 00H 0FH Input A, B, C, D, ON Field Remarks Command Command number in hex preceded by AAH Message Terminator FFFFH 62 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE The following example shows only Input B is ON. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB Remarks AAH 11H Perform Command 11 AAH 11H Command echo FFH FFH Message Terminator 00H 02H Input B ON FFH FFH Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 63 ABxS Command 84 (84H): Fill Tag All DESCRIPTION Fill all RFID tags-in-field or all tags in the same family with a one byte value over multiple contiguous addresses. DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses. All tags present in the antenna field with the specified Family ID will be affected by this command. The fill function requires one data value byte, a starting address, and a fill length. It will then proceed to fill the tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. The Fill Length must be set to a non-zero value (1-48). The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the Anticollision Index is not zero (multiple tag-in-field enabled), the LRP820 will return a response after the timeout expires. If the Anticollision Index is 0, a response is returned when a successful operation is performed on 1 tag or when the timeout has expired. When the timeout is set to 0, the LRP820 will return a syntax error. Field Remarks Command Command number in hex preceded by AAH Family Code Tag Family ID - 00H = all tags Anticollision index Number of tags expected in field Start Address The tag address where the fill will start Fill Length The number of tag addresses to be filled (1-48) Timeout Timeout value given in 1 ms units (1EH - FFFEH) Data Value Byte The byte to be used as fill Message Terminator FFFFH NOTE: This command can not be used over a MUX32 interface. 64 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer A response to a successful command will follow this form. Field Remarks Command Echo Command number in hex preceded by AAH Number of Tags filled Number of tags found in the field and filled Command Status One byte Error status Message Terminator FFFFH EXAMPLE Writes 'A' (41H) to all tags of family 01H, starting at tag address 0005H for the following next consecutive 40 bytes with four to eight tags expected in the field.. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Fill All Tag. The Anticollision Index is set to 2 so 4 to 8 tags will be expected. Four tags are successfully filled within the timeout. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB Remarks AAH 84H Perform Command 84 AAH 84H Command Echo 01H 02H Tag Family 01/ Index 2 04H 08H Ntag/Status 00H 05H Start Address FFH FFH Message Terminator 00H 28H Fill Length 07H D0H Timeout 00H 41H Fill byte FFH FFH Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 65 ABxS Command 85 (85H): Block Read All DESCRIPTION Read a block of data from all RFID tags-in-field or those with the specified Family ID. DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error message 21H. The Block Read All consists of Tag Family ID and an Anticollision Index, a start address and length, followed by a timeout value and the message terminator, FFFFH. If the read length exceeds the last tag address, the LRP820 will return a syntax error message 21H. The data read from the tag is returned in the LSB of the register, and the MSB is always 00H. A special termination packet (AAH FFH) is sent after the timeout expires. When the Anticollision Index is not zero (multiple tag-in-field enabled), the LRP820 will return a response after the timeout expires. If the Anticollision Index is 0, the command returns a response after the successful operation on one tag or when the timeout expires. No termination packet is sent when the Anticollision Index is set to 0. Field Remarks Command Command number in hex preceded by AAH Tag Family Tag Family ID - 00H = all tags Anticollision index Number of tags expected in field Start Address The tag address where the read will start Read Length The number of tag addresses to be read Timeout Timeout value given in 1 ms units (1EH - FFFEH) Message Terminator FFFFH NOTE: This command can not be used over a MUX32 interface. 66 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: Reads 4 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Read All. The Family ID byte is set to zero so all tags will be read. The Anticollision Index is set to 2, so 4 to 8 tags will be expected. Three tags respond with read data. Command from Host Response from LRP820 MSB Remarks MSB LSB Remarks 85H Command Echo/Tag 1 LSB AAH 85H Perform Command 85 AAH 00H 02H Tag Family 00/ Index 2 00H 30H Data byte 1/Tag 1 00H 01H Start Address 00H 31H Data byte 2/Tag 1 00H 04H Read Length 00H 32H Data byte 3/Tag 1 07H D0H Timeout 00H 33H Data byte 4/Tag 1 FFH FFH Message Terminator FFH FFH Terminator/ Tag 1 AAH 85H Command Echo/Tag 2 00H 40H Data byte 1/Tag 2 00H 41H Data byte 2/Tag 2 00H 42H Data byte 3/Tag 2 00H 43H Data byte 4/Tag 2 FFH FFH Terminator/ Tag 2 AAH 85H Command Echo/Tag 3 00H 34H Data byte 1/Tag 3 00H 35H Data byte 2/Tag 3 00H 36H Data byte 3/Tag 3 00H 37H Data byte 4/Tag 3 FFH FFH Terminator/ Tag 3 AAH FFH Termination Packet 03H 08H Ntag/Status FFH FFH Terminator Message Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 67 ABxS Command 86 (86H): Block Write All DESCRIPTION Write a block of data to all RFID tags or all tags with the same Family ID. DISCUSSION This command is used to write segments of data to contiguous areas of tag memory. It is capable of transferring up to 48 bytes of data transferred from the Host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The Block Write consists of a Tag Family ID and an Anticollision Index, start address followed by the data stream to be written to the RFID tag. If the write range exceeds the last tag address, the LRP820 will return error message 21H, invalid format. The data to be written to the tag is contained in the LSB of the register, and the MSB is always 00H. The LRP820 returns a response when the timeout expires. If the Anticollision Index is 0 the command returns a response after the successful operation on 1 tag, or when the timeout expires. Field Remarks Command Command number in hex preceded by AAH Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address The tag address where the write will start Write Length The number of tag addresses to be written to in bytes Timeout Timeout value given in 1 ms units (1EH - FFFEH) Write Data The data to be written (1-48 bytes) Message Terminator FFFFH NOTE: This command can not be used over a MUX32 interface. 68 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: Writes 4 bytes of data, starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Write. The Family ID byte is set to 2, so all tags with Family ID of 2 will be written to (four tags in this example). The Anticollision Index is set to 2, so 4 to 8 tags are expected in the field. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB Remarks AAH 86H Perform Command 86 AAH 86H Command Echo 02H 02H Tag Family/ Index 2 04H 08H Ntags/Status 00H 01H Start Address FFH FFH Message Terminator 00H 04H Write Length 07H D0H Timeout 00H 40H Data byte 1 00H 41H Data byte 2 00H 42H Data byte 3 00H 43H Data byte 4 FFH FFH Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 69 ABxS Command 87 (87H): Read Tag SN All DESCRIPTION This command retrieves the 8-byte tag serial number from all tags or those with the specified Family ID number. DISCUSSION Each LRP tag has an unique (264 possible numbers) serial number. This number cannot be changed and is not part of the 48 available data bytes. The tag serial number is returned in the LSB only, with the MSB as 00H. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. A special termination packet (starting with AAH FFH) is sent when the timeout expires. If the Anticollision Index is 0, a response is returned after successful operation to 1 tag or after the timeout has expired. No termination packet is sent after a successful operation when the Anticollision Index set to 0. Field Remarks Command Command number in hex preceded by AAH Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags-in-field expected Timeout Timeout value given in 1 ms units (1EH - FFFEH) Message Terminator FFFFH NOTE: This command can not be used over a MUX32 interface. 70 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: This example will read the 8-byte serial number from Tag Family 2. The Anticollision Index of 1 sets the number of expected tags at 2-4. In this example the ID for the found tag is 1E6E3CD200000000H in hexadecimal. Multiple tags will return a complete response packet for each tag. Command from Host Response from LRP820 MSB Remarks MSB LSB LSB Remarks AAH 87H Perform Command 87 AAH 87H Command Echo 01H 01H Family ID/ Index 1 00H 1EH First SN byte 07H D0H Timeout 00H 6EH Second SN byte FFH FFH Message Terminator 00H 3CH Third SN byte 00H D2H Fourth SN byte 00H 00H Fifth SN byte 00H 00H Sixth SN byte 00H 00H Seventh SN byte 00H 00H Eighth SN byte FFH FFH Message Terminator AAH FFH Termination packet 01H 08H Ntags/Status FFH FFH Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 71 ABxS Command 88 (88H): Tag Search All DESCRIPTION Check to see if there is an RFID tag in the LRP820 field. DISCUSSION This command will activate LRP820 to "look" for a tag in the RF field. As soon as the LRP820 finds a tag it will return a command echo to the host. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. If no tag is present, it will return an error message. See Section 6.2 for more information on error codes. The number of tags returned can be either 1 (tag found) or 0 (timeout expired without having found a tag). Field Remarks Command Command number in hex preceded by AAH Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Timeout Timeout value given in 1 ms units (1EH - FFFEH) Message Terminator FFFFH NOTE: This command can not be used over a MUX32 interface. EXAMPLE Checks for an RFID tag in the RF field. A timeout of 1 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Tag Search. The Family ID is set for any tag, and the Anticollision Index is set to expect 2-4 tags. One tag is found and the command is successful. Command from Host Response from LRP820 MSB LSB Remarks MSB AAH 88H Perform Command 88 AAH 88H Command Echo 00H 01H Family ID/Anticollision Index 1 01H 00H Ntags/Status 07H D0H 2 second Timeout FFH FFH Message Terminator FFH FFH Message Terminator 72 LSB Remarks Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 89 (89H): EAS Set/Reset All DESCRIPTION Sets or resets the EAS feature in tag memory for all tags in range, and of the specified Family, when the command is issued. DESCRIPTION The commands contains a 1 byte parameter that enables or Disables the EAS feature in tags that receive the command. When the EAS Set/Reset All command is issued, the LRP820 responds with the number of tags affected (Ntag). If the LRP820 returns a 0 for Ntag, no tags were set or reset by the command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. When multiple tag-in-field is enabled (Anticollision Index is not 0), the LRP820 will return a response when the timeout period expires. When multiple tag-in-field is disabled, the LRP820 will return a response when it reads a tag or the timeout expires. Field Remarks Command Command number in hex preceded by AAH Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Timeout Timeout value given in 1 ms units (1EH - FFFEH) Set/Reset 1 = enable, 0 = disable Message Terminator FFFFH Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 73 EXAMPLE This example assumes that the tags-in-field are not enabled for the EAS feature. It will enabled the EAS feature for tags with Family ID 09H. The Anticollision Index is 2, so 4-8 tags are expected in the field. When the command is issued, 5 tags with Family ID 09H are found and enabled for EAS. Command from Host Response from LRP820 MSB Remarks MSB LSB LSB Remarks AAH 89H Perform Command 89 AAH 89H Command Echo 09H 02H Family ID/Anticollision Index 2 05H 08H Ntags/Status 07H D0H Timeout FFH FFH Message Terminator 00H 01H Enable EAS FFH FFH Message Terminator 74 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 8A (8AH): EAS Start/Stop DESCRIPTION If are using the EAS feature in your application, the EAS Start/Stop command enters and exits the LRP820 from EAS mode. DISCUSSION When EAS mode has been started, the LRP820 will return a response when one or more EAS-enabled tags have entered the antenna field. It will send a second response when all EAS-enabled tags have exited the field. The command contains a control byte that toggles EAS: 1 = start, 0 = stop. A Family ID can be set so that only EAS-enabled tags from the specified Family trigger EAS responses. The Anticollision Index is ignored and should be set to 00H for this command. The EAS mode also controls the CONFIG, ERROR and RF LEDs. The following table explains LED behavior. LED(s) Behavior Description CONFIG, ERROR, RF LED OFF No EAS-enabled tag in field CONFIG LED BLINK EAS-enabled tag entered field. RF LED ON EAS tag has been read. LED will remain ON until all EAS tags have left the field. ERROR LED BLINKS Last EAS tag left the field. IMPORTANT: EAS mode prevents any other commands from being acknowledged or executed until EAS has been stopped. Field Remarks Command Command number in hex preceded by AAH Family ID Tag Family ID - 00H = all tags Start/Stop 1 = start, 0 = stop Message Terminator FFFFH Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 75 EXAMPLE This example starts EAS mode. Three responses follow. The first is a command acknowledgment. The LRP820 sends the second when the first EAS-enabled tag enters the field, A third response is sent when field is clear of EAS-enabled tags. Family ID is set to 0 so that any EAS-enabled tag will trigger responses. Command from Host ACT Response from LRP820 MSB Remarks MSB LSB LSB Remarks AAH 8AH Perform Command 8A AAH 8AH Command Echo 00H 00H Family ID/null byte FFH 00H Ntag/Status 00H 01H Start/Stop FFH FFH Message Terminator FFH FFH Message Terminator When an EAS-enabled tag enters the antennas’ field, the LRP820 responds with an EAS tag-in-field response. Tags-in-Field Response from LRP820 MSB LSB Remarks AAH 8AH Command Echo 01H 00H Ntag/Status FFH FFH Message Terminator When all EAS-enabled tags have left the field, the LRP820 will send the following response. EAS Tags Left Field Response from LRP820 MSB LSB AAH 8AH Command Echo 00H 00H Ntag/Status FFH FFH Message Terminator 76 Remarks Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 8D (8DH): Continuous Read All DESCRIPTION Starts and stops Continuous Read All mode for multiple tags. DISCUSSION Continuous Read All mode is set by the length byte. To start Continuous Read All mode send the command with valid, non-zero value for the length of the read (1-48). Stop the mode by sending the command with a read length of 0. While in this mode, any other command can be issued and it will be handled properly. After processing the new command, the LRP820 will resume the Continuous Read All mode. The command has a parameter, tag delay, that can prevent multiple reads of the same tag. A tag is not read a second time until a specified number of tags have been read since it was last read. Allowed value are from 0 to 255 (FFH), where 0 means the tag can be re-read anytime. When Continuous Read All mode is interrupted with other commands, the tag delay count is stopped during execution of the other commands and then resumed. The LRP820 will respond with an acknowledge packet followed by data packets for each tag read. CONFIG LED blinks after each packet transmission. Field Remarks Command Command number in hex preceded by AAH Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address Tag address for the start of the read Read Length 1-48 = start, 0 = stop Tag Delay Number of tag that must be read before the same tag will be read again (0-255) Message Terminator FFFFH NOTE: This command can not be used over a MUX32 interface. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 77 EXAMPLE Reads 4 bytes of data from the tag starting at address 0001H. The Family ID byte is set to zero so all tags will be read. The Anticollision Index is set to 2 so 4 to 8 tags will be expected. The Tag Delay is set to 20 (14H). Three tags respond with read data. Command from Host ACK Response from LRP820 MSB Remarks MSB LSB Remarks LSB AAH 8DH Perform Command 8D AAH 8DH Command Echo 00H 02H Tag Family 00/ Index 2 FFH FFH Message Terminator 00H 01H Start Address 00H 04H Read Length 00H 14H Tag Delay FFH FFH Message Terminator After the LRP820 sends the acknowledgment, it will send the read data from the 3 tags. Data response from LRP820 MSB LSB AAH 8DH Command Echo/Tag 1 00H 30H Data byte 1/Tag 1 00H 31H Data byte 2/Tag 1 00H 32H Data byte 3/Tag 1 00H 33H Data byte 4/Tag 1 FFH FFH Terminator/ Tag 1 AAH 8DH Command Echo/Tag 2 00H 40H Data byte 1/Tag 2 00H 41H Data byte 2/Tag 2 00H 42H Data byte 3/Tag 2 00H 43H Data byte 4/Tag 2 FFH FFH Terminator/ Tag 2 AAH 8DH Command Echo/Tag 3 00H 34H Data byte 1/Tag 3 00H 35H Data byte 2/Tag 3 00H 36H Data byte 3/Tag 3 00H 37H Data byte 4/Tag 3 FFH FFH Terminator/ Tag 3 78 Remarks Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 8E (8EH): Memory Lock All DESCRIPTION This command “locks” tag addresses in four byte blocks. Once bytes are locked, they can not be unlocked. DISCUSSION The memory can be locked only in 4-byte blocks. The command passes a two byte word with bits assigned to 4-byte blocks that can be locked. Remaining bits can lock the EAS feature and the lock configuration itself. When multiple tag-in-field is enabled (Anticollision Index is not 0), the LRP820 will return a response when the timeout period expires. When multiple tag-in-field is disabled, the LRP820 will return a response when it locks bytes or the timeout expires. Attempting to write to locked bytes will return a write timeout error in the status byte. If you write to addresses that contain both locked and non-locked bytes, the LRP820 will return a write error in the status byte. The configuration word formatted as shown below. Byte LockLSB LockMSB Bit Description Tag bytes 0-3 Tag bytes 4-7 Tag bytes 8-11 Tag bytes 12-15 Tag bytes 16-19 Tag bytes 20-23 Tag bytes 24-27 Tag bytes 28-31 Tag bytes 32-35 Tag bytes 36-39 10 Tag bytes 40-43 11 Tag bytes 44-47 12 Lock Configuration 13 Lock EAS feature 14 Reserved 15 Reserved Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 79 If a bit in the configuration word is set, then the corresponding block in the tag is locked when the command is issued. If a bit in the configuration word is cleared (0), then the corresponding block will not change. Once locked, a block can not be unlocked. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The command is formatted as shown below. Field Remarks Command Command number in hex preceded by AAH Family Code Tag Family ID - 00H = all tags Anticollision index Number of tags-in-field expected Timeout Timeout value given in 1 ms units (1EH - FFFEH) LockMSB Bits 8-15 of the configuration word LockLSB Bits 0-7 of the configuration word Message Terminator FFFFH EXAMPLE This example will lock bytes 0-3 on all tags-in-field with the Family ID of 02H. Two tags are found and locked. Command from Host Response from LRP820 MSB Remarks MSB LSB Remarks LSB AAH 8EH Perform Command 8E AAH 8EH Command Echo 02H 01H Family ID/anticollision Index 02H 08H Ntag/Status 07H D0H 2 second timeout FFH FFH Message Terminator 00H 01H Lock Configuration FFH FFH Message Terminator 80 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 94 (94H): SN Fill DESCRIPTION Fills only the RFID tag specified by serial number with a one byte value over multiple contiguous addresses. DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses. Only the tag with the specified serial number will be affected by this command. The LRP820 will return a response after the successful fill operation or when the timeout expires. The fill function requires a Family ID and an Anticollision Index, one data value byte, a starting address, and a fill length. Then the command lists the serial numbers of the tag to be filled. It fills the specified tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. When Fill Length is set to 0, the LRP820 will write fill data from the start address to the end of the tags memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. It returns a response when done or when the timeout expires. Field Remarks Command Command number in hex preceded by AAH Family Code Tag Family ID - 00H = all tags Anticollision index Number of tags-in-field expected Start Address The tag address where the fill will start Fill Length The number of tag addresses to be filled Timeout Timeout value given in 1 ms units (1EH - FFFEH) Tag Serial Number The 8-byte serial number Data Value Byte The byte used to fill Message Terminator FFFFH Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 81 A response to a successful command will follow this form. Field Remarks Command Echo Command number in hex preceded by AAH Number of Tags filled 0 = tag not found, 1 = tag filled Command Status One byte Error status Message Terminator FFFFH EXAMPLE Writes 'A' (41H) to a single tag, starting at tag address 0005H for the following next consecutive 40 bytes. The Family ID is turned off and the Anticollision Index is set to expect 2-4 tags. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the configuration. Command from Host Response from Host MSB LSB Remarks MSB LSB Remarks AAH 94H Perform Command 94 AAH 94H Command Echo 00H 01H Family ID/ Index 1 01H 00H Ntag/Status 00H 05H Start Address FFH FFH Message Terminator 00H 28H Fill Length 07H D0H Timeout 00H 01H SN byte 1 00H ACH SN byte 2 00H 42H SN byte 3 00H D0H SN byte 4 00H 27H SN byte 5 00H 1CH SN byte 6 00H 65H SN byte 7 00H 33H SN byte 8 00H 41H Fill byte FFH FFH Message Terminator 82 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 95 (95H): SN Block Read DESCRIPTION Read a block of data from a specified RFID tag. DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command if there is no tag Family ID. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The SN Block Read consists of Family ID and an Anticollision Index, a start address and length, followed by a timeout value. The 8-byte serial number of the target tag is specified. If the read length exceeds the last tag address, the LRP820 will return error message in the status byte. It returns a response when done or when the timeout expires. The data read from the tag is returned in the LSB of the register, and the MSB is always 00H. A special error packet (AAH FFH) is sent if the timeout expires. Field Remarks Command Command number in hex preceded by AAH Tag Family Tag Family ID - 00H = all tags Anticollision index Number of tags expected Start Address The tag address where the read will start Read Length The numbers of tag addresses to be read Timeout Timeout value given in 1 ms units (1EH - FFFEH) Tag Serial Number 8-byte tag serial number Message Terminator FFFFH Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 83 EXAMPLE: Reads 4 bytes of data from the tag specified by serial number starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the SN Block Read. The Family ID byte is set to zero. The Anticollision Index is set to 2, expecting 4-8 tags in the field. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB AAH 95H Perform Command 95 AAH 95H Command Echo 00H 02H Tag Family 00/ Index 2 00H 30H Data byte 1 00H 01H Start Address 00H 31H Data byte 2 00H 04H Read Length 00H 32H Data byte 3 07H D0H Timeout 00H 33H Data byte 4 00H ABH SN byte 1 01H 00H Ntag/Status 00H 02H SN byte 2 FFH FFH Message Terminator 00H F3H SN byte 3 00H 55H SN byte 4 00H C5H SN byte 5 00H 2DH SN byte 6 00H 41H SN byte 7 00H A0H SN byte 8 FFH FFH Message Terminator 84 Remarks Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 96 (96H): SN Block Write DESCRIPTION Write a block of data to a single RFID tag specified by its serial number. DISCUSSION This command is used to write segments of data to contiguous areas of tag memory. It is capable of transferring up to 48 bytes of data transferred from the Host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The SN Block Write consists of a Family ID, Anticollision Index, and start address followed by the data stream to be written to the RFID tag. If the write range exceeds the last tag address, the LRP820 will return an error message 21H, invalid format. It returns a response when done or when the timeout expires. The data to be written to the tag is contained in the LSB of the register, and the MSB is always 00H. Field Remarks Command Command number in hex preceded by AAH Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address The tag address where the write will start Write Length The number of tag addresses to be written to Timeout Timeout value given in 1 ms units (1EH - FFFEH) Tag Serial Number 8-byte tag serial number Write Data The data to be written (1-48 bytes) Message Terminator FFFFH Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 85 EXAMPLE: Writes 4 bytes of data, starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Write. The Family ID byte is set to 0 and the Anticollision Index is set to 2 for this example, meaning the LRP820 will be expecting 4-8 tags in the field. Command from Host Response from LRP820 MSB Remarks MSB LSB Remarks 96H Command Echo LSB AAH 96H Perform Command 96 AAH 02H 02H Tag Family 02/ Index 2 01H 00H Ntags/Status 00H 01H Start Address FFH FFH Message Terminator 00H 04H Write Length 07H D0H Timeout 00H A4H SN byte 1 00H 6CH SN byte 2 00H 18H SN byte 3 00H 92H SN byte 4 00H 2DH SN byte 5 00H 34H SN byte 6 00H DEH SN byte 7 00H 20H SN byte 8 00H 40H Data byte 1 00H 41H Data byte 2 00H 42H Data byte 3 00H 43H Data byte 4 FFH FFH Message Terminator 86 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxS Command 97 (97H): SN Block Read All DESCRIPTION Read a block of data from all RFID tags-in-field or those with the specified Family ID. Returns the serial number of the tags read, along with tag data. DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command if there is no tag family ID. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The response to this command will contain the serial number of the responding tags preceding the data from those tags. The termination packet is transmitted when the timeout expires. Each packet will be sent to the host as soon as it is available. The returned serial numbers can be used to read/write to tags-in-field via the SN Block Read/Write command. The SN Block Read All consists of Family ID, Anticollision Index, a start address and length, followed by a timeout value and the message terminator, FFFFH. A special termination packet is sent when the timeout expires. If the Anticollision Index is 0, a response is returned when the operation is successfully completed on 1 tag, or when the timeout expires. A termination packet is not sent for successful completion if the Anticollision Index is 0. If the read length exceeds the last tag address, the LRP820 will return an invalid format error message (error code 21H). Field Remarks Command Command number in hex preceded by AAH Tag Family Tag Family ID - 00H = all tags Anticollision index Number of tags expected Start Address The tag address where the read will start Read Length The numbers of tag addresses to be read Timeout Timeout value given in 1 ms units (1EH - FFFEH) Message Terminator FFFFH NOTE: This command can not be used with a MUX32 interface. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 87 EXAMPLE: Reads 2 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the SN Block Read All. The Family ID byte is set to zero so all tags will be read. The Anticollision Index is set to 2 so 4-8 tags are expected. Two tags respond with read data. Command from Host Response from LRP820 MSB LSB Remarks MSB LSB Remarks AAH 97H Perform Command 97 AAH 97H Command Echo/Tag 1 00H 02H Tag Family 00/ Index 2 00H 10H SN byte 1/Tag 1 00H 01H Start Address 00H 43H SN byte 2/Tag 1 00H 02H Read Length 00H 6CH SN byte 3/Tag 1 07H D0H Timeout 00H 73H SN byte 4/Tag 1 FFH FFH Message Terminator 00H 92H SN byte 5/Tag 1 00H C0H SN byte 6/Tag 1 00H D6H SN byte 7/Tag 1 00H 54H SN byte 8/Tag 1 00H 30H Data byte 1/Tag 1 00H 31H Data byte 2/Tag 1 FFH FFH Terminator/ Tag 1 88 AAH 97H Command Echo/Tag 2 00H 08H SN byte 1/Tag 2 00H 0AH SN byte 2/Tag 2 00H 81H SN byte 3/Tag 2 00H 18H SN byte 4/Tag 2 00H 23H SN byte 5/Tag 2 00H CCH SN byte 6/Tag 2 00H D0H SN byte 7/Tag 2 00H EFH SN byte 8/Tag 2 00H 40H Data byte 1/Tag 2 00H 41H Data byte 2/Tag 2 FFH FFH Terminator/ Tag 2 AAH FFH Command end 02H 08H Ntags/Status FFH FFH Message Terminator Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 6.5 ABx ABx Fast Fast Protocol Protocol 6.4 The difference from the standard ABx are: The command/response packet contains the packet size You can include a checksum in the command The headers and terminator are ASCII characters Since ABx Fast is a binary protocol, the Xon/Xoff handshake cannot be used. ABx Command Packet Structure: The command protocol is based on the following minimal packet structure. The data field and the checksum may not be present depending on the command type and your checksum setting. Field Number of Bytes Content Header (02H, 02H) Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command Code Command (Data) variable command data/parameters (Checksum) Optional Checksum Terminator (03H) Following a successful operation, the LRP820 will respond with the following. The data field and the checksum may not be present depending on your checksum setting. Field Number of Bytes Content Header (02H, 02H) Response Size Packet length in bytes excluding the header, response size, checksum and terminator bytes. Command Echo Command (Data) variable response data (Checksum) Optional Checksum Terminator (03H) Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 89 If the LRP820 Reader/Writer encounters a fault it will respond with the following: Field Number of Bytes Content Header (02H, 02H) Response Size Packet length in bytes excluding the header, packet size, checksum and terminator bytes. Error Flag FFH Error Code Hex error code, see Table 7 for details (Checksum) Optional Checksum Terminator (03H) The Header and Terminator are always STX-STX and ETX respectively. All other bytes are interpreted as binary data (0 - 255 dec). Fields with two bytes are sent most significant byte (MSB) first. The sequence for each command is given with the response format in the following section. Command/Response Size The ABx Fast requires that the length of the packet be included in the command. All parameters and data between the Command/Response Size and the Checksum or Terminator bytes must be accounted for in the command/response size word. This includes all command codes and parameters such as field definitions for Block Read/Writes. The command/response size will be the same with, or without, a checksum. 90 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Checksum The optional checksum must be enabled from the operating mode menu to be available. The checksum is calculated by adding all the byte values in the packet (less the values in the header, checksum if present, and terminator), discarding byte overflow and subtracting the byte sum from FFH. Thus, when the packet length through the checksum are added as byte values, the sum will be FFH. EXAMPLE The following is a typical command using a checksum. Command from Host Field Contents Header 02H Command Size 00H 02H 03H Command Code Timeout Sum these values to calculate the checksum 01H 07H D0H Checksum 24H Terminators 03H The summed values begin with the Command Size and end with the timeout value. That sum, less overflow, is subtracted from FFH for the checksum value. Thus: 00 + 03 + 01 +07 + D0 = DB FF - DB = 24H The optional Checksum is included in the following command explanations. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 91 ABxF Command 4 (04H): Fill Tag DESCRIPTION Fill an RFID tag with a one byte value over multiple contiguous addresses. DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses. The fill function requires one data value byte, a starting address, and a fill length. It will fill the tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. When Fill Length is set to 0, the LRP820 will write fill data from the start address to the end of the tag’s memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. 0008H for this command Command 04H Start Address 2-byte value for the starting tag address Fill Length 2-byte value for the length of the fill in number of bytes Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Data value byte 1 byte of fill Checksum Optional Checksum Terminator A response to a successful command will follow this form. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command 04H Checksum Optional Checksum Terminator 92 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE Writes 'A' (41H) to the tag starting at address 0005H for the following next consecutive 40 bytes. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the configuration. Response from LRP820 Command from Host Field Contents Field Contents Header 02H Header 02H Command Size 00H Response Size 00H 04H 02H 02H 01H 08H Command Code 04H Command Echo Start address 00H Checksum FAH 05H Terminators 03H Block Size 00H 28H Timeout, 2 seconds 07H Data Value Byte 41H D0H Checksum AEH Terminators 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 93 ABxF Command 5 (05H): Block Read DESCRIPTION Reads a block of data from an RFID tag. DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The Block Read consists of a start address and length, followed by a timeout value and a message terminator as shown below. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. 0007H for this command Command 05H Start Address 2-byte value for the starting tag address Block Size 2-byte value for the length of the read in number of bytes Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Checksum Optional Checksum Terminator 94 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: Reads 4 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Read. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H 07H 02H 05H Command Code 05H Command Echo 05H Start address 00H Data from address 0001H 05H Data from address 0002H AAH Data from address 0003H E7H Data from address 0004H 0AH 01H Block size 00H 04H Timeout, 2 seconds 07H Checksum 17H Terminator 03H D0H Checksum 55H Terminator 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 95 ABxF Command 6 (06H): Block Write DESCRIPTION Write a block of data to an RFID tag. DISCUSSION The Block Write command is used to write segments of data to contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The Block Write command consists of a start address followed by the data to be written to the RFID tag. If the write range exceeds the last tag address, the LRP820 will return an invalid format error message (error code 21H). Field Content Header Packet Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. 0007H plus the number of data bytes Command 06H Start Address 2-byte value for the starting tag address Block Size 2-byte value for the length of the write in number of bytes Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Data Data bytes to be written Checksum Optional Checksum Terminator 96 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: Writes 4 bytes of data to the tag starting at address 0000H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Write. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H 0BH 02H 01H Command Code 06H Command Echo 06H Start address 00H Checksum F8H 00H Terminators 03H Block Size 00H 04H Timeout, 2 seconds 07H Data to write to address 0000H 52H Data to write to address 0001H 46H Data to write to address 0002H 49H Data to write to address 0003H 44H D0H Checksum EEH Terminators 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 97 ABxF Command 7 (07H): Read Tag Serial Number DESCRIPTION This command retrieves the 8-byte tag serial number. DISCUSSION Each LRP tag has an unique (264 possible numbers) serial number. This number can not be changed and is not part of the 48 available data bytes. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. 0003H for this command Command 07H Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH) Checksum Optional Checksum Terminator 98 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: This example will wait until a tag is in range and then reads the 8-byte serial number. In this example the ID is 1E6E3DC200000000 in hexadecimal. Response from LRP820 Command from Host Field Contents Field Contents Header 02H Header 02H Command Size 00H Response Size 00H 02H 02H 09H 03H Command Code 07H Command Echo 07H Timeout 07H First ID byte 1EH D0H Second ID byte 6EH Checksum 1EH Third ID byte 3DH Terminators 03H Fourth ID byte C2H Fifth ID byte 00H Sixth ID byte 00H Seventh ID byte 00H Eighth ID byte 00H Checksum 64H Terminators 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 99 ABxF Command 8 (08H): Tag Search DESCRIPTION Checks for an RFID tag in the LRP820 field. DISCUSSION This command will activate the reader/write to "look" for a tag in the RF field. If the LRP820 finds a tag it will return a command echo to the host. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. If no tag is present it will return an error message. See Section 6.2 for information on the error messages. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. 0003H for this command Command 08H Timeout 2-byte value for the time in 1 ms units (1EH - FFFEH) Checksum Optional Checksum Terminator EXAMPLE Checks for an RFID tag in the RF field. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Tag Search. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H Command Code 08H Command Echo Timeout 07H Checksum F6H D0H Terminators 03H 03H Checksum 1DH Terminators 03H 100 02H 01H 08H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxF Command D (0DH): Continuous Block Read DESCRIPTION Sends block reads continuously to any tag in range of the antenna. When a tag enters the RF field, it is read and the data passed to the host computer. The LRP820 continues to read the tag but will not send the same data to the host until the tag has been outside the RF field for a specified time period. This Delay Between Identical Decodes parameter prevents redundant data transmissions when the LRP820 is in Continuous Block Read mode. DISCUSSION The initiate/cancel Continuous Block Read command contains three parameters: read length, start address, and delay between identical decodes. The read length parameter switches the mode. Any valid, non-zero length will set the LRP820 into Continuous Block Read mode. A read length value of 00H will turn Continuous Block Mode off. The Delay Between Identical Decodes parameter can have a value of 0 to 60 seconds. When the Delay Between Identical Decodes is set to 0, the LRP820 will continuously read AND transmit tag data to the host. This can flood the buffers and cause communication errors and data loss. If the LRP820 receives other commands from the host, it will execute them and then resume Continuous Block Read mode. To exit Continuous Block Read mode, issue the command with a read length of 0. In Continuous Block Read mode, the LEDs will display as follows: LED Behavior Description ANT LED ON Assumes the Antenna is powered and functioning CONFIG LED BLINK Tag entered the RF field RF LED ON A tag has been read and is still in the field RF LED OFF A read tag has been out of range for the specified time Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 101 The command is formatted as follows. Field Content Header Command Size Command length in bytes excluding the header, command size, checksum and terminator bytes. Command 0DH Start Address 2 byte value for the start address in the tag Read Length 2 byte value for the block read length Delay Between Identical Delay value given in 1 second units Reads Checksum Optional Checksum Terminator EXAMPLE This example places the LRP820 in Continuous Block Read mode and reads 8 bytes of data from the tag starting at address 0001H. A delay between identical reads of 2 seconds (0002H = 2 x 1 second increments) is set. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H Command Code 0DH Command Echo 0DH Start Address 00H Checksum F1H 01H Terminator 03H 06H Read Length 02H 01H 00H 08H Delay Between Identical 02H Decodes Checksum E1H Terminator 03H 102 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer The LRP820 will first return an acknowledgment of the command followed by a response containing read data when a tag enters the antenna field. Response from LRP820 Field Contents Header 02H Command Size 00H Command Echo 0DH Data Byte 1 05H Data Byte 2 AAH Data Byte 3 E7H Data Byte 4 0AH Data Byte 5 05H Data Byte 6 AAH Data Byte 7 E7H Data byte 8 0AH Checksum A9H 02H 09H Terminator 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 103 ABxF Command 10 (10H): Set Output DESCRIPTION Set the levels of the output lines and output LEDs "A" through "D." DISCUSSION This command is used to set the levels of the digital output lines using bit logic. The four least significant bit toggle the output levels; 1 = ON and 0 = OFF. The following chart shows the hex values for all output high combinations. To reset all output, issue the command with 0000H for the Output Pattern byte. MSB LSB Remarks LSB Bit 3 LSB Bit 2 LSB Bit 1 LSB Bit 0 Output D Output C Output B Output A 00H 00H Reset A, B, C, D 00H 01H Set Output A - Reset B, C, D 00H 02H Set Output B - Reset A, C, D 00H 03H Set Output A, B - Reset C, D 00H 04H Set Output C - Reset A, B, D 00H 05H Set Output A, C - Reset B, D 00H 06H Set Output B, C - Reset A, D 00H 07H Set Output A, B, C - Reset D 00H 08H Set Output D - Reset A, B, C 00H 09H Set Output A, D - Reset B, C 00H 0AH Set Output B, D - Reset A, C 00H 0BH Set Output A, B, D - Reset C 00H 0CH Set Output C, D - Reset A, B 00H 0DH Set Output A, C, D - Reset B 00H 0EH Set Output B, C, D - Reset A 00H 0FH Set Output A, B, C, D Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command 10H Output Pattern 1 byte representing the desired output settings in bits 0-3 Checksum Optional Checksum Terminator 104 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE The following example sets Output B only and resets A, C, and D. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H Command Code 10H Command Echo 10H Output Value Byte 02H Checksum EEH Checksum EBH Terminator 03H Terminator 03H 02H 02H 01H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 105 ABxF Command 11 (11H): Input Status DESCRIPTION Retrieves the input line levels. DISCUSSION This command is used to monitor the levels of the digital input lines using bit logic. The four least significant bit toggle the input levels; 1 = ON and 0 = OFF. The following chart shows all possible conditions that can be returned in the response. MSB LSB Remarks LSB Bit 3 Input D LSB Bit 2 Input C LSB Bit 1 Input B LSB Bit 0 Input A 00H 00H Inputs A, B, C, D, OFF 00H 00H 01H Input A, ON - B, C, D, OFF 02H Input B, ON - A, C, D, OFF 00H 03H Input A, B, ON - C, D, OFF 00H 04H Input C, ON - A, B, D, OFF 00H 05H Input A, C, ON - B, D, OFF 00H 06H Input B, C, ON - A, D, OFF 00H 07H Input A, B, C, ON - D, OFF 00H 08H Input D, ON - A, B, C, OFF 00H 09H Input A, D, ON - B, C, OFF 00H 0AH Input B, D, ON - A, C, OFF 00H 0BH Input A, B, D, ON - C, OFF 00H 0CH Input C, D, ON - A, B, OFF 00H 0DH Input A, C, D, ON - B, OFF 00H 0EH Input B, C, D, ON - A, OFF 00H 0FH Input A, B, C, D, ON Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command 11H Checksum Optional Checksum Terminator 106 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE The following example shows only Input B is ON and A, C, and D are OFF. Command from Host Response from LRP820 Field Contents Field Contents Header 02H Header 02H Command Size 00H Response Size 00H 11H Command Echo 11H Checksum EDH Input Value Byte 02H Terminator 03H Checksum EAH Terminator 03H 02H 01H Command Code 02H 02H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 107 ABxF Command 84 (84H): Fill All DESCRIPTION Fill all RFID tags-in-field or all tags in the same family, with a one byte value over multiple contiguous addresses. DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses. All tags present in the antenna field with the specified Family ID will be affected by this command. The Fill All function requires one data value byte, a starting address, and a fill length. It will fill the tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. The Fill Length must be set to a non-zero value (1-48). The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the Anticollision Index is not zero (multiple tag-in-field enabled), the LRP820 returns a response after the timeout expires. If the Anticollision Index is 0, a response is returned when a successful operation is performed on 1 tag or when the timeout has expired. When the timeout is set to 0, the LRP820 will return a syntax error. Field Content Header Packet Size Packet length in bytes excluding the header, packet size, checksum and terminator bytes. 0008H for this command Command 84H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address 2-byte value for the starting tag address Fill Length 2-byte value for the length of the fill in number of bytes (1-48) Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Data value byte 1 byte of fill Checksum Optional Checksum Terminator NOTE: This command can not be used over a MUX32 interface. 108 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE Writes 'A' (41H) to all tags with Family ID 03H, starting at address 0005H for the following next consecutive 40 bytes. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the configuration. Four tags are found and filled successfully. Command from Host Response from LRP820 Field Bytes Contents Field Bytes Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H 0AH 02H 03H Command Code 84H Command Echo 84H Family ID 03H Numbers of tags 04H Anticollision Index 02H Status byte 08H Start address 00H Checksum 6CH 05H Terminator 03H Fill Length 00H 28H Timeout, 2 seconds 07H Data Value Byte 41H D0H Checksum 27H Terminator 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 109 ABxF Command 85 (85H): Block Read All DESCRIPTION Read a block of data from all RFID tags-in-field or all those with the specified Family ID. DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The Block Read All consists of a Family ID, an Anticollision Index, a start address and length, followed by a timeout value and a message terminator as shown below. If the read length exceeds the last tag address, the LRP820 will return an invalid format error message (error code 21H). A special termination packet is sent when the timeout expires. If the Anticollision Index is set to 0, a response is returned after successful completion of the operation to 1 tag, or when the timeout expires. When the Anticollision Index is 0, no special termination packet is sent after timeout. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command 85H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address 2-byte value for the starting tag address Block Size 2-byte value for the length of the read in number of bytes Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Checksum Optional Checksum Terminator NOTE: This command can not be used with a MUX32 interface. 110 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: Reads 4 bytes of data from tags with Family ID AAH, starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Read All. The Tag Family byte is set to zero so all tags will be read. The Anticollision Index is set to 2, expecting 4-8 tags. Two tags respond with data. Response from LRP820 Command from Host Contents Field Contents Header 02H Header 02H Command Size 00H Response Size 00H Field 02H 02H 03H 09H Command Code 85H Command Echo/Tag 1 85H Family ID AAH Data from address 0001H 05H Data from address 0002H AAH Checksum C8H Terminator 03H 02H Anticollision Index 02H Start address 00H 01H Block size 00H 02H Timeout, 2 seconds 07H Header D0H Checksum EBH Response Size 00H Terminator 03H Command Echo/Tag 2 85H Data from address 0001H 05H Data from address 0002H AAH 02H 03H Checksum C8H Terminator 03H Header 02H Response Size 00H Command Status FFH Number of tags 02H Status Byte 08H 02H 03H Checksum F3H Terminator 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 111 ABxF Command 86 (86H): Block Write All DESCRIPTION Write a block of data to an RFID tag. DISCUSSION The Block Write All command is used to write segments of data to contiguous areas of tag memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The Block Write All consists of a Family ID, Anticollision Index, a start address followed by the data stream to be written to the RFID tag. If the write range exceeds the last tag address, the LRP820 will return an invalid format error message (error code 21H). The LRP820 will return a response when the timeout expires. If the Anticollision Index is 0, a response is returned when the operation is successfully completed on 1 tag, or when the timeout expires. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. 0009H plus the number of data bytes Command 86H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address 2-byte value for the starting tag address Block Size 2-byte value for the length of the write in number of bytes Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Data Data bytes to be written Checksum Optional Checksum Terminator NOTE: This command can not be used over a MUX32 interface. 112 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: Writes 4 bytes of data to the tag starting at address 0000H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Write All. Family ID is set to 00H so all tags-in-field will be written to. The Anticollision Index is 4, expecting 32-64 tags. Five tags are written to. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H 0DH 02H 03H Command Code 86H Command Echo 86H Family ID 00H Number of Tags 05H Anticollision Index 04H Start address 00H Status Byte 08H 00H Checksum 69H 00H Terminator 03H Block Size 04H Timeout, 2 seconds 07H Data to write to address 0000H 52H Data to write to address 0001H 46H Data to write to address 0002H 49H Data to write to address 0003H 44H Checksum 68H Terminator 03H D0H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 113 ABxF Command 87 (87H): Read Tag SN All DESCRIPTION This command retrieves the 8-byte tag serial number from all tags-in-field or those with the specified Family ID. DISCUSSION Each LRP tag has an unique (264 possible numbers) serial number. This number can not be changed and is not part of the 48 available data bytes. A special termination packet is sent when the timeout expires. If the Anticollision Index is set to 0, a response is returned when the operation is successfully completed to 1 tag, or when the timeout expires. No special termination packet is sent upon successful completion if Anticollision Index is set to 0. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. 0005H for this command Command 87H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH) Checksum Optional Checksum Terminator NOTE: This command can not be used with a MUX32 interface. 114 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: This example will read the 8-byte serial number from all tags permitted by the Family ID and Anticollision Index. In this example, one tag responds and the serial number is 1E6E3DC200000000 in hexadecimal. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H 05H 02H 09H Command Code 87H Command Echo 87H Family ID 00H SN byte 1 1EH Anticollision Index 01H SN byte 2 6EH Timeout 07H SN byte 3 3DH D0H SN byte 4 C2H Checksum 9BH SN byte 5 00H Terminator 03H SN byte 6 00H SN byte 7 00H SN byte 8 00H Checksum E4H Terminator 03H Header 02H Response Size 00H 02H 03H Command Status FFH Number of Tags 01H Status Byte 08H Checksum F4H Terminator 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 115 ABxF Command 88 (88H): Tag Search All DESCRIPTION Check to see if there is any RFID tags in the LRP820 antenna field. DISCUSSION This command will activate the LRP820 to "look" for a tag in the RF field. As soon as the LRP820 finds a tag it will return a command echo to the host. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. If no tag is present it will return an error message. See Section 6.2 for information on the error messages. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. 0005H for this command Command 88H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Timeout 2-byte value for the time in 1 ms units (1EH - FFFEH) Checksum Optional Checksum Terminator NOTE: This command can not be used over a MUX32 interface. 116 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE Checks for an RFID tag in the RF field. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Tag Search All. A tag is found. Command from Host Response from LRP820 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H Response Size 00H 05H 02H 03H Command Code 88H Command Echo 88H Family ID 00H Number of Tags 01H Anticollision Index 02H Status byte 00H Timeout 07H Checksum 73H D0H Terminators 03H Checksum 99H Terminators 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 117 ABxF Command 89 (89H): EAS Set/Reset All DESCRIPTION Sets or resets the EAS feature in tag memory for all tags in range when the command is issued. DESCRIPTION When the EAS Set/Reset All command is issued, the LRP820 will respond with the number of tags affected. If the LRP820 return a 0 for Ntag it means that no tags were set or reset by the command. When multiple tag-in-field is enabled (Anticollision index is not 0), the LRP820 will return a response when the timeout period expires. When multiple tag-in-field is disabled, the LRP820 will return a response when it reads a tag or the timeout expires. Field Content Header Command Size Command length in bytes excluding the header, command size, checksum and terminator bytes. Command 89H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Timeout Timeout value given in 1 ms units (1EH - FFFEH) Checksum Optional Checksum Message Terminator 118 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE This example assumes that the tags-in-field are not enabled for the EAS feature. It will enabled the EAS feature for tags with Family ID 09H. The Anticollision Index is 2, so 4-8 tags are expected in the field. When the command is issued, 5 tags with Family ID 09H are found and enabled for EAS. Command from Host Response from LRP820 Field Contents Field Contents Header 02H Header 02H Command Size 00H Response Size 00H 02H 05H 02H 03H Command Code 89H Command Echo Family ID 09H Number of Tags 05H Anticollision Index 02H Status byte 08H 07H Checksum 66H D0H Terminator 03H Timeout Checksum 8FH Terminator 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 89H 119 ABxF Command 8A (8AH): EAS Start/Stop DESCRIPTION If are using the EAS feature in your application, the EAS Start/Stop command enters and exits the LRP820 from EAS mode. DISCUSSION When EAS mode has been started, the LRP820 will return a response when one or more EAS-enabled tags have entered the antenna field. It will send a second response when all EAS-enabled tags have exited the field. The command contains a control byte that toggles EAS: 1 = start, 0 = stop. A Family ID can be set so that only EAS-enabled tags from the specified Family trigger EAS responses. The Anticollision Index is ignored and should be set to 00H for this command. The EAS mode also controls the CONFIG, ERROR and RF LEDs. The following table explains LED behavior. LED(s) Behavior Description CONFIG, ERROR, RF LED OFF No EAS-enabled tag in field CONFIG LED BLINK EAS-enabled tag entered field. RF LED ON EAS tag has been read. LED will remain ON until all EAS tags have left the field. ERROR LED BLINKS Last EAS tag left the field. IMPORTANT: EAS mode prevents any other commands from being acknowledged or executed until EAS has been stopped. Field Content Header Command Size Command length in bytes excluding the header, command size, checksum and terminator bytes. Command 8AH Family ID Tag Family ID - 00H = all tags Anticollision Index Anticollision not considered for this command, 00H Checksum Optional Checksum Message Terminator 120 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE This example starts EAS mode. Three responses follow. The first is a command acknowledgment. The LRP820 sends the second when the first EAS-enabled tag enters the field, A third response is sent when field is clear of EAS-enabled tags. Family ID is set to 0 so that any EAS-enabled tag will trigger responses. Command from Host Response from LRP820 Field Contents Field Contents Header 02H Header 02H Command Size 00H Response Size 00H 8AH 02H 03H 02H 03H Command Code 8AH Command Echo Family ID 00H Number of Tags FFH Anticollision Index 00H Status byte 00H Checksum 72H Checksum 73H Terminator 03H Terminator 03H When an EAS-enabled tag enters the antennas’ field, the LRP820 responds with an EAS tag-in-field response. Response from LRP820 Field Contents Header 02H Response Size 00H Command Echo 8AH Number of Tags 01H Status byte 00H 02H 03H Checksum 71H Terminator 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 121 When all EAS-enabled tags have left the field, the LRP820 will send the following response. Response from LRP820 Field Contents Header 02H Response Size 00H Command Echo 8AH 02H 03H Number of Tags 00H Status byte 00H Checksum 72H Terminator 03H 122 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer ABxF Command 8D (8DH): Continuous Read All DESCRIPTION Starts and stops Continuous Read All mode for multiple tags. DISCUSSION Continuous Read All mode is set by the length byte. To start Continuous Read All mode send the command with valid, non-zero value for the length of the read (1-48). Stop the mode by sending the command with a read length of 0. While in this mode, any other command can be issued and it will be handled properly. After processing the new command, the LRP will resume the Continuous Read All mode. The command has a parameter, tag delay, that can prevent multiple reads of the same tag. A tag is not read a second time until a specified number of tags have been read since it was last read. Allowed value are from 0 up to 255 (FFH), where 0 means the tag can be re-read anytime. When Continuous Read All mode is interrupted with other commands, the tag delay count is stopped during execution of the other commands and then resumed. The LRP820 will respond with an acknowledge packet followed by data packets for each tag read. CONFIG LED blinks after each packet transmission. Field Content Header Command Size Command length in bytes excluding the header, command size, checksum and terminator bytes. Command 8DH Family ID Tag Family ID - 00H = all tags Anticollision Index Anticollision not considered for this command, 00H Start Address Tag address for the start of the read Read Length 1-48 = start, 0 = stop Tag Delay Number of tags that must be read before the same tag will be read again (0-225) Checksum Optional Checksum Message Terminator NOTE: This command can not be used with a MUX32 interface> Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 123 EXAMPLE Reads 4 bytes of data from the tag starting at address 0001H. The Family ID byte is set to zero so all tags will be read. The Anticollision Index is set to 1 so 2 to 4 tags will be expected. The Tag Delay is set to 20 (14H). Two tags respond with read data. Command from Host Response from LRP820 Field Contents Field Contents Header 02H Header 02H Command Size 00H Response Size 00H Command Code 8DH Command Echo 8DH Family ID 00H Checksum 71H Anticollision Index 01H Terminator 03H Start Address 00H Read Length 00H 02H 08H 02H 01H 01H 04H Tag Delay 14H Checksum 50H Terminator 03H 124 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer After the LRP820 sends the acknowledgment, it will send the read data from the 2 tags. Response from LRP820 Field Contents Header 02H Response Size 00H Command Echo/Tag 1 8DH Data from address 0001H 05H Data from address 0002H AAH Data from address 0003H 21H Data from address 0004H 44H Checksum 59H Terminator 03H Header 02H Response Size 00H Command Echo/Tag 2 85H Data from address 0001H 05H Data from address 0002H AAH Data from address 0003H 21H Data from address 0004H 44H Checksum 59H Terminator 03H 02H 05H 02H 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 125 ABxF Command 8E (8EH): Memory Lock All DESCRIPTION This command “locks” tag addresses in four byte blocks. Once bytes are locked, they can not be unlocked. DISCUSSION The memory can be locked only in 4-byte blocks. The command passes a two byte word with bits assigned to 4-byte blocks that can be locked. Remaining bits can lock the EAS feature and the lock configuration itself. When multiple tag-in-field is enabled (Anticollision Index is not 0), the LRP820 will return a response when the timeout period expires. When multiple tag-in-field is disabled, the LRP820 will return a response when it locks bytes or the timeout expires. Attempting to write to locked bytes will return a write timeout error in the status byte. If you write to addresses that contain both locked and non-locked bytes, the LRP820 will return a write error in the status byte. The configuration word formatted as shown below. Byte LockLSB LockMSB 126 Bit Description Tag bytes 0-3 Tag bytes 4-7 Tag bytes 8-11 Tag bytes 12-15 Tag bytes 16-19 Tag bytes 20-23 Tag bytes 24-27 Tag bytes 28-31 Tag bytes 32-35 Tag bytes 36-39 10 Tag bytes 40-43 11 Tag bytes 44-47 12 Lock Configuration 13 Lock EAS feature 14 Reserved 15 Reserved Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer The command is formatted as shown below. Field Remarks Header Command Size Command length in bytes excluding the header, command size, checksum and terminator bytes. Command 8EH Family Code Tag Family ID - 00H = all tags Anticollision index Number of tags-in-field expected Timeout Timeout value given in 1 ms units LockMSB Bits 8-15 of the configuration word LockLSB Bits 0-7 of the configuration word Checksum Optional Checksum Message Terminator EXAMPLE This example will lock bytes 0-3 on all tags-in-field with the Family ID of 02H. Two tags are found and locked. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H 8EH 07H 02H 03H Command Code 8EH Command Echo Family ID 02H Number of Tags 02H Anticollision Index 01H Status byte 08H 07H Checksum 64H D0H Terminator 03H Timeout LockMSB 00H LockLSB 01H Checksum 8FH Terminator 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 127 ABxF Command 94 (94H): SN Fill DESCRIPTION Fill an RFID tag, identified by serial number, with a one byte value over multiple contiguous addresses. DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses. The SN Fill command requires a specific serial number of the tag to be filled. It will fill the tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. When Fill Length is set to 0, the LRP820 will write fill data from the start address to the end of the tags memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command 94H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address 2-byte value for the starting tag address Fill Length 2-byte value for the length of the fill in number of bytes Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Tag Serial Number 8-byte tag serial number Data value byte 1 byte of fill Checksum Optional Checksum Terminator 128 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE Writes 'A' (41H) to the tag specified by serial number starting at address 0005H for the following next consecutive 4 bytes. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the configuration. Command from Host Response from LRP820 Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H 94H 0EH 02H 03H Command Code 94H Command Echo Family ID 00H Number of Tags 01H Anticollision Index 02H Status byte 00H Timeout 07H Checksum 67H D0H Terminators 03H SN byte 1 ADH SN byte 2 23H SN byte 3 81H SN byte 4 1DH SN byte 5 C3H SN byte 6 66H SN byte 7 78H SN byte 8 21H Fill byte 41H Checksum 13H Terminators 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 129 ABxF Command 95 (95H): SN Block Read DESCRIPTION Read a block of data from an RFID tag. DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. A special error packet is sent if the timeout expires. If the read range exceeds the last tag address, the LRP820 will return an invalid format error message (error code 21H). Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command 95H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address 2-byte value for the starting tag address Block Size 2-byte value for the length of the read in number of bytes Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Tag Serial Number 8-byte tag serial number Checksum Optional Checksum Terminator 130 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: Reads 2 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the SN Block Read. If the timeout expires before reading a tag the response packet is: 02H 02H 00 03 FF 00 Status Chk 03H. Command from Host Response from LRP820, tag found Field Contents Field Contents Header 02H 02H 02H Header Command Size 00H Response Size 00H Command Code 95H Command Echo 95H Family ID AAH 05H Anticollision Index 02H Data from address 0001H Start address 00H Data from address 0002H AAH Block size 00H 11H 01H 02H 02H 03H Checksum B8H Terminator 03H Timeout, 2 seconds 07H SN byte 1 ADH SN byte 2 23H SN byte 3 81H Field Contents SN byte 4 1DH 02H SN byte 5 C3H Header SN byte 6 66H Response Size 00H SN byte 7 78H FFH D0H Response from LRP820, tag not found 02H 03H 21H Command Fail Checksum A3H Ntag 00H Terminator 03H Status byte 08H Checksum B8H Terminator 03H SN byte 8 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 131 ABxF Command 96 (96H): SN Block Write DESCRIPTION Write a block of data to an RFID tag identified by its serial number. DISCUSSION The SN Block Write command is used to write segments of data to contiguous areas of tag memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The SN Block Write consists of a start address followed by the data stream to be written to the RFID tag specified by the serial number given in the command. If the block size exceeds the last tag address, the LRP820 will return an invalid format error message (error code 21H). Field Content Header Packet Size Packet length in bytes excluding the header, packet size, checksum and terminator bytes. 0007H plus the number of data bytes Command 96H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address 2-byte value for the starting tag address Block Size 2-byte value for the length of the write in number of bytes Timeout 2-byte value for timeout in 1 ms units (1EH - FFFEH) Tag Serial Number 8-byte tag serial number Data Data bytes to be written Checksum Optional Checksum Terminator 132 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer EXAMPLE: Writes 4 bytes of data to the tag starting at address 0000H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the SN Block Write. Command from Host Response from LRP820 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H Response Size 00H 15H 02H 03H Command Code 96H Command Echo 96H Family ID 03H Number of tags 01H Anticollision Index 03H Status byte 00H Start address 00H Checksum 65H 00H Terminators 03H Block Size 00H 04H Timeout, 2 seconds 07H SN byte 1 ADH SN byte 2 23H SN byte 3 81H SN byte 4 1DH SN byte 5 C3H SN byte 6 66H SN byte 7 78H SN byte 8 21H Data to write to address 0000H 52H Data to write to address 0001H 46H Data to write to address 0002H 49H Data to write to address 0003H 44H D0H Checksum 1EH Terminators 03H Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 133 ABxF Command 97 (97H): SN Block Read All DESCRIPTION Read a block of data from all RFID tags-in-field or all those with the specified Family ID. Data will be returned with the serial number of the corresponding tag. DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command if there is no tag family ID. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP820 will return a syntax error. The response to this command will contain the serial number of the responding tags preceding the data from those tags. The termination packet is transmitted when the timeout expires. Each packet will be sent to the host as soon as it is available. The returned serial numbers can be used to read/write to tags-in-field via the SN Block Read/Write command. The SN Block Read All consists of Family ID and an Anticollision Index, a start address and length, followed by a timeout value and the message terminator, , as shown below. A special termination packet is sent when the timeout expires. If the Anticollision Index is 0, a response is returned when the operation is successfully completed on 1 tag, or when the timeout expires. A termination packet is not sent for successful completion if the Anticollision Index is 0. If the read range exceeds the last tag address, the LRP820 will return an error message in the status byte. 134 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer The command is formatted as follows. Field Content Header Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command 97H Family ID Tag Family ID - 00H = all tags Anticollision Index Number of tags expected Start Address 2-byte value for the starting tag address Block Size 2-byte value for the length of the read in number of bytes Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH) Checksum Optional Checksum Terminator NOTE: This command can not be used with a MUX32 interface. Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer 135 EXAMPLE: Reads 4 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the SN Block Read All. The Tag Family byte is set to zero so all tags will be read. Three tags respond with data. Command from Host Response from LRP820 Field Contents Field Contents Header 02H Header/tag 1 02H Command Size 00H Response Size 00H 02H 09H 02H 0DH Command Echo 97H Command Code 97H Family ID 03H SN byte 1/tag 1 ADH Anticollision Index 00H SN byte 2/ tag 1 23H Start address 00H SN byte 3/tag 1 81H 00H SN byte 4/tag 1 1DH Block Size 00H SN byte 5/tag 1 C3H 04H SN byte 6/tag 1 66H Timeout, 2 seconds 07H SN byte 7/tag 1 78H D0H SN byte 8/tag 1 21H Checksum 81H Data byte 1/ tag 1 52H Terminators 03H Data byte 2/tag 1 46H Data byte 3/tag 1 49H Data byte 4/tag 1 44H Checksum 06H Terminators 03H 136 Copyright © 2000 Escort Memory Systems LRP820-Series Long-Range Passive Reader/Writer Header/tag 2 02H Response Size 00H 02H 0DH Command Code 97H SN byte 1/tag 2 ADH SN byte 2/ tag 2 23H SN byte 3/tag 2 81H SN byte 4/tag 2 1DH SN byte 5/tag 2 C3H SN byte 6/tag 2 66H SN byte 7/tag 2 78H SN byte 8/tag 2 21H Data byte 1/ tag 2 52H Data byte 2/tag 2 46H Data byte 3/tag 2 49H Data byte 4/tag 2 44H Checksum 06H Terminators 03H Header/tag 3 02H Response Size 00H Header 02H Response Size 00H Command Echo FFH 02H 03H Number of tags 03H Status byte 08H Checksum F2H Terminators