Contents
- 1. Manual R5
- 2. Manual R2
Manual R2
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| Document ID | 283028 |
| Application ID | v3xpGpYHygP0kb8BToRogA== |
| Document Description | Manual R2 |
| Short Term Confidential | No |
| Permanent Confidential | No |
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| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 61.14kB (764213 bits) |
| Date Submitted | 2002-11-12 00:00:00 |
| Date Available | 2002-11-12 00:00:00 |
| Creation Date | 2002-09-17 12:35:06 |
| Producing Software | Acrobat Distiller 5.0 (Windows) |
| Document Lastmod | 2002-09-17 12:38:19 |
| Document Title | LRP76.book |
| Document Creator | FrameMaker 6.0 |
| Document Author: | Steven Baird |
OPERATOR’S MANUAL LRP76 Long Range Passive Reader/Writer Manual Revision 2, 9-02 Publication # 17-1293 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 Table of Contents Chapter 1 Getting Started 1.1 1.2 1.3 1.4 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Changes and Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 2 Mechanical Specifications 2.1 2.2 2.3 2.4 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 RF Range and Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Locating the LRP76 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.4.1 Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Chapter 3 Power and Electrical Interface 3.1 3.2 3.3 3.4 3.5 3.6 Internal Junction Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2.1 Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2.2 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Serial Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 RS232/RS422 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Serial Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.5.1 RS232 and Power Cable . . . . . . . . . . . . . . . . . . . . . . . . 10 3.5.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 LED Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Chapter 4 Configuration Menu 4.1 4.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1.1 Using the EC Program . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.1 Set COM1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.2 Set Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.3 Download Software Updates . . . . . . . . . . . . . . . . . . . . . 13 13 14 14 14 16 Chapter 5 Standard RFID Interface 5.1 5.2 5.3 5.4 5.5 5.6 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Command Timeout Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Address Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 ABx Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.4.1 ABx Standard Error Format . . . . . . . . . . . . . . . . . . . . . . 20 Command Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ABx Standard Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.6.1 Command 4 (04 Hex): Tag Fill . . . . . . . . . . . . . . . . . . . . 20 5.6.2 Command 5 (05 Hex): Block Read . . . . . . . . . . . . . . . . 22 5.6.3 Command 6 (06 Hex): Block Write . . . . . . . . . . . . . . . . . 24 5.6.4 Command 7 (07H): Read Tag Serial Number . . . . . . . . 26 5.6.5 Command 8 (08 Hex): Tag Search . . . . . . . . . . . . . . . . 27 LRP76 Long Range Passive Reader/Writer Table of Contents 5.6.6 5.7 Command D (0D Hex): Start/Stop Continuous Block Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6.7 Command E (0EH) Read SN and Data . . . . . . . . . . . . . 5.6.8 Command F (0FH) Start/Stop Continuous Read SN and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ABx Fast Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.1 ABx Command Packet Structure . . . . . . . . . . . . . . . . . 5.7.2 Command 4 (04 Hex): Tag Fill . . . . . . . . . . . . . . . . . . . 5.7.3 Command 5 (05 Hex): Block Read . . . . . . . . . . . . . . . . 5.7.4 Command 6 (06 Hex): Block Write . . . . . . . . . . . . . . . . 5.7.5 Command 7 (07H): Read Tag Serial Number . . . . . . . . 5.7.6 Command 8 (08 Hex): Tag Search . . . . . . . . . . . . . . . . 5.7.7 Command D (0D Hex): Start/Stop Continuous Block Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.8 Command E (0EH) Read SN and Data . . . . . . . . . . . . . 5.7.9 Command F (0FH) Start/Stop Continuous Read SN and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 30 31 33 33 36 38 40 42 44 46 49 51 Appendix A Technical Specifications A.1 A.2 A.3 A.4 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Communication Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 55 55 55 55 Appendix B Models and Accessories ................................ 57 Appendix C ASCII Chart.............................................................. 59 ii LRP76 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 nonconducting 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. LRP-Series passive tags provide 48 bytes of reprogrammable memory. The LRP76 is encased in a NEMA2 enclosure. The LRP76 is equipped with an internal antenna that has a range of 8 inches. The LRP76 has one serial port that supports RS232 or RS422 serial communications. The serial port is used to receive commands and software from the host and to send the data back. LRP76 Long Range Passive Reader/Writer Getting Started 1.2 Unpacking and Inspection When you unpack the LRP76, retain the original shipping carton and packing material in case any item has to be returned to Escort Memory Systems. Inspect each item carefully for evidence of damage. If any item appears to be damaged, notify your Escort Memory Systems representative immediately. The following components are required for configuring a complete system: • • • • 1.3 LRP-Series Passive Read/Write Tags LRP76-to-host cable (user-supplied) RS232/RS422 host 24 Vdc ±10%, 5 W power supply FCC Compliance 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 to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and 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. 1.4 Changes and Modifications Any changes or modifications to the LRP76 not expressly approved by Escort Memory Systems, could void the user's authority to operate the equipment. LRP76 Long Range Passive Reader/Writer 2 Mechanical Specifications 2.1 Dimensions Figure 2-1 shows the dimensions and mounting hole locations for the LRP76 Reader/Writer. Figure 2-1. LRP76 dimensions and mounting hole locations LRP76 Long Range Passive Reader/Writer Mechanical Specifications 2.2 Mounting Options The LRP76 can be mounted with screws or an adhesive backing such as Velcro.® 2.3 RF Range and Orientation The following information should be considered when positioning the LRP76. The path of the tags through the RF field should be within the guaranteed reading/writing range unless sufficient site testing has been performed to assure consistent RF communications. Figure 2-2. LRP76 reading range 2.4 Locating the LRP76 The reading range of the LRP76 is primarily affected by two environmental variables. The first, and most influential of these variables, is the presence of metal or any other electrically conductive material within the range of the antenna. The reader can be safely mounted to a metal surface without compromising the reading range; however, any conductive material within the area in front of and to the sides of the reader - anywhere a tag can be read - will affect the reading range to some extent. The most reliable method for determining the effects of metal on the reading range is to perform site tests. Electromagnetic radiation is the second environmental variable that affects the reading range and overall performance of the LRP76. The reader should not be located close to any sources of electromagnetic radiation. Do not mount a LRP76 closer than two meters from another LRP76, and a greater distance from longer-range readers, such as the EMS LRP820. Again, site testing will provide the most reliable means to determine the read range in a given environment. LRP76 Long Range Passive Reader/Writer Mechanical Specifications 2.4.1 Guidelines • • • • • Isolate the LRP76 from electromagnetic radiation. Avoid surrounding the LRP76 with metal. Maintain at least two meters spacing between adjacent LRP76s. Stay within the guaranteed range of the tag you are using. Conform with EIA RS232 and RS422 standards. LRP76 Long Range Passive Reader/Writer Mechanical Specifications This page left blank intentionally. LRP76 Long Range Passive Reader/Writer 3 Power and Electrical Interface 3.1 Internal Junction Blocks The LRP76 is connected to external power and communications cabling through an internal terminal strips. The terminal accepts AWG 22-14 wires. Ground Screw J1 Terminal Block Figure 3-1. Internal junction block 3.2 Power 3.2.1 Requirement The LRP76 power supply requirements are: • 24 Vdc +/- 10% • 5 Watts maximum consumption The maximum current consumption at 24 Vdc is 200 mA. LRP76 Long Range Passive Reader/Writer Power and Electrical Interface 3.2.2 Connections Connection to DC power is through pins 1 and 2 of the internal J1 terminal block. Table 3-1: J1 Power Connection 3.3 Terminal Description +24Vdc Power Ground Serial Communications The LRP76 offers either RS232 or RS422 communications. The RS422 option provides the superior reliability over longer distances or in noisy environments. Communication parameters, such as baud rate, are set by the configuration program. CAUTION:Do not bundle communications wiring with high current power lines. This will cause communications errors. 3.4 RS232/RS422 Interface The LRP76 is set to automatically enter run mode seven seconds after power-on the device. This allows you to enter the configuration program by entering aafter power-on. If no commands are received by the reader/writer during the seven seconds, the LRP76 enters run mode with existing operating parameters. For more information on the Configuration Menu refer to Chapter 4. To communicate with the device via RS232, set the serial communications parameters of the host as follows: Baud rate Parity Data bits Stop bit 9600 none NOTE:The LRP76 automatically resets to 9600, N, 8,1 for seven seconds whenever the power is cycled, after which it will apply the setting made in the configuration menu. LRP76 Long Range Passive Reader/Writer Power and Electrical Interface 3.5 Serial Connections The LRP76 can be wired to communicate with the host either through an RS232 or RS422 interface. Connection to the serial interface is through the J1 terminal shown in Figure 3-1 on page 7. Connect the signal ground to terminal 4 on the J1 terminal. Table 3-2 gives the communication pins for the J1 terminal block. Table 3-2: J1 Serial Communications Pinouts Terminal Function Reserved, no connection Signal Ground (DB9, pin 5) RS232 RX (wired to host DB9, pin 3) RS232 TX (wired to host DB9, pin 2) RS422 RX + RS422 TX + RS422 RX - 10 RS422 TX - NOTE:In order to configure the unit for RS422, you must first establish communications through RS232 and update the communications parameters. The signals and electrical loads should conform to the electrical specifications of EIA Standard for RS232 or RS422. The maximum cable length specified for RS232 is 50 feet. Use the RS422 interface for longer communications links. Use high quality shielded cable for these connections. LRP76 Long Range Passive Reader/Writer Power and Electrical Interface 3.5.1 RS232 and Power Cable Figure 3-2 shows how to construct a demonstration cable with power and RS232 serial communications to a PC host with a DE9 serial port connector. Figure 3-2. LRP76 to PC host demo cable 3.5.2 Wiring Use shielded cable only. Connect shield drain of the power and data cabling to either ground on the J1 connector (terminal 2 or 4). • Recommended cable for RS422 is Belden 3107A, 3108A or compatible. • Recommended cable for RS232 is Belden 9941or compatible. To fully comply with FCC and CE Regulations, wind the power and data cabling around a type 43 ferrite toroid such as Fairrite™ part number 2643803802 or Amidon™ part number FT-240-43. Install the toroid as close as possible to the LRP76’s gland nut. You must connect the internal ground screw, shown in Figure 3-1 on page 7, to the nearest earth ground outside the unit. To make the ground connection, first terminate a length of 1/8-inch copper braid with a ring terminal such as Panduit™ part number P1845. Fasten the ring terminal to the ground screw. For a tight seal, chase the braid through the gland nut against the data and power cabling. 10 LRP76 Long Range Passive Reader/Writer Power and Electrical Interface To connect your cable to the LRP76: 1. Remove the cover of the antenna by loosening the four captive screws. 2. Loosen the cord grip, feed the cable through the cord grip and attach the wires to the terminal screws. Tighten the cord grip to seal the cable. Use a cable of sufficient diameter to properly seal with the cord grip. The recommended minimum O.D. is .125 inches (3.2 mm). NOTE:Due to the small size of the LRP76 enclosure and gland nut, you may have difficulty sealing the power and communications wires passing through the gland nut. Olflex® cable part number 911285 is readily available and will satisfy the requirements of most applications. 3. Re-assemble the enclosure and secure the screws. 3.6 LED Indicator The LRP76 has one bi-color LED indicating power on and activity on the serial port. Table 3-3 shows the LED activity and meaning. Table 3-3: LRP76 LED Indicator LED Action LRP76 state Description Slow RED Blink Power-up or reset The LED will flash RED slowly for about seven seconds following power-up during which time the user may send a D to enter configuration mode. Fast RED Blink Configuration mode If the LRP76 receives a D during the initial seven second period, the LED will flash at a faster rate until configuration mode has been exited. Steady GREEN Idle The unit is ready for an ABx command. A steady GREEN LED indicates that the seven second period has elapsed without entering configuration mode, or configuration has been completed. GREEN Blink LRP76 upgrade While downloading a new, or custom, program to the LRP76, the LED will blink GREEN. LRP76 Long Range Passive Reader/Writer 11 Power and Electrical Interface Table 3-3: LRP76 LED Indicator LED Action LRP76 state Description Short RED/ GREEN Blink Executing Command While the reader/writer is occupied with a command, the LED will be flashing GREEN to RED. A RED to GREEN flash indicates a tag is being searched for, and the command is being executed. RED and GREEN Executing Continuous Block Read The LED will be both RED and GREEN (orange) indicates the LRP76 is in continuous mode. There is short RED flash when data sent to the host.1 1. 12 When Software Handshaking is enabled, and the host has sent the LRP76 an XOFF, the RED LED will be on while the LRP76 transmit buffer fills. The LED will remain RED until an XON is received and the LRP buffer is emptied. LRP76 Long Range Passive Reader/Writer 4 Configuration Menu 4.1 Introduction The LRP76 contains a configuration program in EEPROM memory for defining the data format and serial protocol. After the LRP76 has been powered, it pauses for seven seconds waiting for the command to enter the configuration program. The communication parameters during this seven second period are: • • • • 9600 baud 8 data bits No parity 1 stop bit Use a terminal emulation program (such as EC or HyperTerminal) to send a within this seven second period to initialize the Configuration Menu. If the LRP76 does not receive a , it will go "online" with the existing user-defined settings. 4.1.1 Using the EC Program The terminal emulation program, EC.EXE, is recommended for LRP76/Host communications. It can be downloaded from Escort Memory Systems Web site (www.ems-rfid.com). Unlike many other terminal emulation programs, EC.EXE can transfer binary data in ASCII hex-based format, as required by the LRP76 commands. The.HEX file downloads to the LRP are in Intel Hex format. LRP76 Long Range Passive Reader/Writer 13 Configuration Menu 4.2 Configuration Menu The Configuration Menu will display the current state of the operating parameters. To change a parameter, enter the decimal number shown in the menu for the option you want. An invalid entry will return you to the Main Menu. The Main Board Configuration menu displays the current main board software version number together with the RFID firmware version. ******** LRP75/76 Standard Program V1.3E ******** RF module:4.01J Serial Port COM1:RS232, 9600, N, 8, 1 No Handshake Operating Mode:ABx Standard Tag Type: Phillips I-CODE 1 [1] Set COM1 Parameters [2] Set Operating Mode [3] Set Tag Type [4] Restore Factory Defaults [5] Download New Program [6] Download RFID Firmware [7] Exit to Operating Mode Enter Selection: 4.2.1 Set COM1 Parameters The Set COM1 Parameters menu is given below. *** Set COM1 Parameters ** Operating mode? [0] RS232 [1] RS422 Baud Rate? [0] 1200 [1] 2400 [2] 4800 [3] 9600 [4] 19200 Data size? [0] 7bit [1] 8bit Parity? [0] None [1] Even [2] Odd Handshake [0] None [1] Xon/Xoff Save Changes to EEPROM? [0] No [1] Yes Enter the number corresponding to the parameter you wish to enable. 4.2.2 Set Operating Mode The Set Operating Mode menu is given below. *** Set Operating Mode *** Commands Protocol? [0] ABx Standard [1] ABx Fast Checksum? [0] Disabled [1] Enabled Power up performing Continuous Read? [0] NO [1] Continuous Block Read (0DH) active [2] Continuous Read SN and Data (0FH) active -> 1 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 14 LRP76 Long Range Passive Reader/Writer Configuration Menu The LRP76 supports ABx Standard and ABx Fast RFID command protocols. Select your command protocol from this menu. If you select ABx fast, you can select an optional checksum. For data delivery verification to the host, it is recommended to have the checksum enabled. You can also select from three Run Mode types. The options are: [0] NO LRP76 will wait for an ABx command after reset. If you choose 0 (NO), then the LRP76 configuration is complete and you are given the option to save the settings. [1] Continuous Block Read (0DH) active After reset, the LRP76 will be in Continuous Block Read Mode just as if you had issued a Continuous Block Read (0DH) to the LRP76. You must enter the tag start address, read length, and the delay between identical decodes values. [2] Continuous Read SN and Data (0FH) active After reset, the LRP76 will be performing Continuous Read SN Data. This is the same as if the 0FH command had been issued to the LRP76. You must enter the tag start address, read length, and the delay between identical decodes values. Raw Read Response It is possible to set the LRP76 to only send raw tag data to the host. The raw read data does not contain a header, length, command number, or terminator. If the data on the tag is all printable ASCII, then the entire packet can be printed on any terminal emulator or EC. To receive a raw read response, the LRP76 must be set to use ABx Fast, and to start in Continuous Block Read Run Mode. Raw Read Response? [0] NO [1] CR terminate [2] CR/LF terminate If you choose the raw response option 0 (NO), then standard ABx response packets are returned when a tag is read. If you choose option 1 or 2 (CR or CR/LF terminate), then the entire header and footer are removed from the response. If you choose CR or CR/LF, then a carriage return (0DH) or carriage return line feed (0DH, 0AH) is append to the raw string of data from the tag. There is no header, length, command echo, footer, or checksum in this response string. Raw Read Response does not allow any delivery or data verification. LRP76 Long Range Passive Reader/Writer 15 Configuration Menu 4.2.3 Download Software Updates The mircocontroller software can be updated by entering the 'Download New Program' mode and sending an Intel Hex file. Also, the RF firmware can be updated, by means of the 'Download RF firmware' mode. Use the HFD.EXE Windows application on the PC. Detailed download instructions are supplied with any custom or upgrade software. 16 LRP76 Long Range Passive Reader/Writer 5 Standard RFID Interface 5.1 Introduction The LRP76 features RFID commands to perform the reading/writing of tag data. The standard commands are based on the established ABx protocol. Table 5-1 lists the standard commands available in the LRP76. Table 5-1: Standard RFID Commands Command Hex Equivalent Command Name 04 Hex Tag Fill 05 Hex RF Port Block Read 06 Hex RF Port Block Write 07 Hex Read Tag Serial Number 08 Hex Tag Search 0D Hex Start/Stop Continuous Block Read 0E Hex Read SN and Data 0F Hex Start/Stop Continuous Read SN and Data The LRP76 stores incoming bytes in a buffer and scans for a start character (AA Hex or ). When a start character is found, it will check for the terminating character (FFFF Hex or ). Having identified a potentially valid command string, the standard program will check the format of the data and either perform the requested function or generate an error message. 5.2 Command Timeout Values Most commands sent to the LRP76 contain a timeout value field. This is the maximum number of milliseconds that a command will be attempted. If a command is not successfully completed within this time interval, a tag search error (08H) will be returned. When a command is successfully completed, the appropriate command response will be returned to the host. This will happen in less time than the timeout period. LRP76 Long Range Passive Reader/Writer 17 Standard RFID Interface For practical reasons (wakeup time, overhead) timeout values less than 30 ms have negligible affects on LRP76 behavior. Therefore, the examples given in this manual present the timeout range as 1EH to FFFEH (30 to 65,534 ms). Specifying a long timeout will not necessarily affect the time required to complete a command, but merely instructs the LRP76 how long to attempt the command before aborting. The timeout error is returned only if the command can not be successfully executed. For example, when the tag is not currently in the field. Using a zero timeout value is not permitted and will return a syntax error (21H). NOTE:During write commands, the tag must remain in the field until either the command completes successfully, or the timeout period has expired. If a write command is initiated with a tag in the antenna's active field and then the tag leaves the field before the command has completed or times out, data may be lost or corrupted. It is recommended that you use the longest timeout value permitted by the application. For applications where the tag positioning may not be controlled and the tag movement cannot be limited to the antenna field, longer timeouts and retries should be utilized in the application program. This will ensure the highest success rates. If an application demands the tag to travel at high speeds and retries can not be utilized, it may be required to synchronize the tag travel speed with the command timeouts. Use of a presence sensor may be required to ensure that the LRP76 cannot timeout while the tag is passing by. Many factors need to be considered for high speed applications such as; address range, command type, tag and antenna models, and the installation environment. Please contact Escort Memory Systems' application support team for help with your application. 5.3 Address Blocks All read/write operations between the tag and the LRP76 are based on 4-byte block transfers. Each operation, whether it invokes a single data byte or 48 bytes, will read/write in multiples of four bytes. This fact impacts timing issues in two cases: • When the number of data bytes is not a multiple of 4. • When the read or write does not start on one of the first block bytes (0, 4, 8 and so on). 18 LRP76 Long Range Passive Reader/Writer Standard RFID Interface In the first case, the RFID interface will first read all tag addresses affected by the transaction so that data not requested by the host is not returned or written to. For example, when you request a write to tag addresses 2 through 5 (4 bytes), the LRP will first read the tag data at addresses 0 through 7 (8 bytes), and then write to those addresses with the new data in addresses 2 through 5. When a write or read operation is executed at a starting address other than the first byte of a block, the blocks with partial data will also be included in the operation. For example, a four byte read from an odd address will take twice as long since the LRP76 will read 8 bytes. NOTE:To make your application as efficient as possible, design your tag accesses in 4-byte blocks starting on a the first byte of a block. 5.4 ABx Error Codes The LRP76 returns an error if it encounters a fault during operation. Table 5-2 list the possible error codes in Hexadecimal format. Table 5-2: ABx Error Codes Error Code Description 05H Block Read has failed 06H Block Write has failed 08H Search Tag Operation failed 21H Syntax error 0DH Command Read error. You will receive a Command Read error if you send another command while the LRP76 is in Continuous Read mode. 0FH Command Read SN and Data error. You will receive a Command Read error if you send another command while the LRP76 is in Continuous Read SN and Data mode. LRP76 Long Range Passive Reader/Writer 19 Standard RFID Interface 5.4.1 ABx Standard Error Format 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. Error Response from the LRP76 MSB LSB AAH FFH 00H Error Code FFH FFH A Block Write fail error message would appear as: AAFF 0006 FFFFH. 5.5 Command Descriptions The LRP76 supports two forms of ABx RFID commands; ABx Standard and ABx Fast. The ABx Standard is a binary protocol, word (2-byte oriented) so that the syntax table reports the Most Significant Byte (MSB) and the Least Significant Byte (LSB). In serial transmission the MSB is transmitted first. User data is passed only in the LSB meaning that one word is required for each byte of user data. ABX Fast is byte oriented and uses both MSB and LSB to pass user data. This is more efficient as each work passes two bytes of user data. 5.6 ABx Standard Commands 5.6.1 Command 4 (04 Hex): Tag Fill 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 LRP76 will write fill 20 LRP76 Long Range Passive Reader/Writer Standard RFID Interface 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 LRP76 will return a syntax error. Field Description Header AAH Command Command number in Hex 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) Data Value Byte The byte to be used as fill Message Terminator FFFFH 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 the Host Response from the LRP76 MSB LSB Remarks MSB LSB Remarks AAH 04H Perform Command 4 AAH 04H Command Echo 00H 05H Start Address = 0005H FFH FFH Message Terminator 00H 0AH Fill Length = 10 bytes (000AH) 07H D0H Timeout value 00H 41H Fill byte FFH FFH Message Terminator LRP76 Long Range Passive Reader/Writer 21 Standard RFID Interface 5.6.2 Command 5 (05 Hex): Block Read DESCRIPTION Read a block of data from an RFID tag. DISCUSSION The RF Block Read command is used to read segments of data from contiguous areas of tag memory. It is capable of transferring the entire read/write address range of the tag to the host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH. A timeout of 0 will return a syntax error. The data read from the tag is returned in the LSB of the register, and the MSB is always 00H. 22 Field Description Header AAH Command Command number in hex 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 LRP76 Long Range Passive Reader/Writer Standard RFID Interface EXAMPLE Reads 8 bytes of data from the tag starting at address 01H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Read. Command from the Host Response from the LRP76 MSB LSB Remarks MSB LSB Remarks AAH 05H Perform Command 5 AAH 05H Command Echo 00H 01H Start Address = 0001H 00H 52H Read Data 1 = 52H 00H 08H Read Block Length = 8 bytes (0008H) 00H 46H Read Data 2 = 46H 07H D0H Timeout value 00H 49H Read Data 3 = 49H FFH FFH Message Terminator 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 LRP76 Long Range Passive Reader/Writer 23 Standard RFID Interface 5.6.3 Command 6 (06 Hex): Block Write DESCRIPTION Write a block of data to an RFID tag. DISCUSSION The RF Port Block Write 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. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH. A timeout of 0 will return a syntax error. The data to be written to the tag is contained in the LSB of the register, and the MSB is always 00H. 24 Field Description Header AAH Command Command number in hex Start Address The tag address where the write will start Write Length The number of tag addresses to be written Timeout Timeout value given in 1 ms units (1EH - FFFEH) Write Data The data to be written Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer Standard RFID Interface EXAMPLE Writes 4 bytes of data to 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 Write. Command from the Host Response from the LRP76 MSB LSB Remarks MSB LSB Remarks AAH 06H Perform Command 6 AAH 06H Command Echo 00H 01H Start Address = 0001H FFH FFH Message Terminator 00H 04H Write Length= 4 bytes (0004H) 07H D0H Timeout value 00H 41H Write Data 1 = 41H 00H 46H Write Data 2 = 46H 00H 49H Write Data 3 = 49H 00H 44H Write Data 4 = 44H FFH FFH Message Terminator LRP76 Long Range Passive Reader/Writer 25 Standard RFID Interface 5.6.4 Command 7 (07H): Read Tag Serial Number DESCRIPTION This command retrieves the 8-byte tag serial number. DISCUSSION Each LRP tag has a unique serial number. This number can not 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. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH. Field Description Header AAH Command Command number in hex Timeout Timeout value given in 1 ms units (1EH - FFFEH) Message Terminator FFFFH EXAMPLE This example reads the 8-byte serial number. In this example the serial number is 1E6E3DC200000001 in hexadecimal. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Read Tag Serial Number. 26 Command from the Host Response from the LRP76 MSB LSB Remarks MSB LSB Remarks AAH 07H Perform Command 7 AAH 07H Command Echo 07H D0H Timeout value 00H 1EH Tag ID byte 1 FFH FFH Message Terminator 00H 6EH Tag ID byte 2 00H 3DH Tag ID byte 3 00H C2H Tag ID byte 4 00H 00H Tag ID byte 5 00H 00H Tag ID byte 6 00H 00H Tag ID byte 7 00H 01H Tag ID byte 8 FFH FFH Message Terminator LRP76 Long Range Passive Reader/Writer Standard RFID Interface 5.6.5 Command 8 (08 Hex): Tag Search DESCRIPTION Check to see if there is an RFID tag in the LRP76 field. DISCUSSION This command will activate the reader/write to "look" for a tag in the RF field. If the LRP76 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. If no tag is present it will return an error message. Field Description Header AAH Command Command number in hex 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 the Host Response from the LRP76 MSB LSB Remarks MSB LSB Remarks AAH 08H Perform Command 8 AAH 08H Command Echo 07H D0H Timeout value FFH FFH Message Terminator FFH FFH Message Terminator LRP76 Long Range Passive Reader/Writer 27 Standard RFID Interface 5.6.6 Command D (0D Hex): Start/Stop Continuous Block Read DESCRIPTION When in Continuous Block Read mode, the LRP76 sends block read commands continuously to any tag in range of the antenna. The value in the length field controls the command (start/stop). DISCUSSION When a tag enters the field of the antenna, the LRP76 reads the specified data and passes it to the host. The LRP76 continues to read the tag, but will not send the same data to the host until the tag has been out of the antenna’s range for a specified time period. This period is called the Delay Between Identical Reads. It prevents redundant data transmission when the LRP76 is in Continuous Block Read mode. The Delay Between Identical Reads can have an integral value in seconds between 0 and 60. A value of 0 makes the LRP76 continuously read any tag in the RF field and send the data to the host. The LRP76 remains in Continuous Block Read mode until it receives a new continuous read command with a zero read length. To stop Continuous Block Read Mode, issue the Start/Stop Continuous Read command with a read length of zero (0). If the LRP76 receives any other command from the host while performing continuous read, an error (0DH) will be sent to the host. NOTE:Other commands will NOT be performed when the LRP76 is performing continuous read. 28 Field Description Header AAH Command Command number in hex Start Address The tag address where the read will start Read Length The number of tag addresses to be read. A 0 length stops continuous mode. Delay Between Identical Reads Time period that the tag must be out of reading range before the LRP76 will send the same data to the host. Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer Standard RFID Interface EXAMPLE The following example reads 8 bytes of data from a tag at address 05H, with a delay between identical reads of 2. After a tag is read, it must remain out of the RF field for at least 2 seconds before it will be read again. The LRP76 will send a response confirming its in Continuous Block Read mode. Command from the Host Response from the LRP76 MSB LSB Remarks MSB LSB Remarks AAH 0DH Perform Command D AAH 0DH Command Echo 00H 05H Start Address FFH FFH Message Terminator 00H 08H Read Length 00H 02H Delay Between Identical Reads FFH FFH Message Terminator When a tag arrives, the LRP will send the requested tag data. Command from the Host MSB LSB Remarks AAH 0DH Command Echo 00H 44H Data byte 1 00H 20H Data byte 2 00H 54H Data byte 3 00H 61H Data byte 4 00H 67H Data byte 5 00H 20H Data byte 6 00H 20H Data byte 7 00H 20H Data byte 8 FFH FFH Message Terminator LRP76 Long Range Passive Reader/Writer 29 Standard RFID Interface 5.6.7 Command E (0EH) Read SN and Data DESCRIPTION Command E reads the tag's Serial Number along with tag data, and sends it back to the host in one response packet. If the length is zero (0), then only the Serial Number is returned to the host. Field Description Header AAH Command Command number in hex 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 EXAMPLE The below example reads the SN and one data byte at tag address five (05H), with a two second timeout. The tag data is 20H. 30 Command from the Host Response from the LRP76 MSB LSB Remarks MSB LSB Remarks AAH 0EH Perform Command E AAH 0EH Command Echo 00H 05H Start Address 00H 7DH Serial Number byte 1 00H 01H Read Length 00H EFH Serial Number byte 2 07H D0H 2 Second Timeout 00H 4CH Serial Number byte 3 FFH FFH Message Terminator 00H 00H Serial Number byte 4 00H 00H Serial Number byte 5 00H 00H Serial Number byte 6 00H 00H Serial Number byte 7 00H 01H Serial Number byte 8 00H 20H Data byte FFH FFH Message Terminator LRP76 Long Range Passive Reader/Writer Standard RFID Interface 5.6.8 Command F (0FH) Start/Stop Continuous Read SN and Data DESCRIPTION When in Continuous Block Read SN and Data mode, the LRP76 sends Read SN and Data commands continuously to any tag in range of the antenna. The value in the Start/Stop field controls the command (start/stop). DISCUSSION When a tag enters the field of the antenna, the LRP76 reads the SN and data, and then passes them to the host. The LRP76 continues to read the tag, but will not send the same data to the host until the tag has been out of the antenna’s range for a specified time period. This period is called the Delay Between Identical Reads. It prevents redundant data transmission when the LRP76 is in Continuous Read SN and Data mode. The Delay Between Identical Reads can have an integral value in seconds between 0 and 60. A value of 0 makes the LRP76 continuously read any tag in the RF field and send the data to the host. The Start/Stop Continuous Read SN and Data command has a field to start and stop continuous reading. To stop Continuous Read SN and Data, issue the command with zero (0) in the start/stop byte. If the LRP76 receives any other command from the host while in continuous mode, an error (0FH) will be sent to the host. NOTE:Other commands will NOT be performed when the LRP76 is in continuous mode. Field Description Header AAH Command Command number in hex Start Address The tag address where the read will start Read Length The number of tag addresses to be read Delay Between Identical Reads Time period that the tag must be out of reading range before the LRP76 will send the same data to the host. Start/Stop 01H starts continuous mode and 00H stops it. Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer 31 Standard RFID Interface EXAMPLE This example will wait until a tag is in range and then reads 2 bytes of data from the tag starting at address 05H. Command from the Host Response from the LRP76 MSB LSB Remarks MSB LSB Remarks AAH 0FH Perform Command F AAH 0FH Command Echo 00H 05H Start Address = 0005H FFH FFH Message Terminator 00H 02H Read Length = 2 bytes 00H 0AH 10 second delay between identical reads 00H 01H Start Continuous mode FFH FFH Message Terminator When a tag comes into range of the LRP76, it will perform the read and return the data as follows. Response from the LRP76 MSB LSB Remarks 32 AAH 0FH Command Echo 00H 52H Serial Number 1 = 52H 00H 46H Serial Number 2 = 46H 00H 49H Serial Number 3 = 49H 00H 44H Serial Number 4 = 44H 00H 50H Serial Number 5 = 50H 00H 51H Serial Number 6 = 51H 00H 53H Serial Number 7 = 53H 00H 01H Serial Number 8 = 01H 00H 55H Data Byte 1 = 55H 00H 56H Data Byte 2 = 56H FFH FFH Message Terminator LRP76 Long Range Passive Reader/Writer Standard RFID Interface 5.7 ABx Fast Commands 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. 5.7.1 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 Description Header (02H, 02H) Command Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command Command Code (XXH) (Data) variable Command parameters/data Checksum Optional Checksum Terminator (03H) Following a successful operation, the LRP76 will respond with the following. The data field and the checksum may not be present depending on the command and checksum setting. Field Number of Bytes Description Header (02H, 02H) Response Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Command Echo Command Echo (XXH) (Data) variable Response data Checksum Optional Checksum Terminator (03H) LRP76 Long Range Passive Reader/Writer 33 Standard RFID Interface If the LRP76 encounters a fault, it will respond with the following: Field Number of Bytes Description Header (02H, 02H) Response Size Packet length in bytes excluding the header, command size, checksum and terminator bytes. Error Flag FFH Error Code Hex error code 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. 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. 34 LRP76 Long Range Passive Reader/Writer Standard RFID Interface EXAMPLE The following is a typical command using a checksum. Command from Host Field Contents Header 02H 02H Command Size 00H 03H Command Code 01H Timeout 07H Sum these values to calculate the checksum D0H Checksum 24H Terminator 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 LRP76 Long Range Passive Reader/Writer 35 Standard RFID Interface 5.7.2 Command 4 (04 Hex): Tag Fill 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. 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 LRP76 will return a syntax error. 36 Field Description Header Command Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command 04H Start Address 2-byte value for the tag address where the fill will start Fill Length 2-byte value for the number of tag addresses to be filled Timeout 2-byte timeout value given in 1 ms units (1EH FFFEH) Data Value Byte The byte to be used as fill Checksum optional checksum Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer Standard RFID Interface A response to a successful command will follow this form. Field Description Header Response Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command Echo 04H Checksum optional checksum Message Terminator FFFFH 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 the Host Response from the LRP76 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H 02H Response Size 08H 00H 01H Command Code 04H Command Echo 04H Start Address 00H Terminator 03H 05H Fill Length 00H 0AH Timeout, 2 seconds 07H D0H Fill byte 41H Terminator 03H LRP76 Long Range Passive Reader/Writer 37 Standard RFID Interface 5.7.3 Command 5 (05 Hex): Block Read DESCRIPTION Read a block of data from an RFID tag. DISCUSSION The RF Block Read command is used to read segments of data from contiguous areas of tag memory. It is capable of transferring the entire read/write address range of the tag to the host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH. A timeout of 0 will return a syntax error. The data read from the tag is returned in the LSB of the register, and the MSB is always 00H. 38 Field Description Header Command Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command 05H Start Address 2-byte value for the tag address where the read will start. Read Length 2-byte value for the number of tag addresses to be read. Timeout 2-byte timeout value given in 1 ms units (1EH FFFEH) Checksum optional checksum Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer Standard RFID Interface EXAMPLE Reads 4 bytes of data from the tag starting at address 01H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Read. Command from the Host Response from the LRP76 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H 02H Response Size 07H 00H 05H Command Code 05H Command Echo 05H Start Address 00H Data from address 0001H 05H 01H Data from address 0002H AAH 00H Data from address 0003H E7H 04H Data from address 0004H 0AH 07H Terminator 03H Read Length Timeout, 2 seconds D0H Terminator 03H LRP76 Long Range Passive Reader/Writer 39 Standard RFID Interface 5.7.4 Command 6 (06 Hex): Block Write DESCRIPTION Write a block of data to an RFID tag. DISCUSSION The RF Port Block Write 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. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH. A timeout of 0 will return a syntax error. The data to be written to the tag is contained in the LSB of the register, and the MSB is always 00H. 40 Field Description Header Command Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command 06H Start Address 2-byte value for the tag address where the write will start. Write Length 2-byte value for the number of tag addresses to be written to. Timeout 2-byte timeout value given in 1 ms units (1EH FFFEH) Data Data bytes to be written Checksum optional checksum Terminator LRP76 Long Range Passive Reader/Writer Standard RFID Interface EXAMPLE Writes 4 bytes of data to 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 Write. Command from the Host Response from the LRP76 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H 02H Response Size 0BH 00H 01H Command Code 06H Command Echo 06H Start Address 00H Terminator 03H 01H Write Length 00H 04H Timeout, 2 seconds 07H D0H Data to write to address 0001H 52H Data to write to address 0002H 46H Data to write to address 0003H 49H Data to write to address 0004H 44H Terminator 03H LRP76 Long Range Passive Reader/Writer 41 Standard RFID Interface 5.7.5 Command 7 (07H): Read Tag Serial Number DESCRIPTION This command retrieves the 8-byte tag serial number. DISCUSSION Each LRP tag has an unique serial number. This number can not be changed and is not part of the 48 available data bytes. The tag serial number will be return 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. 42 Field Description Header Command Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command 07H Timeout 2-byte timeout value given in 1 ms units (1EH FFFEH) Checksum optional checksum Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer Standard RFID Interface EXAMPLE This example reads the 8-byte serial number. In this example the serial number is 1E6E3DC200000001 in hexadecimal. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Read Tag Serial Number. Command from the Host Response from the LRP76 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H 02H Response Size 03H 00H 09H Command Code 07H Command Echo 07H Timeout, 2 seconds 07H SN Byte 1 1EH D0H SN Byte 2 6EH 03H SN Byte 3 3DH SN Byte 4 C2H SN Byte 5 00H SN Byte 6 00H SN Byte 7 00H SN Byte 8 01H Terminator 03H Terminator LRP76 Long Range Passive Reader/Writer 43 Standard RFID Interface 5.7.6 Command 8 (08 Hex): Tag Search DESCRIPTION Check to see if there is an RFID tag in the LRP76 field. DISCUSSION This command will activate the reader/write to "look" for a tag in the RF field. If the LRP76 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. If no tag is present it will return an error message. 44 Field Description Header Command Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command 08H Timeout 2-byte timeout value given in 1 ms units (1EH FFFEH) Checksum optional checksum Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer Standard RFID Interface 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 the Host Response from the LRP76 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H 02H Response Size 03H 00H 01H Command Code 08H Command Echo 08H Timeout, 2 seconds 07H Terminator 03H D0H Terminator 03H LRP76 Long Range Passive Reader/Writer 45 Standard RFID Interface 5.7.7 Command D (0D Hex): Start/Stop Continuous Block Read DESCRIPTION When in Continuous Block Read mode, the LRP76 sends block read commands continuously to any tag in range of the antenna. The value in the length field controls the command (start/stop). DISCUSSION When a tag enters the field of the antenna, the LRP76 reads the specified data and passes it to the host. The LRP76 continues to read the tag, but will not send the same data to the host until the tag has been out of the antenna’s range for a specified time period. This period is called the Delay Between Identical Reads. It prevents redundant data transmission when the LRP76 is in Continuous Block Read mode. The Delay Between Identical Reads can have an integral value in seconds between 0 and 60. A value of 0 makes the LRP76 continuously read any tag in the RF field and send the data to the host. The LRP76 remains in Continuous Block Read mode until it receives a new continuous read command with a zero read length. To stop Continuous Block Read Mode, issue the Start/Stop Continuous Read command with a read length of zero (0). If the LRP76 receives any other command from the host while performing continuous read, an error (0DH) will be sent to the host. NOTE:Other commands will NOT be performed when the LRP76 is performing continuous read. 46 Field Description Header Command Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command 0DH Start Address 2-byte value for the tag address where the read will start Read Length 2-byte value for the length of the read Delay Between Identical Reads 1-byte delay (0-60 seconds) Checksum optional checksum Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer Standard RFID Interface EXAMPLE The following example reads 4 bytes of data from a tag at address 05H, with a delay between identical reads of 2. After a tag is read, it must remain out of the RF field for at least 2 seconds before it will be read again. The LRP76 will send a response confirming its in Continuous Block Read mode. Command from the Host Response from the LRP76 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H 02H Response Size 06H 00H 01H Command Code 0DH Command Echo 0DH Start Address 00H Terminator 03H 05H Read Length 00H 04H Delay Between Identical Decodes 02H Terminator 03H LRP76 Long Range Passive Reader/Writer 47 Standard RFID Interface When a tag arrives, the LRP will send the requested tag data. Response from the LRP76 Field Contents Header 02H 02H Response Size 00H 05H 48 Command Echo 0DH Data from address 0005H 05H Data from address 0006H AAH Data from address 0007H E7H Data from address 0008H 0AH Terminator 03H LRP76 Long Range Passive Reader/Writer Standard RFID Interface 5.7.8 Command E (0EH) Read SN and Data DESCRIPTION Command E reads the tag's Serial Number along with tag data, and sends it back to the host in one response packet. If the length is zero (0), then only the Serial Number is returned to the host. Field Description Header Command Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command 0EH Start Address 2-byte value for the tag address where the read will start Read Length 2-byte value for the length of the read Timeout 2-byte timeout value given in 1 ms units (1EH FFFEH) Checksum optional checksum Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer 49 Standard RFID Interface EXAMPLE The below example reads the SN and one data byte at tag address five (05H), with a two second timeout. The tag data is 20H. Command from the Host Response from the LRP76 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H 02H Response Size 05H 0AH Command Code 0EH Command Echo 0EH Start Address 00H SN Byte 1 1EH 05H SN Byte 2 6EH 00H SN Byte 3 3DH 01H SN Byte 4 C2H 07H SN Byte 5 00H D0H SN Byte 6 00H 03H SN Byte 7 00H SN Byte 8 01H Data Byte 20H Terminator 03H Read Length Timeout Terminator 50 00H LRP76 Long Range Passive Reader/Writer Standard RFID Interface 5.7.9 Command F (0FH) Start/Stop Continuous Read SN and Data DESCRIPTION When in Continuous Block Read Serial Number and Data mode, the LRP76 sends Read SN and Data commands continuously to any tag in range of the antenna. The value in the Start/Stop field controls the command (start/stop). DISCUSSION When a tag enters the field of the antenna, the LRP76 reads the SN and data, and then passes them to the host. The LRP76 continues to read the tag, but will not send the same data to the host until the tag has been out of the antenna’s range for a specified time period. This period is called the Delay Between Identical Reads. It prevents redundant data transmission when the LRP76 is in Continuous Read SN and Data mode. The Delay Between Identical Reads can have an integral value in seconds between 0 and 60. A value of 0 makes the LRP76 continuously read any tag in the RF field and send the data to the host. The Start/Stop Continuous Read SN and Data command has a field to start and stop continuous reading. To stop Continuous Read SN and Data, issue the command with zero (0) in the start/stop byte. If the LRP76 receives any other command from the host while in continuous mode, an error (0FH) will be sent to the host. NOTE:Other commands will NOT be performed when the LRP76 is in continuous mode. Field Description Header Command Size Packet length in bytes, excluding the header, command size, checksum and terminator bytes. Command 0FH Start Address 2-byte value for the tag address where the read will start Read Length 2-byte value for the length of the read Delay Between Identical Reads 1-byte delay (0-60 seconds) Start/Stop Byte 01H starts continuous mode and 00H stops it. Checksum optional checksum Message Terminator FFFFH LRP76 Long Range Passive Reader/Writer 51 Standard RFID Interface EXAMPLE This example will wait until a tag is in range and then reads 2 bytes of data from the tag starting at address 05H. Command from the Host Response from the LRP76 Field Contents Field Contents Header 02H Header 02H 02H Command Size 00H 02H Response Size 07H 00H 01H Command Code 0FH Command Echo 0FH Start Address 00H Terminator 03H 05H Read Length 00H 02H 52 Delay Between Identical Decodes 02H Start/Stop Byte 01H Terminator 03H LRP76 Long Range Passive Reader/Writer Standard RFID Interface When a tag comes into range of the LRP76, it will perform the read and return the data as follows. Response from the LRP76 Field Contents Header 02H 02H Response Size 00H 0BH Command Echo 0EH SN Byte 1 1EH SN Byte 2 6EH SN Byte 3 3DH SN Byte 4 C2H SN Byte 5 00H SN Byte 6 00H SN Byte 7 00H SN Byte 8 01H Data Byte 1 20H Data Byte 2 20H Terminator 03H LRP76 Long Range Passive Reader/Writer 53 Standard RFID Interface This page left blank intentionally. 54 LRP76 Long Range Passive Reader/Writer Appendix A Technical Specifications A.1 Electrical Characteristics Power Voltage Consumption A.2 Physical Characteristics Dimensions (L x W x H) Connection Enclosure A.3 4.80 x 4.72 x 1.165" 122 x 120 x 55 mm Terminal strip via PG-9 cordgrip ABS Environmental Protection Class A.4 24 Vdc +/- 10% 250 mA max. NEMA 2 Communication Characteristics RF Interface COM1 LRP-Series Passive RFID System RS232/RS422 LRP76 Long Range Passive Reader/Writer 55 Technical Specifications This page left blank intentionally. 56 LRP76 Long Range Passive Reader/Writer Appendix B Models and Accessories Model Description LRP76 Long Range Passive Reader/Writer for LRP-Series tags LRP Series RFID Tags Description LRP125 Long-range passive read/write tag, 25 mm dia. round, 48 bytes memory LRP125HT Long-range passive read/write tag, 25 mm dia. round, 48 bytes memory, survives 240° temperatures LRP250 Long-range passive read/write tag, 50 mm square, 48 bytes memory LRP250HT Long-range passive read/write tag, 50 mm square, 48 bytes memory, survives 240° temperatures LRP125HT-FLX Long-range passive read/write tag, 25 mm dia. round, 48 bytes memory, survives 240° temperatures, flexible with high temperature adhesive backing LRP250HT-FLX Long-range passive read/write tag, 50 mm dia. round, 48 bytes memory, survives 240° temperatures, flexible with high temperature adhesive backing LRP-L5555 Long-range passive read/write tag, 55 mm square, 48 bytes memory, thermal transfer with adhesive backing LRP-L2666 Long-range passive read/write tag, 26 x 66 mm, 48 bytes memory, thermal transfer with adhesive backing LRP-L4982 Long-range passive read/write tag, 49 x 82 mm, 48 bytes memory, thermal transfer with adhesive backing LRP-P125 Long-range passive read/write tag, 25 mm square, 48 bytes memory, PCB LRP-P3858 Long-range passive read/write tag, 38 x 58 mm, 48 bytes memory, PCB LRP-P5050 Long-range passive read/write tag, 50 mm square, 48 bytes memory, PCB LRP76 Long Range Passive Reader/Writer 57 Models and Accessories This page left blank intentionally. 58 LRP76 Long Range Passive Reader/Writer Appendix C ASCII Chart Decimal Hex Character Decimal Hex Character 000 00 NUL 032 20 (SPACE) 001 01 SOH 033 21 002 02 STX 034 22 003 03 ETX 035 23 004 04 EOT 036 24 005 05 ENQ 037 25 006 06 ACK 038 26 007 07 BEL 039 27 ’ 008 08 BS 040 28 009 09 HT 041 29 010 0A LF 042 2A 011 0B VT 043 2B 012 0C FF 044 2C 013 0D CR 045 2D 014 0E SO 046 2E 015 0F SI 047 2F 016 10 DLE 048 30 017 11 DC1 049 31 018 12 DC2 050 32 019 13 DC3 051 33 020 14 DC4 052 34 021 15 NAK 053 35 022 16 SYN 054 36 023 17 ETB 055 37 024 18 CAN 056 38 025 19 EM 057 39 026 1A SUB 058 3A 027 1B ESC 059 3B 028 1C FS 060 3C 029 1D GS 061 3D 030 1E RS 062 3E 031 1F US 063 3F LRP76 Long Range Passive Reader/Writer 59 ASCII Chart Decimal Hex Character Decimal Hex Character 064 40 096 60 ‘ 065 41 097 61 066 42 098 62 067 43 099 63 068 44 100 64 069 45 101 65 070 46 102 66 071 47 103 67 072 48 104 68 073 49 105 69 074 4A 106 6A 075 4B 107 6B 076 4C 108 6C 077 4D 109 6D 078 4E 110 6E 079 4F 111 6F 080 50 112 70 081 51 113 71 082 52 114 72 083 53 115 73 084 54 116 74 085 55 117 75 086 56 118 76 087 57 119 77 088 58 120 78 089 59 121 79 090 5A 122 7A 091 5B 123 7B 092 5C 124 7C 093 5D 125 7D 094 5E 126 7E 095 5F 127 7F DEL 60 LRP76 Long Range Passive Reader/Writer
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File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.3 Linearized : No Modify Date : 2002:09:17 12:38:19Z Create Date : 2002:09:17 12:35:06Z Page Count : 64 Creation Date : 2002:09:17 12:35:06Z Mod Date : 2002:09:17 12:38:19Z Producer : Acrobat Distiller 5.0 (Windows) Author : Steven Baird Metadata Date : 2002:09:17 12:38:19Z Creator : Steven Baird Title : LRP76.book Page Mode : UseOutlinesEXIF Metadata provided by EXIF.tools