Balluff LRP75 RFID Reader/Writer User Manual LRP75

BALLUFF inc RFID Reader/Writer LRP75

UserManual.wiki >

Balluff >

LRP75 User Manual >

Manual R5 HTML Version

1. Manual R5
2. Manual R2

Manual R5

OPERATOR’S MANUAL

LRP75 Long Range

Passive

Reader/Writer

Manual Revision 5, 9-02

Publication # 17-1289

Escort Memory Systems Warranty

Escort Memory Systems warrants that all products of its own manufacture conform to Escort Memory Sys-

tems specifications and are free from defects in material and workmanship when used under normal operat-

ing 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 noti-

fied 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 state-

ment, representation, agreement or understanding oral or written, made by an agent, distributor, representa-

tive, 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 cus-

tom 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 responsi-

bility 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 Sys-

tems, 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

LRP75 Long Range Passive Reader/Writer i

Chapter 1 Getting Started

1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.3 FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.4 Changes and Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Chapter 2 Mechanical Specifications

2.1 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.3 RF Range and Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.4 Locating the LRP75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.4.1 Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Chapter 3 Power and Electrical Interface

3.1 Internal Junction Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2.1 Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2.2 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3 Serial Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.4 RS232/RS422 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.5 Serial Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.5.1 RS232 and Power Cable . . . . . . . . . . . . . . . . . . . . . . . . 10

3.5.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.6 LED Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chapter 4 Configuration Menu

4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1.1 Using the EC Program . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2.1 Set COM1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2.2 Set Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2.3 Download Software Updates . . . . . . . . . . . . . . . . . . . . . 16

Chapter 5 Standard RFID Interface

5.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.2 Command Timeout Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.3 Address Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.4 ABx Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.4.1 ABx Standard Error Format . . . . . . . . . . . . . . . . . . . . . . 20

5.5 Command Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.6 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 . . . . . . . . 25

5.6.5 Command 8 (08 Hex): Tag Search . . . . . . . . . . . . . . . . 26

Table of Contents

ii LRP75 Long Range Passive Reader/Writer

5.6.6 Command D (0D Hex): Start/Stop Continuous

Block Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.6.7 Command E (0EH) Read SN and Data . . . . . . . . . . . . . 30

5.6.8 Command F (0FH) Start/Stop Continuous Read

SN and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

5.7 ABx Fast Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.7.1 ABx Command Packet Structure . . . . . . . . . . . . . . . . . 33

5.7.2 Command 4 (04 Hex): Tag Fill . . . . . . . . . . . . . . . . . . . 35

5.7.3 Command 5 (05 Hex): Block Read . . . . . . . . . . . . . . . . 38

5.7.4 Command 6 (06 Hex): Block Write . . . . . . . . . . . . . . . . 40

5.7.5 Command 7 (07H): Read Tag Serial Number . . . . . . . . 42

5.7.6 Command 8 (08 Hex): Tag Search . . . . . . . . . . . . . . . . 44

5.7.7 Command D (0D Hex): Start/Stop Continuous

Block Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

5.7.8 Command E (0EH) Read SN and Data . . . . . . . . . . . . . 49

5.7.9 Command F (0FH) Start/Stop Continuous Read

SN and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Appendix A Technical Specifications

A.1 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

A.2 Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

A.3 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

A.4 Communication Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 55

Appendix B LRP75 Beta Connections

B.1 Internal Junction Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

B.2 Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

B.3 Serial Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Appendix C Models and Accessories................................ 59

Appendix D ASCII Chart............................................................. 61

LRP75 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 non-

conducting 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 LRP75 is encased in a NEMA2 enclosure. The LRP75 is

equipped with an internal antenna that has a range of 4 inches.

The LRP75 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.

1.2 Unpacking and Inspection

When you unpack the LRP75, 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 is supplied with the LRP75:

1 LRP75

2 Short screws

2 Long screws

2 Threaded inserts

Getting Started

2LRP75 Long Range Passive Reader/Writer

The following components are required for configuring a complete

system:

• LRP-Series Passive Read/Write Tags

• LRP75-to-host cable (user-supplied)

• RS232/RS422 host

• 24 Vdc +/- 10%, 5 W power supply

1.3 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 LRP75 not expressly approved

by Escort Memory Systems, could void the user's authority to operate

the equipment.

LRP75 Long Range Passive Reader/Writer 3

Mechanical Specifications

2.1 Dimensions

Figure 2-1 shows the dimensions and mounting hole locations for the

LRP75 Reader/Writer.

Figure 2-1. LRP75 dimensions and mounting hole locations

2.2 Mounting Options

The LRP75 ships with mounting screws and threaded inserts to

provide mounting options. The LRP75 can be through-bolted with the

two longer screws or mounted with an adhesive backing such as

Velcro.®

If you do not use the long screws to through-bolt the LRP75, you

should install the threaded inserts and use the short screws to secure

the lid.

To install the threaded inserts:

1. Place the LRP75 upside down on a firm surface.

2. Place the threaded inserts, smooth end first, into the two holes

and press in firmly.

3. From the lid side of the LRP75, insert the screws and tighten them

until the inserts are flush with the bottom of LRP75.

Mechanical Specifications

4LRP75 Long Range Passive Reader/Writer

2.3 RF Range and Orientation

The following information should be considered when positioning the

LRP75. 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. LRP75 reading range

2.4 Locating the LRP75

The reading range of the LRP75 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 LRP75. The

reader should not be located close to any sources of electromagnetic

radiation. Do not mount a LRP75 closer than two meters from another

LRP75, 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.

Mechanical Specifications

LRP75 Long Range Passive Reader/Writer 5

2.4.1 Guidelines

• Isolate the LRP75 from electromagnetic radiation.

• Avoid surrounding the LRP75 with metal.

• Maintain at least two meters spacing between adjacent LRP75s.

• Stay within the guaranteed range of the tag you are using.

• Conform with EIA RS232 and RS422 standards.

Mechanical Specifications

6LRP75 Long Range Passive Reader/Writer

This page left blank intentionally.

LRP75 Long Range Passive Reader/Writer 7

Power and Electrical Interface

3.1 Internal Junction Blocks

The LRP75 is connected to external power and communications

cabling through an internal terminal strip. The power and serial

communication junction block (J1) has 10 terminals and accepts AWG

22-14 wires.

Figure 3-1. Internal junction block

NOTE:Earlier models of the LRP75 have different power and serial

communications connections. For more information, see

Appendix B,

LRP75 Beta Connections

3.2 Power

3.2.1 Requirement

The LRP75 power supply requirements are:

• 24 Vdc +/- 10%

• 5 Watts maximum consumption

The maximum current consumption at 24 Vdc is 200 mA.

J1 Terminal Block

Ground Screw

Power and Electrical Interface

8LRP75 Long Range Passive Reader/Writer

3.2.2 Connections

Connection to DC power is through pins 1 and 2 of the internal

terminal block J1.

3.3 Serial Communications

The LRP75 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 LRP75 is set to automatically enter run mode seven seconds

after power-on the device. This allows you to enter the configuration

program by entering a <control D> after power-on. If no commands

are received by the reader/writer during the seven seconds, the

LRP75 enter 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 9600

Parity none

Data bits 8

Stop bit 1

NOTE:The LRP75 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.

Table 3-1: J1 Power Connections

Terminal Description

1+24 Vdc

2 Power Ground

Power and Electrical Interface

LRP75 Long Range Passive Reader/Writer 9

3.5 Serial Connections

The LRP75 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.

Table 3-2 gives the pinouts for the J1 terminal block.

NOTE:In order to configure the unit for RS422, you must first

establish communications through RS232 and update the

communication 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.

Table 3-2: J1 Serial Communications Pinouts

Terminal Function

3 Reserved, no connection

4 Signal Ground (DB9, pin 5)

5 RS232 RX (wired to host DB9, pin 3)

6 RS232 TX (wired to host DB9, pin 2)

7RS422 RX +

8RS422 TX +

9RS422 RX -

10 RS422 TX -

Power and Electrical Interface

10 LRP75 Long Range Passive Reader/Writer

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. LRP75 to PC host demo

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 9941 or 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 LRP75’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 P18-

45. 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.

Power and Electrical Interface

LRP75 Long Range Passive Reader/Writer 11

To connect your cable to the LRP75:

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 LRP75 enclosure and gland nut,

you may have difficulty sealing 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 LRP75 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: LRP75 LED Indicator

LED Action LRP75 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

<Ctrl> D to enter configuration mode.

Fast RED

Blink

Configuration

mode

If the LRP75 receives a <Ctrl> 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

LRP75

upgrade

While downloading a new, or custom,

program to the LRP75, the LED will

blink GREEN.

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.

Power and Electrical Interface

12 LRP75 Long Range Passive Reader/Writer

RED and

GREEN

Executing

Continuous

Block Read

The LED will be both RED and GREEN

(orange) indicates the LRP75 is in

continuous mode. There is short RED

flash when data sent to the host.1

1. When Software Handshaking is enabled, and the host has sent

the LRP75 an XOFF, the RED LED will be on while the LRP75

transmit buffer fills. The LED will remain RED until an XON is

received and the LRP buffer is emptied.

Table 3-3: LRP75 LED Indicator

LED Action LRP75 state Description

LRP75 Long Range Passive Reader/Writer 13

Configuration Menu

4.1 Introduction

The LRP75 contains a configuration program in EEPROM memory for

defining the data format and serial protocol. After the LRP75 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 <control D> within this seven second period to initialize the

Configuration Menu. If the LRP75 does not receive a <control D>, 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

LRP75/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 LRP75 commands. The

.HEX file downloads to the LRP are in Intel Hex format.

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.

Configuration Menu

14 LRP75 Long Range Passive Reader/Writer

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) 0

Length (1 to 48) 48

Delay Between Duplicate Decodes (0 to 60) 1

Raw Read Response? [0] NO [1] CR terminate [2] CR/LF

terminate 2

Save Changes to EEPROM? [0] No [1] Yes

Configuration Menu

LRP75 Long Range Passive Reader/Writer 15

The LRP75 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

LRP75 will wait for an ABx command after reset. If you choose 0

(NO), then the LRP75 configuration is complete and you are given the

option to save the settings.

[1] Continuous Block Read (0DH) active

After reset, the LRP75 will be in Continuous Block Read Mode just as

if you had issued a Continuous Block Read (0DH) to the LRP75. 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 LRP75 will be performing Continuous Read SN Data.

This is the same as if the 0FH command had been issued to the

LRP75. 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 LRP75 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 LRP75 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.

Configuration Menu

16 LRP75 Long Range Passive Reader/Writer

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.

LRP75 Long Range Passive Reader/Writer 17

Standard RFID Interface

5.1 Introduction

The LRP75 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

LRP75.

The LRP75 stores incoming bytes in a buffer and scans for a start

character (AA Hex or <STX><STX>). When a start character is found,

it will check for the terminating character (FFFF Hex or <ETX>).

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 LRP75 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.

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

Standard RFID Interface

18 LRP75 Long Range Passive Reader/Writer

For practical reasons (wakeup time, overhead) timeout values less

than 30 ms have negligible affects on LRP75 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 LRP75 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 LRP75 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 LRP75 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).

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 19

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 LRP75 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 LRP75 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 LRP75 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 LRP75 is in Continuous Read SN and Data mode.

Standard RFID Interface

20 LRP75 Long Range Passive Reader/Writer

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.

A Block Write fail error message would appear as: AAFF 0006

FFFFH.

5.5 Command Descriptions

The LRP75 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 LRP75 will write fill

Error Response from the LRP75

MSB LSB

AAH FFH

00H Error Code

FFH FFH

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 21

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 LRP75

will return a syntax error.

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.

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

Command from the Host Response from the LRP75

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

Standard RFID Interface

22 LRP75 Long Range Passive Reader/Writer

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.

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

Term inato r

FFFFH

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 23

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 LRP75

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

Standard RFID Interface

24 LRP75 Long Range Passive Reader/Writer

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.

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

Term inato r

FFFFH

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 25

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.

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.

Command from the Host Response from the LRP75

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

Field Description

Header AAH

Command Command number in hex

Timeout Timeout value given in 1 ms units (1EH - FFFEH)

Message

Terminator

FFFFH

Standard RFID Interface

26 LRP75 Long Range Passive Reader/Writer

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.

5.6.5 Command 8 (08 Hex): Tag Search

DESCRIPTION

Check to see if there is an RFID tag in the LRP75 field.

DISCUSSION

This command will activate the reader/write to "look" for a tag in the

RF field. If the LRP75 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.

Command from the Host Response from the LRP75

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

Field Description

Header AAH

Command Command number in hex

Timeout Timeout value given in 1 ms units (1EH - FFFEH)

Message

Term inato r

FFFFH

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 27

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.

5.6.6 Command D (0D Hex): Start/Stop Continuous

Block Read

DESCRIPTION

When in Continuous Block Read mode, the LRP75 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 LRP75 reads the

specified data and passes it to the host. The LRP75 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 LRP75 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 LRP75

continuously read any tag in the RF field and send the data to the

host.

The LRP75 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 LRP75 receives any other command from the host while

performing continuous read, an error (0DH) will be sent to the host.

Command from the Host Response from the LRP75

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

Standard RFID Interface

28 LRP75 Long Range Passive Reader/Writer

NOTE:Other commands will NOT be performed when the LRP75 is

performing continuous read.

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 LRP75 will send a response confirming its in

Continuous Block Read 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. A 0 length

stops continuous mode.

Delay Between

Identical Reads

Time period that the tag must be out of reading

range before the LRP75 will send the same data to

the host.

Message

Term inato r

FFFFH

Command from the Host Response from the LRP75

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

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 29

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

Standard RFID Interface

30 LRP75 Long Range Passive Reader/Writer

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.

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.

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

Term inato r

FFFFH

Command from the Host Response from the LRP75

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

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 31

5.6.8 Command F (0FH) Start/Stop Continuous Read

SN and Data

DESCRIPTION

When in Continuous Block Read SN and Data mode, the LRP75

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 LRP75 reads the SN

and data, and then passes them to the host. The LRP75 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 LRP75 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

LRP75 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 LRP75 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 LRP75 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 LRP75 will send the same data to

the host.

Start/Stop 01H starts continuous mode and 00H stops it.

Message

Terminator

FFFFH

Standard RFID Interface

32 LRP75 Long Range Passive Reader/Writer

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.

When a tag comes into range of the LRP75, it will perform the read

and return the data as follows.

Command from the Host Response from the LRP75

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

Response from the LRP75

MSB LSB Remarks

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

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 33

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.

Following a successful operation, the LRP75 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 2 <STX><STX> (02H, 02H)

Command

Size

2 Packet length in bytes excluding the header,

command size, checksum and terminator

bytes.

Command 1 Command Code (XXH)

(Data) variable Command parameters/data

Checksum 1 Optional Checksum

Terminator 1 <ETX> (03H)

Field Number

of Bytes Description

Header 2 <STX><STX> (02H, 02H)

Response

Size

2 Packet length in bytes excluding the header,

command size, checksum and terminator

bytes.

Command

Echo

1 Command Echo (XXH)

(Data) variable Response data

Checksum 1 Optional Checksum

Terminator 1 <ETX> (03H)

Standard RFID Interface

34 LRP75 Long Range Passive Reader/Writer

If the LRP75 encounters a fault, it will respond with the following:

• 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.

Field Number

of Bytes Description

Header 2 <STX><STX> (02H, 02H)

Response

Size

2 Packet length in bytes excluding the header,

command size, checksum and terminator

bytes.

Error Flag 1 FFH

Error Code 1 Hex error code

Checksum 1 Optional Checksum

Terminator 1 <ETX> (03H)

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 35

EXAMPLE

The following is a typical command using a checksum.

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

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.

Command from Host

Field Contents

Header

<STX><STX> 02H

02H

Command Size 00H

03H

Command Code 01H

Timeout 07H

D0H

Checksum 24H

Terminator <ETX> 03H

Sum these values to

calculate the checksum

Standard RFID Interface

36 LRP75 Long Range Passive Reader/Writer

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

LRP75 will return a syntax error.

Field Description

Header <STX><STX>

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

Term inato r

FFFFH

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 37

A response to a successful command will follow this form.

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.

Field Description

Header <STX><STX>

Response Size Packet length in bytes, excluding the header,

command size, checksum and terminator bytes.

Command Echo 04H

Checksum optional checksum

Message

Terminator

FFFFH

Command from the Host Response from the LRP75

Field Contents Field Contents

Header 02H Header 02H

02H 02H

Command Size 00H Response Size 00H

08H 01H

Command Code 04H Command Echo 04H

Start Address 00H Terminator <ETX> 03H

05H

Fill Length 00H

0AH

Timeout, 2 seconds 07H

D0H

Fill byte 41H

Terminator <ETX> 03H

Standard RFID Interface

38 LRP75 Long Range Passive Reader/Writer

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.

Field Description

Header <STX><STX>

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

Term inato r

FFFFH

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 39

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 LRP75

Field Contents Field Contents

Header 02H Header 02H

02H 02H

Command Size 00H Response Size 00H

07H 05H

Command Code 05H Command Echo 05H

Start Address 00H Data from address

0001H 05H

01H Data from address

0002H AAH

Read Length 00H Data from address

0003H E7H

04H Data from address

0004H 0AH

Timeout, 2 seconds 07H Terminator <ETX> 03H

D0H

Terminator <ETX> 03H

Standard RFID Interface

40 LRP75 Long Range Passive Reader/Writer

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.

Field Description

Header <STX><STX>

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

Te rm in ato r <E TX >

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 41

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 LRP75

Field Contents Field Contents

Header 02H Header 02H

02H 02H

Command Size 00H Response Size 00H

0BH 01H

Command Code 06H Command Echo 06H

Start Address 00H Terminator <ETX> 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 <ETX> 03H

Standard RFID Interface

42 LRP75 Long Range Passive Reader/Writer

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.

Field Description

Header <STX><STX>

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

Term inato r

FFFFH

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 43

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 LRP75

Field Contents Field Contents

Header 02H Header 02H

02H 02H

Command Size 00H Response Size 00H

03H 09H

Command Code 07H Command Echo 07H

Timeout, 2 seconds 07H SN Byte 1 1EH

D0H SN Byte 2 6EH

Terminator <ETX> 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 <ETX> 03H

Standard RFID Interface

44 LRP75 Long Range Passive Reader/Writer

5.7.6 Command 8 (08 Hex): Tag Search

DESCRIPTION

Check to see if there is an RFID tag in the LRP75 field.

DISCUSSION

This command will activate the reader/write to "look" for a tag in the

RF field. If the LRP75 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 <STX><STX>

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

Term inato r

FFFFH

Standard RFID Interface

LRP75 Long Range Passive Reader/Writer 45