Balluff LRP800 User Manual

OPERATOR'S MANUAL

LRP830-Series

Long-Range Passive

Reader/Writers

Manual Revision 3, July, ‘00

Publication #17-1271

Escort Memory Systems Warranty

Escort Memory Systems warrants that all products of its own manufacture conform to Es cort Memory Systems specifications and arefreefromdefects 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) yearafter delivery, unlessotherwisespecified,andis 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 Sys tems 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 de fect 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 here under. No statement, representation, agreement orunderstandingoral 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 andexecutedby an authorized Escort Memory Systems employee. Escort Memory Systems makes no other warranty of any kindwhatsoever,expressedorimplied, and all im plied 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 andcauseofanyalleged defect. No liability is assumed for expendable items such as lamps andfuses. No warranty is made with respecttocustom 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 authorizedofficerofEscort Memory Systems andacceptedbythe 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 informationwhich is protected by copyright. All rights are re served. The information in this manual has been carefully checked and is believed to be accu rate; 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, aDatalogic Group Company. Other brand and product names mentionedare trademarks or registered trademarks of their respective holders.

Escort Memory Systems A Datalogic Group Company 170 Technology Circle Scotts Valley, CA 95066 Telephone (831) 438-7000 FAX (831) 438-5768 www.ems-rfid.com email: info@ems-rfid.com

ii LRP830-Series Long-Range Passive Reader/Writer

-

TABLE OF CONTENTS

1GETTING STARTED 1

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

1.2 Unpacking and Inspection .................3

2MECHANICAL SPECIFICATIONS 4

2.1 Dimensions .........................4

2.2 RF Range and Orientation .................7

2.3 Mounting Guidelines ...................12

Guidelines .........................13

3POWER AND ELECTRICAL INTERFACE 14

3.1 Connector Panel ......................14

3.2 Power Connector .....................15

3.3 COM1/COM2 Connector .................15

Serial Communications Cabling .............16

3.4 DeviceNet Connector ...................16

3.5 Input Connector ......................17

3.6 Output Connector .....................17

3.7 Digital I/O Wiring.....................18

Inputs ...........................18

Outputs ..........................18

3.8 Power Requirement ....................23

Power Options.......................23

Power from the DeviceNet Bus ..............24

Power via the external supply connector .........24

Power from the DeviceNet bus and from an external power

supply ...........................26

3.9 LED Indicators ......................27

4SERIAL AND BUS COMMUNICATIONS 29

4.1 Serial Interfaces ......................29

Digital Board DIP Switch .................30

4.2 Bus Interfaces .......................32

DeviceNet Interface Board DIP Switch .........33

iii

5MENU CONFIGURATION 35

5.1 How to Enter Menu Configuration ............35

5.2 Set-up Operating Parameters ...............36

Set COM1 Parameters...................37

Set COM2 Parameters...................37

Set Operating Mode ....................37

Set RF Communication ..................39

Restore Factory Defaults .................39

Return to Main Menu ...................40

5.3 Download New Program .................40

5.4 Downloading DSP Firmware ...............40

5.5 Exit to Operating Mode ..................41

6 RFID INTERFACE 42

6.1 Introduction ........................42

Command Timeout ....................42

DeviceNet and Anticollision ABx Limitations ......44

6.2 ABx Error Codes .....................45

Non-Anticollision Error Codes ..............45

ABx Standard .......................45

ABx Fast .........................46

Anticollision Status Byte .................47

6.3 Anticollision Commands .................48

Family Interrogation ...................48

Family ID .........................48

Anticollision Index ....................49

6.4 ABx Standard Protocol ..................51

ABxS Command 4 (04H): Fill Tag ............51

ABxS Command 5 (05H): Block Read ..........53

ABxS Command 6 (06H): Block Write..........55

ABxS Command 7 (07H): Read Tag Serial Number . . . 57

ABxS Command 8 (08H): Tag Search ..........58

ABxS Command D (0DH): Continuous Block Read . . . 59

ABxS Command 10 (10H): Set Output ..........62

ABxS Command 11 (11H): Input Status .........64

ABxS Command 84 (84H): Fill Tag All .........66

ABxS Command 85 (85H): Block Read All .......68

ABxS Command 86 (86H): Block Write All .......70

ABxS Command 87 (87H): Read Tag SN All ......72

iv LRP830-Series Long-Range Passive Reader/Writer

ABxS Command 88 (88H): Tag Search All .......74

ABxS Command 89 (89H): EAS Set/Reset All......75

ABxS Command 8A (8AH): EAS Start/Stop .......76

ABxS Command 8D (8DH): Continuous Read All ....78

ABxS Command 8E (8EH): Memory Lock All......80

ABxS Command 94 (94H): SN Fill............82

ABxS Command 95 (95H): SN Block Read ......84

ABxS Command 96 (96H): SN Block Write .......86

ABxS Command 97 (97H): SN Block Read All .....88

6.5 ABx Fast Protocol.....................90

ABx Command Packet Structure: .............90

Command/Response Size .................91

Checksum .........................92

ABxF Command 4 (04H): Fill Tag ............93

ABxF Command 5 (05H): Block Read ..........95

ABxF Command 6 (06H): Block Write..........97

ABxF Command 7 (07H): Read Tag Serial Number . . . 99

ABxF Command 8 (08H): Tag Search .........101

ABxF Command D (0DH): Continuous Block Read . . 102

ABxF Command 10 (10H): Set Output .........105

ABxF Command 11 (11H): Input Status ........107

ABxF Command 84 (84H): Fill All ...........109

ABxF Command 85 (85H): Block Read All.......111

ABxF Command 86 (86H): Block Write All ......113

ABxF Command 87 (87H): Read Tag SN All......115

ABxF Command 88 (88H): Tag Search All .......117

ABxF Command 89 (89H): EAS Set/Reset All .....119

ABxF Command 8A (8AH): EAS Start/Stop ......121

ABxF Command 8D (8DH): Continuous Read All . . . 124

ABxF Command 8E (8EH): Memory Lock All .....127

ABxF Command 94 (94H): SN Fill ...........130

ABxF Command 95 (95H): SN Block Read ......132

ABxF Command 96 (96H): SN Block Write ......134

ABxF Command 97 (97H): SN Block Read All.....136

6.6 ABx ASCII Protocol ...................140

Command Packet Structure: ...............140

Command/Response Size ................141

Checksum ........................142

Example ASCII Command ...............142

v

7 LRP830 DEVICENET INTERFACE 144

7.1 Introduction .......................144

Scan Rates ........................144

COM1 LED Indicator ..................145

DeviceNet Interface ...................145

7.2 Interface Board Monitor Mode .............145

Enter Interface Board Monitor..............145

7.2.1 Downloading Firmware to the Interface Board .....147

7.2.2 Downloading with the EC Emulation Program .....148

7.2.3 Display Interface Board Configuration Parameters . . . 148

7.2.4 Interface Board Configuration Editor ..........150

7.2.5 Edit Configuration Command. ..............151

7.2.6 Configuration Parameter Validation ...........153

7.2.7 Standard DeviceNet Parameters .............154

Produce and Consume Sizes ...............154

Produce size — ABx Standard, 8 Byte Read ......154

Produce size — ABx Fast, 8 Byte Read ........155

Consume size — ABx Standard, 8 Byte Read .....155

Consume size — ABx Fast, 8 Byte Read ........156

LRP830 Transmit Message Size .............156

LRP830 Receive Message Size .............157

Protocol: Poll or Strobe .................157

DeviceNet Serial Number ................157

7.2.8 LRP830 Specific Parameters ..............158

Device Type .......................158

ABx separation......................158

ABx Non-separation ...................158

Polled Commands in ABx Non-separation Mode ....159

Error Management ....................159

Trigger Feature .....................160

Buf Flush Enable.....................161

Buf Flush Delay .....................161

7.2.9 Device Type Protocols. .................162

Generic Device Type Protocol..............162

Header Device Type Protocol ..............163

vi LRP830-Series Long-Range Passive Reader/Writer

ASPECIFICATIONS 165

BMODELS AND ACCESSORIES 166

C ASCII CHART 168

D LRP830 DEMONSTRATION 170

Before You Begin ....................170

Using DNSW32 or DNSW16 ..............171

EDEVICENET PROTOCOL EXAMPLES 178

Header Device Type Protocol ..............179

Header Format ......................179

Header Device Type Command Protocol ........182

Calculating Message Size ................183

vii

NOTICE

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate ra

dio frequency energy and, if not installed and used in accordance with the in structions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try and correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.

n

-

Increase the separation between the equipment and the re

n

-

ceiver.

Connect the equipment into an outlet on a circuit different

n

from that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for

n

help.

CAUTION Changes or modifications not expressly approved by Escort Memory Systems could void the user’s authority to operate the equipment.

viii LRP830-Series Long-Range Passive Reader/Writer

1 GETTING STARTED

1.1 Introduction

Escort Memory Systems' passive read/write system is a complete family of field-proven read/write Radio-Frequency Identification products. The sys tem consists of RFID tags, reader/writers, antennas, controllers, bus inter faces, and ancillary equipment. Tags can be attached to a product or its carrier and act as an electronic identifier, job sheet, portable database, or manifest. Tags are read and updated via an Escort Memory Systems Reader/Writer, through any nonconductive material, while moving or stand ing still.

Escort Memory Systems' LRP-Series long-range passive RFID system is the latest in our line of high performance, industrial RFID equipment. The passive design of the LRP read/write system uses the RF field from the antenna to power the tag, eliminating the need for tag batteries. The LRP passive read/write system is designed to provide cost effective RFID data collection and control solutions to automation and material handling applications.

The LRP system uses the internationally recognized ISM frequency of 13.56 MHZ to both power the tag, and to establish a radio link to transfer the information.

-

The LRP830 is specifically designed to work with LRP-Series passive tags, which provide 48 bytes of reprogrammable memory.

1

The LRP830 supports the industrial bus protocol DeviceNet. The LRP830 is encased in a NEMA4 enclosure and features two serial ports, 4 optoisolated inputs, 4 opto-isolated outputs. The LRP830-04 is equipped with an antenna designed for conveyor mounting and the LRP830-08 features a rectangular plate antenna.

The COM1 serial port is used to receive commands from the host and to send the data back. The LRP830 COM1 can be configured either as a DeviceNet, RS232, or RS422 interface.

COM2 is an RS232 serial port used to download new software releases and to setup the configuration parameters.

2 LRP830-Series Long-Range Passive Reader/Writer

1.2 Unpacking and Inspection

Unpack the LRP830 and documentation and retain the original shipping carton and packing material in case any items need to be returned. Inspect each item carefully for evidence of damage. If any item appears to be dam aged, notify your distributor immediately. The LRP830 is delivered with the following components:

LRP830 (-04, -08) Reader/Writer

n

LRP830 to Antenna Cable

n

LRP830 Operator's Manual

n

The following components are required for configuring a complete system:

LRP-Series Passive Read/Write Tags

n

User supplied LRP830-to-host cable

n

DeviceNet host

n

18 - 30 Vdc, 36 W (1.5 A @ 24 Vdc) power supply

n

Mating connectors. Please see Appendix B for more

information.

-

3

2 MECHANICAL SPECIFICATIONS

2.1 Dimensions

Figure 1 gives the dimensions for the LRP830. Figures 2-3 show the dimen sions of the 04 and 08 remote antennas.

inches

mm

-

Figure 1 — LRP830 Dimensions

4 LRP830-Series Long-Range Passive Reader/Writer

Figure 2 — LRP-04 Conveyor-Mount Antenna

inches

mm

5

inches

mm

Figure 3 — LRP-08 Antenna Dimensions

6 LRP830-Series Long-Range Passive Reader/Writer

2.2 RF Range and Orientation

Figure 4 shows the correct tag orientation as it passes the antenna. Figures 5-7 show the RF fields of the LRP830-04 and LRP830-08 antennas. Tables 1- 3 give the typical and guaranteed ranges of the LRP series tags.

Figure 4 — LRP-08 to Tag Orientation

7

Table 1 — Antenna to Tag Ranges, LRP-04 Antenna with Metal*

Tag Typical Range (Z)

inches/mm

LRP125(HT) 2.50/64 2.00/51

LRP250(HT) 6.75/171 6.00/152

LRP250HT-FLX 6.75/171 6.00/152

LRP-L5555 6.75/171 6.00/152

LRP-L2666 5.75/146 5.00/127

LRP-L4982 8.00/203 7.00/178

LRP-L90140 9.00/229 8.00/203

LRP-P125 2.50/64 2.00/51

LRP-P3858 6.00/152 5.00/127

LRP-P5050 7.00/178 6.00/152

*These ranges are determined with metal near the -04 antenna as it would be in most conveyor mountings. The actual tuning and testing of the -04 antenna is done with the antenna mounted be tween two metal rollers on metal rails. The metal rollers are mounted 1/4” from the antenna.

NOTE: Proximity to metal, CRT devices, and other sources of electromagnetic radiation may affect the range of the antenna.

Guaranteed Range

inches/mm

-

Figure 5 — Side View of RF Field, LRP-04 Antenna, Metal

8 LRP830-Series Long-Range Passive Reader/Writer

Figure 6 — End View of RF Field, LRP-04 Antenna, Metal

9

Table 2 — Antenna to Tag Ranges, LRP-40 Antenna, No Metal*

Tag Typical Range (Z)

inches/mm

LRP125(HT) 3.00/76 2.25/57

LRP250(HT) 8.50/216 7.50/191

LRP250HT-FLX 8.50/216 7.50/191

LRP-L5555 8.50/216 7.50/191

LRP-L2666 7.00/178 6.00/152

LRP-L4982 10.00/254 9.00/229

LRP-L90140 12.00/305 11.00/279

LRP-P125 3.00/76 2.25/57

LRP-P33858 7.50/190 6.50/165

LRP-P5050 8.50/216 7.50/191

*These ranges calculated with no metal near the antenna. NOTE: Proximity to metal, CRT devices, and other sources of electromagnetic radiation may affect

the range of the antenna.

Guaranteed Range

inches/mm

Figure 7 — End View of RF Field, LRP-08 Antenna, No Metal

10 LRP830-Series Long-Range Passive Reader/Writer

Figure 8 — Side View of RF Field, LRP-08 Antenna, No Metal

Table 3 — Antenna to Tag Ranges, LRP-08 Antenna, No Metal

Tag Typical Range (Z)

inches/mm

LRP125(HT) 8.00/203 7.00/178

LRP250(HT) 17.00/432 15.00/381

LRP250HT-FLX 17.00/432 15.00/381

LRP-L5555 17.00/432 15.00/381

LRP-L2666 16.00/406 13.00/330

LRP-L4982 20.00/508 18.00/457

LRP-L90140 25.00/635 22.00/559

LRP-P125 8.00/203 7.00/178

LRP-P3858 16.00/406 14.00/355

LRP-5050 17.00/432 15.00/381

*These ranges calculated with no metal near the antenna. NOTE: Proximity to metal, CRT devices, and other sources of electromagnetic radiation may affect

the range of the antenna.

Guaranteed Range

inches/mm

11

2.3 Mounting Guidelines

Electromagnetic radiation and metal affect the range of the LRP830. Mount the LRP830 and antenna to minimize the impact of these factors. The RF field of the antenna can also cause errors when antennas are spaced too closely together. Do not position adjacent antennas closer than 2 meters from each other.

The remote antennas for the LRP830 have a cable length 2 meters. Sur rounding the antenna with metal will greatly reduce the reading range of the antenna. As rule of thumb, keep any metal structure away from the antenna at least more than the reading range along the axis, and a third of such dis tance on the side. The mounting holes are accessed through the inside of the LRP830 Reader/Writer. Refer to Figure 9 for locations and dimensions.

-

inches

mm

Figure 9 — LRP830 Mounting Holes

12 LRP830-Series Long-Range Passive Reader/Writer

Special mounting instructions must be followed to get optimal read/write performance from the LRP830-08 antenna. Mount the antenna with a mini mum 5.90" (150mm) spacing from any metal to the back or sides of the an tenna, as shown in Figure 10.

-

Figure 10 — LRP830-08 Antenna Mounting

Guidelines

n

Isolate the LRP830 and antenna from electromagnetic

radiation.

n

Avoid surrounding LRP830 and remote antenna with metal.

n

Maintain at least 2 meters minimum spacing between adjacent

LRP830s or antennas.

n

Stay within the guaranteed range for the tag to be used.

n

Conform with EIA RS232, RS422 and RS485 standards.

13

3 POWER AND ELECTRICAL INTERFACE

3.1 Connector Panel

Figure 11 shows the LRP connectors, LEDs and connector panel. Unused connectors can be sealed with optional connector caps. Please see Appendix B for ordering information.

Figure 11 — Connector Panel

14 LRP830-Series Long-Range Passive Reader/Writer

3.2 Power Connector

Figure 12 shows the power connector pin designations.

Figure 12 — Power Connector

3.3 COM1/COM2 Connector

Figure 13 shows the connector pin designations for the COM port connections.

Figure 13 — COM1/COM2 Connector

15

Serial Communications Cabling

Escort Memory Systems recommends that you use Belden cables 3082A (trunkline) or 3084A (dropline) for RS485/RS422 communications. Use Belden cable 9941 for RS232 communications. More information on Belden cables can be found on their web site at www.belden.com.

3.4 DeviceNet Connector

Figure 14 shows the connections for the DeviceNet connector.

Figure 14 — DeviceNet Connector Pinouts

16 LRP830-Series Long-Range Passive Reader/Writer

3.5 Input Connector

Figure 15 shows the Input Connector pin designations.

Figure 15 — Input Connector Pinouts

3.6 Output Connector

Figure 16 shows the Output Connector pin designations.

Figure 16 — Output Connector Pinouts

17

3.7 Digital I/O Wiring

Both the Digital Inputs and Digital Outputs are optically isolated circuits with no common path between any channel terminal and another channel, or between any channel and the LRP830 power. Because they are independent and floating, the external wiring controls their use. The inputs can be config ured for sensors with a PNP or NPN output. The outputs can be configured in a Sourcing or Sinking configuration. The examples in Figures 17 through 24 show different connections for common input and output devices.

Inputs

The +IN terminal must be at a higher positive potential than the -IN terminal for current to be sensed correctly. The voltage range is 4.5 to 30V between the +IN and the -IN inputs and the maximum current is 25 mA.

Outputs

The output is limited to 30Vdc when off and 500 mA. These are maximum ratings. A device that operates at 200 mA may destroy the output due to inrush current if that current exceeds 500 mA (e.g. an incandescent light). The inductive "kick" (back EMF from a collapsing magnetic field) when a relay is released can impose a voltage higher than 30V and destroy the output transistor (use a backwards diode to clamp the back EMF).

-

18 LRP830-Series Long-Range Passive Reader/Writer

Figure 17 — Input from Sourcing Contact

Figure 17 shows the switch on the high side with the low side grounded. As this is a "Dry" contact (the current is limited to 15 mA) a high quality sealed switch should be used.

Figure 18 — Input from Sinking Contact

Figure 18 shows a switch connected on the low side with the high side con nected to the positive supply. This also requires a high quality sealed contact.

-

19

Figure 19 — Input from NPN Sensor

Figure 19 shows an Open Collector NPN output from a photosensor switch ing to ground. It can be wired as a sinking or low-side contact.

Figure 20 — Input from PNP Sensor

Figure 20 shows an Open Collector PNP output from a photosensor switches to the positive supply. It can be wired as a sourcing or high-side contact.

-

20 LRP830-Series Long-Range Passive Reader/Writer

Figure 21 — Sourcing Output "Contact"

Figure 21 shows a relay connected as a current sourcing "Contact." The re lay is grounded and the +OUT terminal goes to the positive supply. The di ode across the relay coil is essential to protect the output circuit and reduce noise along the wiring. It should be connected at the relay to minimize the length of wiring that could radiate noise. A 1N4001 or similar diode may be used.

Figure 22 — Sinking Output "Contact"

Figure 22 shows a "Contact" sinking current from a relay, the -OUT terminal is grounded and the relay goes to the positive supply. This configuration must also have a diode across the relay coil to protect the circuit and reduce noise.

-

21

Figure 23 — Sinking Output LED Driver

In Figure 23, the LED and current limiting resistor are in series between the positive supply and the +OUT terminal. The -OUT terminal is grounded. The resistor in series with the LED sets the forward current. 1.2K will provide 20 mA LED current when run from 24 Vdc.

Figure 24 — Output to TTL or CMOS

In Figure 24 the output acts as an Open Collector. This will provide a TTL or CMOS compatible signal when a 1K to 10K pull-up to +5 Vdc (the logic supply) is used.

22 LRP830-Series Long-Range Passive Reader/Writer

3.8 Power Requirement

The LRP830 power supply requirement are:

18 to 30Vdc

n

31W maximum power consumption.

n

The maximum current consumption at 24Vdc is 1.3 A.

Power Options

There are three options for powering the LRP830:

Powered from the DeviceNet Bus (default)

n

This is the default configuration for powering the LRP830. If the power available over your DeviceNet network is not sufficient to power the LRP830, use one of the following methods.

Powered via the external power connector

n

This is how you must power the LRP830 if you are not connecting the LRP830 to a DeviceNet network.

n

Powered from an external supply and isolated DeviceNet bus

power (isolated mode)

When the LRP is powered from both sources, the LRP830 will be opto-isolated from the DeviceNet bus.

The DeviceNet interface board draws 20 mA at 24 Vdc from the DeviceNet bus when the LRP830 is powered with this method. Power to the external power connector should conform to the spec ifications given above.

If you choose to power the LRP830 with an external supply via the power connector, you must open the LRP830 and changed jumper and cable loca tions. The following sections describe how to make these changes.

23

-

Power from the DeviceNet Bus

By default, the LRP830 is configured to run with power supplied by the net work. In this mode, there is no galvanic isolation between the DeviceNet wires and the LRP830, and there is no need for a separate power supply.

If you choose to power the LRP830 form the DeviceNet bus, you do not need to make any internal changes to cables and jumpers. Wire power ac cording to the pinouts given for the DeviceNet connector in Figure 14, page

16.

Power via the external supply connector

The LRP830 contains components sensitive to electro-static discharge. Take proper grounding precautions before opening the LRP830.

To change the LRP830 to run in isolated mode:

1. Open the LPR820 by loosening the four captive screws that secure the cover.

2. Refer to Figure 25 and then move the power cable, labeled assembly 10-3110, from connector J7 to J9.

-

Figure 25 — Power Cable Connectors J7 andJ9

24 LRP830-Series Long-Range Passive Reader/Writer

3. The DeviceNet cable, labeled assembly 10-3116, must then ex change places with the power cable, moving from J9 to J7.

4. Referring to Figure 26, locate jumper J1 and move the shunt from pins 4 and 3 to pins 2 and 1.

5. Close the LRP830 and connect a separate +24V power supply to the external power connector shown in Figure 12, page 15.

-

Figure 26 — DeviceNet Board Power Jumper

25

Power from the DeviceNet bus and from an external power supply

When the LRP is powered from both sources, the LRP830 will be opto-isolated from the DeviceNet bus.

The LRP830 contains components sensitive to electro-static discharge. Take proper grounding precautions before opening the LRP830.

To power the LRP830 from an external supply and the DeviceNet bus:

1. Open the LPR820 by loosening the four captive screws that secure the cover.

2. Refer to Figure 25 and then move the power cable, labeled assem bly 10-3110, from connector J7 to J9.

3. The DeviceNet cable, labeled assembly 10-3111, must then exchange places with the power cable, moving from J9 to J7.

4. Make sure that the jumper on J1of the DeviceNet Interface Board connects pins 3 and 4, and then close the LRP830.

5. Connect a separate +24V power supply to the external power connector shown in Figure 12, page 15.

6. Wire the DeviceNet interface and power according to the pinouts given for the DeviceNet connector in Figure 14, page 16.

-

26 LRP830-Series Long-Range Passive Reader/Writer

3.9 LED Indicators

The LRP830 has 16 LEDs indicating status of the LRP830 Reader/Writer, interface communications, and I/O status.

Figure 27 — LRP830 Front with LEDs

27

Table 4 shows these LEDs and their meaning.

Table 4 — LED Indicators

LED Color Indicates

PWR red The LRP830 is receiving power

RF green RF Data Transfer

ANT red Antenna on and tag in field

ERROR Red Unsuccessful RF command (.5 sec. flash)

CONFIG green Successful RF command-1.5sec. flash

ERROR + CONFIG

IN-A yellow Input active

IN-B yellow Input active

IN-C yellow Input active

IN-D yellow Input active

COM1 green/red Incoming data (RX): red

COM2 green/red Incoming data (RX): red

DeviceNet red Data transfer (RX/TX): red

OUT-A green Output active

OUT-B green Output active

OUT-C green Output active

OUT-D green Output active

green/red Entering Operating Mode - 4 alternate flashes

Entering Download Mode via DIP switch 5 (4 flashes)

Configuration Mode initiated (CTRL-D) - Both LEDS flash 4 times Configuration Mode initiated (CTRL-E) - Both LEDS flash 2 times

Outgoing data (TX): green

Additional LED behavior may be observed during certain commands and conditions. This behavior will be indicated as appropriate elsewhere in this manual.

28 LRP830-Series Long-Range Passive Reader/Writer

4 SERIAL AND BUS COMMUNICATIONS

4.1 Serial Interfaces

The LRP830 has RS232 and RS422 available on the COM1 serial port. COM2 is configured for RS232 communications and is reserved for down loading programs to the LRP830 and for setting up the configuration parameters.

Both RS232 and RS422 interfaces are opto-isolated. The RS422 interface is specially suitable for long cable, noisy environment links.

The specification for the COM1 interface follows:

Baud rate: 1200, 2400, 4800, 9600, 19200, 38400 bps

n

Data: 7, 8

n

Parity: Even, Odd, None

n

n Handshake: None, Xon/Xoff

The specification for the COM2 interface follows:

-

n

Baud rate: 1200, 2400, 4800, 9600, 19200 bps

n

Data: 7, 8

n

Parity: Even, Odd, None

n

Handshake: None, Xon/Xoff

29

Digital Board DIP Switch

The digital board is mounted inside the top of the LRP830 enclosure. The first 5 switches of the main board sets the COM1 baud rate, electrical inter face, and the download options for COM2. Switches 6, 7 and 8 are not used and should remain OFF. When switch 1 and 2 are both set ON, the baud rate is set via the Configuration Menu.

-

Figure 28 — Digital Board with DIP Switch

NOTE:

When you set switch 5 ON to enable download, the default parameters will first be restored and saved to the non-volatile memory.

The baud rate configuration on the main board only applies to the RS232 and RS422 serial interfaces. When a Bus Interface (DeviceNet) is selected, the baud rate is set by the Interface Board DIP switches.

30 LRP830-Series Long-Range Passive Reader/Writer

NOTE:

DIP switch 4 must be in the default ON position for the DeviceNet interface to function.

Table 5 Main Board DIP Switch Settings

Download/ Restore

Baud rate Interface

SW 1 SW 2 SW 3 SW 4 SW 5 Settings

ON 19200

ON 38400

ON ON Set from Configuration Menu

ON RS422

ON DeviceNet

ON ON Reserved

Switches 6 through 8 are reserved and must be in the OFF position.

Defaults

9600

RS232

Disabled

ON Enabled Download/ Restore defaults

31

4.2 Bus Interfaces

The COM1 serial port, beside the RS232 or RS422 options, can be config ured as a DeviceNet interface.

The following bus parameters are set by the DIP switches found on the Interface Board.

DeviceNet interface

Bus Rate: 125K, 250K, 500Kbps

n

DeviceNet Node Address (MAC ID)

n

-

Figure 29 — DeviceNet Interface Board DIP Switch

32 LRP830-Series Long-Range Passive Reader/Writer

DeviceNet Interface Board DIP Switch

S1 is an eight position DIP switch. Switches 1 to 6 set the DeviceNet Node address, switches 6 and 7 are reserved and switch 8 sets the bus rate. Table 6 shows these settings.

Table 6 — DeviceNet DIP Switch Settings

DeviceNet Node Switches Bus Rate SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8

ON DeviceNet Node 1 ON DeviceNet Node 2 ON ON DeviceNet Node 3

ON DeviceNet Node 4 ON ON DeviceNet Node 5 ON ON DeviceNet Node 6

ON ON ON DeviceNet Node 7 ON DeviceNet Node 8 ON ON DeviceNet Node 9 ON ON DeviceNet Node 10 ON ON ON DeviceNet Node 11 ON ON DeviceNet Node 12 ON ON ON DeviceNet Node 13 ON ON ON DeviceNet Node 14 ON ON ON ON DeviceNet Node 15

ON DeviceNet Node 16 ON ON DeviceNet Node 17 ON ON DeviceNet Node 18 ON ON ON DeviceNet Node 19 ON ON DeviceNet Node 20 ON ON ON DeviceNet Node 21 ON ON ON DeviceNet Node 22 ON ON ON ON DeviceNet Node 23 ON ON DeviceNet Node 24 ON ON ON DeviceNet Node 25 ON ON ON DeviceNet Node 26 ON ON ON ON DeviceNet Node 27 ON ON ON DeviceNet Node 28 ON ON ON ON DeviceNet Node 29 ON ON ON ON DeviceNet Node 30 ON ON ON ON ON DeviceNet Node 31

Settings

33

Table 5 — DeviceNet DIP Switch Settings (cont.)

DeviceNet Node Switches Bus Rate SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 ON DeviceNet Node 32 ON ON DeviceNet Node 33 ON ON DeviceNet Node 34 ON ON ON DeviceNet Node 35 ON ON DeviceNet Node 36 ON ON ON DeviceNet Node 37 ON ON ON DeviceNet Node 38 ON ON ON ON DeviceNet Node 39 ON ON DeviceNet Node 40 ON ON ON DeviceNet Node 41 ON ON ON DeviceNet Node 42 ON ON ON ON DeviceNet Node 43 ON ON ON DeviceNet Node 44 ON ON ON ON DeviceNet Node 45 ON ON ON ON DeviceNet Node 46 ON ON ON ON ON DeviceNet Node 47 ON ON DeviceNet Node 48 ON ON ON DeviceNet Node 49 ON ON ON DeviceNet Node 50 ON ON ON ON DeviceNet Node 51 ON ON ON DeviceNet Node 52 ON ON ON ON DeviceNet Node 53 ON ON ON ON DeviceNet Node 54 ON ON ON ON ON DeviceNet Node 55 ON ON ON DeviceNet Node 56 ON ON ON ON DeviceNet Node 57 ON ON ON ON DeviceNet Node 58 ON ON ON ON ON DeviceNet Node 59 ON ON ON ON DeviceNet Node 60 ON ON ON ON ON DeviceNet Node 61 ON ON ON ON ON DeviceNet Node 62 ON ON ON ON ON ON DeviceNet Node 63

ON 500k ON ON Reserved

Settings

125k

ON 259k

34 LRP830-Series Long-Range Passive Reader/Writer

5 MENU CONFIGURATION

The LRP830 feature a menu-driven program designed to give convenient access to the serial parameters, restore defaults or change operating modes.

5.1 How to Enter Menu Configuration

Begin by connecting the COM2 port to your PC host (see table below) and running EC that is available on the diskette or from Escort Memory Sys tems’ Web site at www.ems-rfid.com.

LRP830 Standard PC Serial Port

COM2 Pin Number Signal Name DB9 Pin Number Signal Name

RTX2 RX

PRX3 TX

M GND 5 GND

Set the serial parameters to the LRP830 default settings or the last known state of COM2.

The default settings for COM2 are as follows: Baud 9600 Parity None Data bits 8 Stop bits 1 Flow control None

-

If you can not establish communications with COM2, do the following to restore the default values.

1. Place DIP switch five in the ON position and cycle power to the LRP830 or press the reset switch. This will load the default values.

2. Place DIP switch 5 in the OFF position and cycle power once more.

Please refer to Chapter 4, Serial and Bus Communications for more infor mation on the serial interface.

35

-

To enter the Main Board configuration menu, cycle power or press the reset switch, and then press CTRL-D within the first seven seconds of the initial ization. The LRP830 will enter the Configuration Menu. As the LRP830 starts the Configuration program, both the RF and CONFIG LEDs will flash. The Main Board Configuration menu will display with the current software version number together with the DSP firmware version.

****************************************************** LRP830 Standard Program Software V1.7C, June 2000 DSP Firmware V1.7B, August 2000 ******************************************************* [1] Set-up Operating Parameters

[2] Download New Program [3] Download DSP Firmware [4] Exit to Operating Mode

Enter Selection:

5.2 Set-up Operating Parameters

To change the operating parameters of the LRP830, enter 1 at the initial menu. The following menu will be displayed, listing the current settings: The exact appearance of the menu display will depend on the settings you have made, and will be updated when you save your changes.

Serial Port COM1: RS232, 9600, N, 8, 1, No handshake (DIP switches) Serial Port COM2: RS232, 9600, N, 8, 1, No handshake Operating Mode: ABx Standard

RF Communication: Fast Mode

-

[1] Set COM1 Parameters [2] Set COM2 Parameters [3] Set Operating Mode [4] Set RF Communications [5] Restore Factory Defaults [6] Return to Main Menu

Enter Selection:

Enter the number of the sub-menu you wish to enter. When you have made your selection you will be prompted to save your changes to the non-volatile EEPROM. For the new settings to take effect, you must save your changes to the EEPROM and reset the LRP830. If you do not save changes to the EEPROM, the new settings will be effective only until the LRP830 is reset.

36 LRP830-Series Long-Range Passive Reader/Writer

The following sub-menus are presented here in their entirety. Actually the menus will presented one option at time, advancing as you enter selections. Some options shown are dependent on earlier selections.

Set COM1 Parameters

Selecting 1 from the above menu will present the following display for the COM1 parameters. These settings are valid only if you are not using the DeviceNet Interfaces (e.g. DIP switch 4 is in the OFF position). Enter the appropriate number at each prompt. The default values are indicated by an asterisk (*).

*** Set COM1 Parameters *** Baud Rate? [0] 1200 [1] 2400 [2] 4800 [3] 9600* [4] 19200 [5] 38400

Data size? [0] 7 bit [1] 8 bit* Parity? [0] None* [1] Even [2] Odd Handshake? [0] None* [1] Xon/Xoff

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

Set COM2 Parameters

Selecting 2 from the above menu will bring to the following display for the COM2 parameters. Enter the appropriate number at each prompt. The default values are indicated by an asterisk.

*** Set COM2 Parameters *** Baud Rate? [0] 1200 [1] 2400 [2] 4800 [3] 9600* [4] 19200

Data size? [0] 7 bit [1] 8 bit* Parity? [0] None* [1] Even [2] Odd Handshake? [0] None* [1] Xon/Xoff

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

Set Operating Mode

The Set Operating Mode menu allows you to choose the command protocol the LRP830 will use or configure it to automatically enter Continuous Read Mode upon start-up.

37

*** Set Operating Mode *** Command Protocol? [0] ABx Standard* [1] ABx Fast [2] ABx ASCII

Checksum? [0] Disabled* [1] Enabled Power up in Continuous Read Mode? [0] NO [1] Single Tag [2] Multiple Tag Start Address (0 to 47) Length (1 to 48) Delay Between Duplicate Decodes (0 to 60) Raw Read Response? [0] NO [1] CR terminate [2] CR/LF terminate

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

Command Protocol?

The LRP830 offers three modes for the transfer of data and commands. ABx Standard (ABxS) uses only the LSB for tag data while ABx Fast (ABxF) will use both the MSB and the LSB for the passing of data. ABx ASCII (ABxA) mode permits RFID operations using seven bit data packets in the form of printable ASCII characters.

Checksum?

ABx Fast and ABx ASCII also permits you to include a checksum in the command. To use a checksum value with the ABx commands, you must enable the checksum option. It is recommended that you enable the checksum option.

Power up in Continuous Read Mode?

You also have the option of setting the LRP830 to start-up in Continuous Read Mode. When you have configured the LRP830 to function in this manner, you do not issue commands to the LRP830. It will, upon start-up, enter directly into a Continuous Read Mode. Since this bypasses the normal command parameters, you must specify the Continuous Read Mode parameters.

The LRP830 will respond to other commands and resume Continuous Read Mode when completed.

This option will not function over a DeviceNet bus.

If you are using your LRP830 in this mode, you must choose if you want the LRP830 to read a single tag or read multiple tags within the field.

To exit Continuous Read Mode you must either re-enter the configuration menu and select NO from the Power up in Continuous Read Mode option, or issue a Continuous Read command from the host with a read length of 0 as described in Chapter 6, RFID Interface.

38 LRP830-Series Long-Range Passive Reader/Writer

Start Address (0-47)

Enter the tag address where you want the read to begin.

Length (1-48)

Enter the length of the read you wish the LRP830 to perform. Make certain that the length value does not exceed the number of possible addresses fol

lowing the starting tag address. Entering a read length of 0 will disable Con tinuous Read Mode.

Delay Between Identical Decodes (0-60)

The Delay Between Identical Decodes parameters can have a value of 0 to 60 seconds. When the Delay Between Identical Decodes is set to 0, the LRP830 will continuously read AND transmit tag data to the host. This can flood the buffers and cause communication errors and data loss.

Raw Read Response?

If you have selected ABx Fast or ABx ASCII, you have the option of stripping the command protocol from the data and adding a terminator to separate the data packets. You can choose a CR (0DH) or CR/LF (0DH, 0AH) to terminate the data.

Set RF Communication

-

The LRP830 should be configured with the default (0) Fast Mode.

*** Set RF Communication *** RF Communication? [0] Fast Mode* [1] Standard Mode 0 Save Changes to EEPROM? [0] No [1] Yes

Restore Factory Defaults

It is often helpful during troubleshooting to restore the LRP830 to known default values. To do so, select 1from this menu.

*** Restore Factory Defaults *** Restore Factory Default? [0] No [1] Yes

The restored defaults will be saved to the EEPROM. The communication defaults can also be restored by placing the main board DIP switch number 5 in the ON position and then restarting the LRP830. After you have saved any changes, you must re-initialize the LRP830 with switch 5 in the OFF position.

39

Return to Main Menu

When you have completed your configuration, entering 5 will return you to the initial menu. Unsaved changes will be effective until the LRP830 is re set. Saved changes will be loaded automatically the next time the LRP830 is reset.

-

5.3 Download New Program

Before attempting to download new firmware to the LRP830 main board, read the instructions provided in a readme.txt file on the update diskette.

When you select 2 from the Main Menu, the LRP830 will display informa tion on the current program and prompt you to begin the download.

*** Download New Program***

Program Size :21824 Bytes Program Checksum :5AE0H (OK) Free Program Memory :39600 Bytes Flash Write Counter :2 times Press a key to start Downloading

After you have pressed a key, the LRP830 will display:

Send the Intel Hex file. Downloading now.

Send the new program file via your terminal emulation program in ASCII text or Hexadecimal format. Wait 10 seconds after the download is complete before resetting the LRP830.

IMPORTANT:

It is not necessary to download firmware into the unit unless instructed to do so by Escort Memory Systems technical support personnel.

-

5.4 Downloading DSP Firmware

Before attempting to download new firmware to the LRP830 main board, read the instructions provided in a readme.txt file on the update diskette.

When upgrading software in the controller the number and meaning of the configuration parameters may not match between the old and new software. The old settings may not be interpreted properly with the new software. Be

40 LRP830-Series Long-Range Passive Reader/Writer

-

fore downloading another version of software, display and record the current configuration settings. Then download the new software version. Set switch 5 (on the main board) on and apply power to initialize the configuration pa

rameters to their default states. When the LEDs stop flashing, turn Switch 5 to Off and press the reset switch. Enter the Configuration Menu and re-enter any non-default configuration parameters.

When you select 3 from the Main Menu, the LRP830 will prompt you to begin the download.

*** Download DSP Firmware***

Press a key to start Downloading

After you have pressed a key, the LRP830 will display:

Send the Intel Hex file. Downloading now.

Send the new firmware via your terminal emulation program in ASCII text or Hexadecimal format. The firmware will be automatically transferred to the DSP Flash Memory. Wait 10 seconds after the download is complete before resetting the LRP830.

Record: 750 Download OK File Transfer to DSP Blocco 24/24 DSP Flash Programming... New Firmware Transferred to DSP

WARNING: Do not download INTERFACE BOARD firmware to the main board.

IMPORTANT:

It is not necessary to download firmware into the unit unless instructed to do so by Escort Memory Systems technical support personnel.

5.5 Exit to Operating Mode

This option is available if you wish to use temporary, unsaved, configuration parameters. The unsaved options you have selected will be used until the LRP830 is reset and the saved parameters are restored.

41

6 RFID INTERFACE

6.1 Introduction

The LRP830 offer three possible command protocols: ABx Standard, ABx Fast and ABx ASCII. The ABx Standard format is word-based and is com patible with most existing RFID systems by Escort Memory Systems. The ABx Fast protocol is a byte-based packet structure that permits command execution with fewer total bytes transferred. The ABx ASCII protocol is also a byte-based format that permits the execution of RFID commands using a seven-bit ASCII character set.

The ABx Fast protocol is the most efficient and therefore recommended by Escort Memory Systems. Table 7 lists the ABx commands available for the LRP830.

The LRP830 command set is made of two subsets: the ‘Non-Anticollision’ commands and the ‘Anticollision’ commands. The Anticollision commands allow you to manage the multiple-tags-in-field capability of the LRP system.

Command Timeout

-

Most commands have a timeout value that is used to limit the time the LRP830 will attempt to complete the specified operation. This value is given in 1 ms increments with a maximum value of 65,534 ms. A timeout value of 0 will generate a syntax error.

Between 500ms and 1000ms is recommended for a timeout value for single tag commands. Shorter timeouts may result in diminished range. A 30ms timeout value is the shortest allowable timeout and should only be used for short range, single tag command applications. Multiple tag commands will require longer timeout values. For time critical applications the timeout value should be tested to obtain the maximum performance value. A longer timeout value does not mean that the command will take any longer to exe cute if the tag being addressed is in the field, it only represents the period of time (in milliseconds) the unit will attempt to execute the command. If the tag is present, the response time to execute the command will be the same whether the timeout is 100ms or 10,000ms.

-

42 LRP830-Series Long-Range Passive Reader/Writer

NOTE:

The delay between the characters of the command packet the LRP830 can not be longer than 200 ms.

Table 7 - ABx Command Set Listing

Non-Anticollision Commands

04 Hex Fill Tag

05 Hex Block Read

06 Hex Block Write

07 Hex Read Tag Serial Number

08 Hex Tag Search

0D Hex Continuous Block Read*

10 Hex Set Output

11 Hex Input Status

Anticollision Commands

84 Hex Fill Tag All*

85 Hex Block Read All*

86 Hex Block Write All*

87 Hex Read Tag Serial All*

88 Hex Tag Search All*

89 Hex EAS Set/Reset

8A Hex EAS Start/Stop

8D Hex Continuous Read All*

8E Hex Memory Lock

94 Hex SN Fill

95 Hex SN Block Read

96 Hex SN Block Write

97 Hex SN Block Read All*

-

*These commands can not be used with DeviceNet.

43

DeviceNet and Anticollision ABx Limitations

The LRP830 does not support the following “All” commands in multiple tag-in-field mode (i.e. Anticollision Index is not 0) over a DeviceNet interface:

Command Number Command

84H Fill Tag All

85H Block Read All

86H Block Write All

87H Read Tag SN All

88H Tag Search All

8DH Continuous Read All

97H SN Block Read All

The entire command set is available for point-to-point serial communica tions.

-

44 LRP830-Series Long-Range Passive Reader/Writer

6.2 ABx Error Codes

Non-Anticollision Error Codes

The LRP830 will return an error if it encounters a fault during operation. Table 7 lists the possible error codes in Hexadecimal format.

Table 7 — Non-Anticollision Error Codes

Error Code Description 04H Fill Operation has failed 05H Block Read has failed 06H Block Write has failed 08H Search Tag Operation failed 21H Input Command does not match pre-defined format (syntax error)

Additionally there are internal DSP errors, F1H through F5H, for use by Escort Memory Systems technical support.

ABx Standard

ABxS error codes are returned in the LSB of the second register passed to the PLC. The format of the error response is shown below.

MSB LSB Remarks

AAH FFH Command Error

00H XXH Error Code

FFH FFH Message Terminator

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

45

ABx Fast

The format of the error response is shown below.

Field Bytes Contents

Header <STX><STX>

Response Size 00H

Error Flag FFH

Error Code XXH

Checksum XXH

Terminators <ETX> 03H

02H

A Block Write fail error message would appear as: 0202 0002 FF06 F803H.

ABx ASCII

The format of the error response is shown below.

Field # of ASCII

characters

Header <STX><STX> 2

Response Size 4 Packet length in bytes excluding the header, response size,

Error Flag 2 FFH

Error Code 2 XXH - see Table 7 for details

Checksum 2 XXH - optional checksum

Terminators <ETX> 1 <ETX> 03H

Contents

<STX> 02H

checksum and terminator bytes

In ABx ASCII format the response size is the number of hex values and not the number of ASCII characters used to represent the hex value.

A Block Write fail error message would appear as an ASCII character string: <STX><STX>0002FF06F8<ETX>.

In hexadecimal the commands appears as: 02H 02H 30H 30H 30H 32H 46H 46H 30H 36H 46H 38H 03H

46 LRP830-Series Long-Range Passive Reader/Writer

Anticollision Status Byte

When the anticollision commands encounter a fault condition they indicate the set a bit in a STATUS byte returned in the response. The format of the response is otherwise the same as a successful response.

The STATUS byte is defined as follows:

76543210

Antenna

Failure

R/W Error Collisions Internal

Error

Timeout Verify

Error

Reserved Reserved

Some of the conditions are the same as found in the non-anticollision com

-

mands, other are new and relate only to the anticollision.

If any of the flag bits of the returned Status are set, then that condition occurred during the command execution. Multiple conditions can occur in the same command.

Antenna There is an error at the antenna Failure R/W error Error during the tag memory access Collision Collisions detected: more than one tag in the field answered to

the LRP830 at the same time, meaning a higher Anticollision Index probably needs to be set

Internal Error Internal error in low-level firmware

(contact Escort Memory Systems technical assistance) Timeout Timeout expired Verify Error Set when re-read verification fails

Syntax Errors

Syntax errors (error code 21H) will be returned in the same format as described for the non-anticollision commands.

47

6.3 Anticollision Commands

Family Interrogation

The anticollision commands always have a Family ID and an Anticollision Index as parameters. These parameters manage the read/writes when multi ple tags are in the same reading field. The Family ID and Anticollision Index can be used separately or together. If the Family ID is zero, that feature is disabled, if the Anticollision Index is zero, this feature (and multiple tag-in-field) is disabled as well.

If both the features are disabled, the commands operate exactly the same as the Non-Anticollision commands.

Family ID

The Family ID is a 1 byte field in the LRP tag memory at address 0. When the Family ID parameter is set to zero, the command is broadcast to all the tags in the field. On the other hand, if it is not equal to zero, only the tags with the specified Family ID in byte 1will respond to the LRP830.

This feature can help in implementing a multi-level organization of the tags, by permitting the selective reading of tags by Family ID. This gives faster access to the tags than by using Anticollision Index alone. As previously noted, Family ID and the Anticollision Index can be used together for increased efficiency.

-

When using the Family ID feature, the first byte of tag memory is reserved, and thus only 47 bytes are allowed to be used. When the feature is disabled, 48 bytes are available for user data.

For this reason, in the read and write commands, once the parameter Family ID is not equal to zero, the addresses can go from 1 to 47, and the size from 0 to 47. However, when the Family Code is zero, the addresses can start from 0, and the size can be up to 48.

In order to initialize a tag with a chosen Family ID, byte 0 in the tag must be set to that value by means of a Block Write or a Block Write All command.

48 LRP830-Series Long-Range Passive Reader/Writer

Anticollision Index

The Anticollision Index controls the tag reading algorithm to achieve the fastest reading speed for the number of tags expected in the reading field at any given moment. It also can disable the multiple tag-in-field feature when set to 0.

The Anticollision Index should be set in relation to the maximum number of tags possibly present in the reading field at one time. Setting the Anticollision Index higher increases the number of tags that will be expected to be read in the field. Lowering the Index speeds up the tag read operation. Selecting the Anticollision Index is therefore a tradeoff choice between the number of tags in the reading field, and the time required to read/write to them. Regardless of the index setting, ALL tags present will be read. The in dex simply makes the process more efficient.

None of the Anticollision Index values will absolutely limit the number of tags that can be read by the LRP830. The following table can assist you in setting the Index value, but tests should be done to find the best value. The allowed values are from 0 to 7.

Anticollision Index Max number of tags

0 1 (*) 1 2-4 2 4-8 3 8-16 4 16-32 5 32-64 6 64-128 7 >128

(*) anticollision disabled

-

Some commands return or have as a parameter, the Serial Number (SN). The tag serial number is a unique read-only, 64 bit (8 bytes) code in the tag memory. SN commands can be used to selectively write to a specific tag, identified by the SN. A target tag can be identified with a previous SN read command.

Note that the anticollision commands, except SN Block Write, SN Fill and Tag Search All, will return a response packet only after the timeout is ex

pired. If the command has the Anticollision Index set to 0, then a response will be returned after the first successful operation.

49

The Anticollision Commands return a successful response whenever the op eration has successfully been completed on at least 1 tag. They will return an Error Response when no tag, as permitted by the Family ID and Anticollision Index, can be found in the antenna field.

-

Note also that all the start addresses, byte lengths and packet sizes are ex pressed in 2 byte words, in order to be compatible with the HMS commands and to allow future developments.

-

50 LRP830-Series Long-Range Passive Reader/Writer

6.4 ABx Standard Protocol

6.3 ABx Standard Protocol

The ABx standard is a binary protocol, word (2-byte) oriented, so the syntax table reports the Most Significant Byte (MSB) and the Least Significant Byte (LSB). In the serial transmission, the MSB is transmitted first.

ABxS Command 4 (04H): Fill Tag

DESCRIPTION Fill an RFID tag with a one byte value over multiple contiguous addresses.

DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses.

The fill function requires one data value byte, a starting address, and a fill length. It will then proceed to fill the tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. When Fill Length is set to 0, the LRP830 will write fill data from the start address to the end of the tag's memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error.

Field Remarks

Command Command number in hex preceded by AAH

Start Address The tag address where the fill will start

Fill Length The number of tag addresses to be filled in bytes

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

Data Value Byte The byte to be used as fill

Message Terminator FFFFH

51

EXAMPLE Writes 'A' (41H) to the tag starting at address 0005H for the following next consecutive 10 bytes. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the configuration.

Command from Host

MSB LSB Remarks

AAH 04H Perform Command 4 00H 05H Start Address = 0005H 00H 0AH Fill Length= 10 bytes

(0064H) 07H D0H Timeout value 00H 41H Data Value Byte = 41H FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 04H Command echo FFH FFH Message Terminator

52 LRP830-Series Long-Range Passive Reader/Writer

ABxS Command 5 (05H): Block Read

DESCRIPTION Read a block of data from an RFID tag.

DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error.

The Block Read command consists of a start address and length, followed by the message terminator, FFFFH, as shown below. If the read range ex ceeds the last tag address, the LRP830 will return error message 21H, in

-

valid format.

The data read from the tag is returned in the LSB of the register, and the MSB is always 00H.

Field Remarks

Command Command number in hex preceded by AAH

Start Address The tag address where the read will start

Read Length The number of tag addresses to be read

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

Message Terminator FFFFH

53

EXAMPLE: Reads 8 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Read.

Command from Host

MSB LSB Remarks

AAH 05H Perform command 5 00H 01H Start Address = 0001H 00H 08H Read Block Length = 8 bytes

(0008H) 07H D0H Timeout Value FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 05H Command echo

00H 52H Read Data1=52H

00H 46H Read Data2=46H

00H 49H Read Data3=49H

00H 44H Read Data4=44H

00H 20H Read Data5=20H

00H 54H Read Data6=54H

00H 61H Read Data7=61H

00H 67H Read Data8=67H

FFH FFH Message Terminator

54 LRP830-Series Long-Range Passive Reader/Writer

ABxS Command 6 (06H): Block Write

DESCRIPTION Write a block of data to an RFID tag.

DISCUSSION This command is used to write segments of data to contiguous areas of tag memory. It is capable of transferring up to 48 bytes of data transferred from the Host with one command. The timeout value is given in 1 msec incre

ments and can have a value of 1EH to FFFEH (65,534 ms). When the time out is set to 0, the LRP830 will return a syntax error.

The Block Write command consists of a start address followed by the data stream to be written to the RFID tag. If the write range exceeds the last tag address, the LRP830 will return error message 21H, invalid format. The LRP830 will also return an error if the write length is 0.

The data to be written to the tag is contained in the LSB of the register, and the MSB is always 00H.

Field Remarks

Command Command number in hex preceded by AAH

Start Address The tag address where the write will start

Write Length The number of tag addresses to be written to in bytes

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

Write Data The data to be written

Message Terminator FFFFH

-

55

EXAMPLE: Writes 4 bytes of data to the tag starting at address 0020H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Write.

Command from Host

MSB LSB Remarks

AAH 06H Perform Command 6

00H 20H Start Address = 0020H

00H 04H Write Length = 4 bytes

07H D0H Timeout Value

00H 52H Write Data1=52H

00H 46H Write Data2=46H

00H 49H Write Data3=49H

00H 44H Write Data4=44H

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 06H Command echo

FFH FFH Message Terminator

56 LRP830-Series Long-Range Passive Reader/Writer

ABxS Command 7 (07H): Read Tag Serial Number

DESCRIPTION Retrieve the eight-byte tag serial number.

DISCUSSION Each LRP tag has an unique (2

64

possible numbers) serial number. This number can not be changed and is not part of the 48 available data bytes. Tag ID will be return in the LSB only, with the MSB as 00H.

Field Remarks

Command Command number in hex preceded by AAH

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Message Terminator FFFFH

EXAMPLE: This example will wait until a tag is in range and then reads the 8-byte serial number. In this example the SN is 1E6E3DC200000000H in hexadecimal.

Command from Host

MSB LSB Remarks

AAH 07H Perform Command 7

07H D0H Timeout

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 07H Command Echo

00H 1EH First SN byte

00H 6EH Second SN byte

00H 3DH Third SN byte

00H C2H Fourth SN byte

00H 00H Fifth SN byte

00H 00H Sixth SN byte

00H 00H Seventh SN byte

00H 00H Eighth SN byte

FFH FFH Message Terminator

57

ABxS Command 8 (08H): Tag Search

DESCRIPTION Check to see if there is an RFID tag in the LRP830 field.

DISCUSSION This command will activate LRP830 to "look" for a tag in the RF field. If the LRP830 finds a tag it will return a command echo to the host. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error. If no tag is present, it will return an error message. See Section 6.2 for more information on error codes.

Field Remarks

Command Command number in hex preceded by AAH

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Message Terminator FFFFH

EXAMPLE Checks for an RFID tag in the RF field. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Tag Search.

Command from Host

MSB LSB Remarks

AAH 08H Perform Command 8

07H D0H Timeout Value

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 08H Command echo

FFH FFH Message Terminator

58 LRP830-Series Long-Range Passive Reader/Writer

ABxS Command D (0DH): Continuous Block Read

DESCRIPTION When in Continuous Block Read mode, the LRP830 sends block reads con tinuously to any tag in range of the antenna. When a tag enters the RF field, it is read and the data passed to the host computer. The LRP830 continues to read the tag but will not send the same data to the host until the tag has been outside the RF field for a specified time period. This Delay Between Identi

cal Decodes feature prevents redundant data transmissions when the LRP830 is in Continuous Block Read mode.

DISCUSSION The initiate/cancel Continuous Block Read command contains three param eters: read length, start address, and delay between identical decodes. The read length parameter switches the mode. Any valid, non-zero length (1-48) will set the LRP830 into Continuous Block Read mode. A read length value of 00H will turn Continuous Block Mode off.

The Delay Between Identical Decodes value can have a value of 0 to 60 seconds. When the Delay Between Identical Decodes is set to 0, the LRP830 will continuously read AND transmit tag data to the host. This can flood the buffers and cause communication errors and data loss.

-

If the LRP830 receives other commands from the host, it will execute them and then resume Continuous Block Read mode. To exit Continuous Block Read mode, issue the command with a read length of 0.

In Continuous Block Read mode, the LEDs will display as follows:

LED Behavior Description

ANT LED ON Assumes the Antenna is powered and functioning

CONFIG LED BLINK Tag entered the RF field

RF LED ON A tag has been read and is still in the field

RF LED OFF A read tag has been out of range for the specified time

NOTE:

This command can not be used over a DeviceNet interface.

59

The command is formatted as follows.

Field Remarks

Command Command number in hex preceded by AAH

Start Address 2 byte value for the start address in the tag

Read Length 2 byte value for the block read length

Delay Between Identical Decodes

Message Terminator FFFFH

Time the tag must be out of the antenna range before the LRP830 will transmit data again from that tag. Value is expressed in 1 second units.

EXAMPLE This example places the LRP830 in Continuous Block Read mode and reads 8 bytes of data from the tag starting at address 0001H. A delay between identical reads of 2 seconds (0002H = 2 x 1 second increments) is set.

Command from Host

MSB LSB Remarks

AAH 0DH Perform Command D

00H 01H Start address

00H 08H Read 8 bytes

00H 02H 2 second delay

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 0DH Command echo

FFH FFH Message Terminator

The LRP830 will first return an acknowledgment of the command followed by a response containing read data when a tag enters the antenna field.

Response from LRP830

MSB LSB Remarks

AAH 0DH Command echo

00H 52H Read data byte 1

00H 46H Read data byte 2

00H 49H Read data byte 3

00H 44H Read data byte 4

00H 41H Read data byte 5

00H 20H Read data byte 6

00H 54H Read data byte 7

00H 61H Read data byte 8

FFH FFH Message Terminator

60 LRP830-Series Long-Range Passive Reader/Writer

To exit Continuous Block Read mode, Send the command with the read length variable set to 0 as shown below. The value of the other variables are not considered.

Command from Host

MSB LSB Remarks

AAH 0DH Perform Command D

00H 01H Start address

00H 00H Read 0 bytes/end mode

00H 02H 2 second delay

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 0DH Command echo

FFH FFH Message Terminator

61

ABxS Command 10 (10H): Set Output

DESCRIPTION Set the levels of the output lines and output LEDs "A" through "D."

DISCUSSION This command uses bit logic to set the levels of the digital output lines. The four least significant bit toggle the output levels;1=ONand0=OFF.The following chart shows the hex values for all output high combinations. To reset all output, issue the command with 00H in the second word.

MSB LSB Remarks LSB Bit 3

Output D

00H 00H Reset A, B, C, D 0000

00H 01H Set Output A - Reset B, C, D 0001

00H 02H Set Output B - Reset A, C, D 0010

00H 03H Set Output A, B - Reset C, D 0011

00H 04H Set Output C - Reset A, B, D 0100

00H 05H Set Output A, C - Reset B, D 0101

00H 06H Set Output B, C - Reset A, D 0110

00H 07H Set Output A, B, C - Reset D 0111

00H 08H Set Output D - Reset A, B, C 1000

00H 09H Set Output A, D - Reset B, C 1001

00H 0AH Set Output B, D - Reset A, C 1010

00H 0BH Set Output A, B, D - Reset C 1011

00H 0CH Set Output C, D - Reset A, B 1100

00H 0DH Set Output A, C, D - Reset B 1101

00H 0EH Set Output B, C, D - Reset A 1110

00H 0FH Set Output A, B, C, D 1111

Field Remarks

Command Command number in hex preceded by AAH

Output Pattern Hex value for the bit output settings

Message Terminator FFFFH

LSB Bit 2 Output C

LSB Bit 1 Output B

LSB Bit 0 Output A

62 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE The following example sets Output B only and resets A, C, and D.

Command from Host

MSB LSB Remarks

AAH 10H Perform Command 10

00H 02H Set Output B

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 10H Command echo

FFH FFH Message Terminator

63

ABxS Command 11 (11H): Input Status

DESCRIPTION Retrieves the input line levels.

DISCUSSION This command uses bit logic to monitor the levels of the digital input lines. The four least significant bit display the output levels;1=ONand0=OFF. The following chart shows the hex values for all input conditions that can be returned in word 2 of the response.

MSB LSB Remarks LSB Bit 3

Input D

00H 00H Inputs A, B, C, D, OFF 0000

00H 01H Input A, ON - B, C, D, OFF 0001

00H 02H Input B, ON - A, C, D, OFF 0010

00H 03H Input A, B, ON - C, D, OFF 0011

00H 04H Input C, ON - A, B, D, OFF 0100

00H 05H Input A, C, ON - B, D, OFF 0101

00H 06H Input B, C, ON - A, D, OFF 0110

00H 07H Input A, B, C, ON - D, OFF 0111

00H 08H Input D, ON - A, B, C, OFF 1000

00H 09H Input A, D, ON - B, C, OFF 1001

00H 0AH Input B, D, ON - A, C, OFF 1010

00H 0BH Input A, B, D, ON - C, OFF 1011

00H 0CH Input C, D, ON - A, B, OFF 1100

00H 0DH Input A, C, D, ON - B, OFF 1101

00H 0EH Input B, C, D, ON - A, OFF 1110

00H 0FH Input A, B, C, D, ON 1111

Field Remarks

Command Command number in hex preceded by AAH

Message Terminator FFFFH

LSB Bit 2 Input C

LSB Bit 1 Input B

LSB Bit 0 Input A

64 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE The following example shows only Input B is ON.

Command from Host

MSB LSB Remarks

AAH 11H Perform Command 11

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 11H Command echo

00H 02H Input B ON

FFH FFH Message Terminator

65

ABxS Command 84 (84H): Fill Tag All

DESCRIPTION Fill all RFID tags-in-field or all tags in the same family with a one byte value over multiple contiguous addresses.

DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses. All tags present in the antenna field with the specified Family ID will be affected by this command.

The fill function requires one data value byte, a starting address, and a fill length. It will then proceed to fill the tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes.

The Fill Length must be set to a non-zero value (1-48). The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the Anticollision Index is not zero (multiple tag-in-field enabled), the LRP830 will return a response after the timeout expires. If the Anticollision Index is 0, a response is returned when a successful operation is performed on 1 tag or when the timeout has expired. When the timeout is set to 0, the LRP830 will return a syntax error.

Field Remarks

Command Command number in hex preceded by AAH

Family Code Tag Family ID - 00H = all tags

Anticollision index Number of tags expected

Start Address The tag address where the fill will start

Fill Length The number of tag addresses to be filled (1-48)

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Data Value Byte The byte to be used as fill

Message Terminator FFFFH

NOTE:

This command can not be used over a DeviceNet interface.

66 LRP830-Series Long-Range Passive Reader/Writer

A response to a successful command will follow this form.

Field Remarks

Command Echo Command number in hex preceded by AAH

Number of Tags filled Number of tags found in the field and filled

Command Status One byte Error status

Message Terminator FFFFH

EXAMPLE Writes 'A' (41H) to all tags of family 01H, starting at tag address 0005H for the following next consecutive 40 bytes, with four to eight tags expected in the field. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Fill All Tag. The Anticollision Index is set to 2 so 4 to 8 tags will be expected. Four tags are successfully filled within the timeout.

Command from Host

MSB LSB Remarks

AAH 84H Perform Command 84

01H 02H Tag Family 01/ Index 2

00H 05H Start Address

00H 28H Fill Length

07H D0H Timeout

00H 41H Fill byte

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 84H Command Echo

04H 08H Ntag/Status

FFH FFH Message Terminator

67

ABxS Command 85 (85H): Block Read All

DESCRIPTION Read a block of data from all RFID tags-in-field or those with the specified Family ID.

DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error 21H.

The Block Read All consists of Tag Family ID and an Anticollision Index, a start address and length, followed by a timeout value and the message terminator. If the read length exceeds the last tag address, the LRP830 will return a syntax error message 21H.

The data read from the tag is returned in the LSB of the register, and the MSB is always 00H.

A special termination packet (AAH FFH) is sent after the timeout expires. When the Anticollision Index is not zero (multiple tag-in-field enabled), the LRP830 will return a response after the timeout expires. If the Anticollision Index is 0, the command returns after the successful operation on one tag or when the timeout expires. No termination packet is sent after a successful operation when the Anticollision Index set to 0.

Field Remarks

Command Command number in hex preceded by AAH

Tag Family Tag Family ID - 00H = all tags

Anticollision index Number of tags-in-field expected

Start Address The tag address where the read will start

Read Length The number of tag addresses to be read

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Message Terminator FFFFH

NOTE:

This command can not be used over a DeviceNet interface.

68 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE: Reads 4 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Read All. The Family ID byte is set to zero so all tags will be read. The Anticollision Index is set to 2 so 4 to 8 tags will be expected. Three tags respond with read data.

Command from Host

MSB LSB Remarks

AAH 85H Perform Command 85

00H 02H Tag Family 00/ Index 2

00H 01H Start Address

00H 04H Read Length

07H D0H Timeout

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 85H Command Echo/Tag 1

00H 30H Data byte 1/Tag 1

00H 31H Data byte 2/Tag 1

00H 32H Data byte 3/Tag 1

00H 33H Data byte 4/Tag 1

FFH FFH Terminator/ Tag 1

AAH 85H Command Echo/Tag 2

00H 40H Data byte 1/Tag 2

00H 41H Data byte 2/Tag 2

00H 42H Data byte 3/Tag 2

00H 43H Data byte 4/Tag 2

FFH FFH Terminator/ Tag 2

AAH 85H Command Echo/Tag 3

00H 34H Data byte 1/Tag 3

00H 35H Data byte 2/Tag 3

00H 36H Data byte 3/Tag 3

00H 37H Data byte 4/Tag 3

FFH FFH Terminator/ Tag 3

AAH FFH Termination Packet

03H 08H Ntag/Status

FFH FFH Terminator Message

69

ABxS Command 86 (86H): Block Write All

DESCRIPTION Write a block of data to all RFID tags or all tags with the same Family ID.

DISCUSSION This command is used to write segments of data to contiguous areas of tag memory. It is capable of transferring up to 48 bytes of data transferred from the Host with one command. The timeout value is given in 1 msec incre

ments and can have a value of 1EH to FFFEH (65,534 ms). When the time out is set to 0, the LRP830 will return a syntax error.

The Block Write consists of a Tag Family ID and an Anticollision Index, start address followed by the data stream to be written to the RFID tag. If the write range exceeds the last tag address, the LRP830 will return error mes

-

sage 21H, invalid format.

The data to be written to the tag is contained in the LSB of the register, and the MSB is always 00H.

The LRP830 returns a response when the timeout expires. If the Anticollision Index is 0 the command returns a response after the successful operation on 1 tag, or when the timeout expires.

-

Field Remarks

Command Command number in hex preceded by AAH

Family ID Tag Family ID - 0 = all tags

Anticollision Index Number of tags-in-field expected

Start Address The tag address where the write will start

Write Length The number of tag addresses to be written to in bytes

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Write Data The data to be written (1-48 bytes)

Message Terminator FFFFH

NOTE:

This command can not be used over a DeviceNet interface.

70 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE: Writes 4 bytes of data, starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Write. The Family ID byte is set to 2, so all tags with Family ID of 2 will be written to (four tags in this example). The Anticollision Index is set to 2 so 4 to 8 tags are expected in the field.

Command from Host

MSB LSB Remarks

AAH 86H Perform Command 86

02H 02H Tag Family 02/ Index 2

00H 01H Start Address

00H 04H Write Length

07H D0H Timeout

00H 40H Data byte 1

00H 41H Data byte 2

00H 42H Data byte 3

00H 43H Data byte 4

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 86H Command Echo

04H 08H Ntags/Status

FFH FFH Message Terminator

71

ABxS Command 87 (87H): Read Tag SN All

DESCRIPTION This command retrieves the 8-byte tag serial number from all tags or those with the specified Family ID number.

DISCUSSION Each LRP tag has an unique (2

64

possible numbers) serial number. This number cannot be changed and is not part of the 48 available data bytes. The Tag SN is returned in the LSB only, with the MSB as 00H.

The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error. A special termination packet (starting with AAH FFH) is sent when the timeout expires. If the Anticollision Index is 0, a response is returned after successful operation to 1 tag or after the timeout has ex

pired. No termination packet is sent after a successful operation when the Anticollision Index set to 0.

Field Remarks

Command Command number in hex preceded by AAH

Family ID Tag Family ID - 00H = all tags

Anticollision Index Number of tags-in-field expected

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Message Terminator FFFFH

NOTE:

This command can not be used over a DeviceNet interface.

72 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE: This example will read the 8-byte serial number from Tag Family 2. The Anticollision Index of 2 sets the number of expected tags at 4-8. In this ex ample the SN for the found tag is 1E6E3CD200000000H in hexadecimal. Multiple tags will return a complete response packet for each tag.

-

Command from Host

MSB LSB Remarks

AAH 87H Perform Command 87

02H 02H Tag Family 02 / Index 2

07H D0H Timeout

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 87H Command Echo

00H 1EH First SN byte

00H 6EH Second SN byte

00H 3CH Third SN byte

00H D2H Fourth SN byte

00H 00H Fifth SN byte

00H 00H Sixth SN byte

00H 00H Seventh SN byte

00H 00H Eighth SN byte

FFH FFH Message Terminator

AAH FFH Termination Packet

01H 08H Ntags/Status

FFH FFH Message Terminator

73

ABxS Command 88 (88H): Tag Search All

DESCRIPTION Check to see if there is an RFID tag in the LRP830 field.

DISCUSSION This command will activate LRP830 to "look" for a tag in the RF field. As soon as the LRP830 finds a tag it will return a command echo to the host. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error. If no tag is present, it will return an error message. See Section 6.2 for more information on error codes.

The number of tags returned can be either 1 (tag found) or 0 (timeout ex

-

pired without having found a tag).

Field Remarks

Command Command number in hex preceded by AAH

Family ID Tag Family ID - 00H = all tags

Anticollision Index Number of tags-in-field expected

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Message Terminator FFFFH

NOTE:

This command can not be used over a DeviceNet interface.

EXAMPLE Checks for an RFID tag in the RF field. A timeout of 1 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Tag Search All. The Family ID is set for any tag, and the Anticollision Index is set to expect 4-8 tags. One tag is found and the command is successful.

Command from Host

MSB LSB Remarks

AAH 88H Perform Command 88

01H 01H Family ID / Index 2

07H D0H Timeout

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 88H Command Echo

01H 00H Ntags/Status

FFH FFH Message Terminator

74 LRP830-Series Long-Range Passive Reader/Writer

ABxS Command 89 (89H): EAS Set/Reset All

DESCRIPTION Sets or resets the EAS feature in tag memory for all tags in range, and of the specified Family, when the command is issued.

DESCRIPTION The commands contains a 1 byte parameter that enables or disables the EAS feature in tags that receive the command. When the EAS Set/Reset All com mand is issued, the LRP830 responds with the number of tags affected (Ntag). If the LRP830 returns a 0 for Ntag it means that no tags were set or reset by the command.

When multiple tag-in-field is enabled (Anticollision Index is not 0), the LRP830 will return a response when the timeout period expires. When mul tiple tag-in-field is disabled, the LRP830 will return a response when it reads a tag or the timeout expires.

Field Remarks

Command Command number in hex preceded by AAH

Family ID Tag Family ID - 00H = all tags

Anticollision Index Number of tags expected

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Set/Reset 1 = Set, 0 = Reset EAS

Message Terminator FFFFH

-

EXAMPLE This example assumes that the tags-in-field are not enabled for the EAS feature. It will enabled the EAS feature for tags with Family ID 09H. The Anticollision Index is 2, so 4-8 tags are expected in the field. When the com mand is issued, 5 tags with Family ID 09H are found and enabled for EAS.

Command from Host

MSB LSB Remarks

AAH 89H Perform Command 89

09H 02H Family ID/Anticollision Index 2

07H D0H Timeout

00H 01H Set EAS

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 89H Command Echo

05H 08H Ntags/Status

FFH FFH Message Terminator

75

-

ABxS Command 8A (8AH): EAS Start/Stop

DESCRIPTION If are using the EAS feature in your application, the EAS Start/Stop com

-

mand enters and exits the LRP830 from EAS mode.

DISCUSSION When EAS mode has been started, the LRP830 will return a response when one or more EAS-enabled tags have entered the antenna field. It will send a second response when all EAS-enabled tags have exited the field. The com mand contains a control byte that toggles EAS: 1 = start, 0 = stop. A Family ID can be set so that only EAS-enabled tags from the specified Family trig ger EAS responses. The Anticollision Index is ignored and should be set to 00H for this command.

The EAS mode also controls the CONFIG, ERROR and RF LEDs. The following table:

LED(s) Behavior Description

CONFIG, ERROR, RF LEDs

RF LED ON EAS-enabled tag entered field. LED will remain ON until all EAS tags

ERROR LED BLINKS Last EAS tag left the field.

OFF No EAS-enabled tag in field

have left the field.

-

IMPORTANT:

EAS mode prevents any other commands from being acknowledged or exe cuted until EAS has been stopped.

Field Remarks

Command Command number in hex preceded by AAH

Family ID Tag Family ID - 00H = all tags

Start/Stop 1 = start, 0 = stop

Message Terminator FFFFH

76 LRP830-Series Long-Range Passive Reader/Writer

-

EXAMPLE This example starts EAS mode. Three responses follow. The first is a com mand acknowledgment. The LRP830 sends the second when the first EAS-enabled tag enters the field, A third response is sent when field is clear of EAS-enabled tags. Family ID is set to 0 so that any EAS-enabled tag will trigger responses.

-

Command from Host

MSB LSB Remarks

AAH 89H Perform Command 89

00H 00H Family ID/null byte

00H 01H Start/Stop

FFH FFH Message Terminator

ACT Response from LRP830

MSB LSB Remarks

AAH 89H Command Echo

FFH 00H Ntag/Status

FFH FFH Message Terminator

When an EAS-enabled tag enters the antennas’ field, the LRP830 responds with an EAS tag-in-field response.

Tags-in-Field Response from LRP830

MSB LSB Remarks

AAH 89H Command Echo

01H 00H Ntag/Status

FFH FFH Message Terminator

When all EAS-enabled tags have left the field, the LRP830 will send the fol lowing response.

EAS Tags Left Field Response from LRP830

-

MSB LSB Remarks

AAH 89H Command Echo

00H 00H Ntag/Status

FFH FFH Message Terminator

77

ABxS Command 8D (8DH): Continuous Read All

DESCRIPTION Starts and stops Continuous Read All mode for multiple tags.

DISCUSSION Continuous Read All mode is set by the length byte. To start Continuous Read All mode, send the command with valid, non-zero value for the length of the read (1-48). Stop the mode by sending the command with a read length of 0.

While in this mode, any other command can be issued and it will be handled properly. After processing the new command, the LRP will resume the Con tinuous Read All mode.

The command has a parameter, tag delay, that can prevent multiple reads of the same tag. A tag is not read a second time until a specified number of tags have been read since it was last read. Allowed value are from 0 to 255 (FFH), where 0 means the tag can be re-read anytime. When Continuous Read All mode is interrupted with other commands, the tag delay count is stopped during execution of the other commands and then resumed.

The LRP830 will respond with an acknowledge packet followed by data packets for each tag read.

-

CONFIG LED blinks after each packet transmission.

Field Remarks

Command Command number in hex preceded by AAH

Family ID Tag Family ID - 00H = all tags

Anticollision Index Number of tags expected

Start Address Tag address for the start of the read

Read Length 1-48 = start, 0 = stop

Tag Delay Number of tags that must be read before the same tag will be read again

Message Terminator FFFFH

(0-225)

NOTE:

This command can not be used over a DeviceNet interface.

78 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE Reads 4 bytes of data from the tag starting at address 0001H. The Family ID byte is set to zero so all tags will be read. The Anticollision Index is set to 2 so 4 to 8 tags will be expected. The Tag Delay is set to 20 (14H). Three tags respond with read data.

Command from Host

MSB LSB Remarks

AAH 8DH Perform Command 8D

00H 02H Tag Family 00/ Index 2

00H 01H Start Address

00H 04H Read Length

00H 14H Tag Delay

FFH FFH Message Terminator

ACK Response from LRP830

MSB LSB Remarks

AAH 8DH Command Echo

FFH FFH Message Terminator

After the LRP830 sends the acknowledgment, it will send the read data from the 3 tags.

Data response from LRP830

MSB LSB Remarks

AAH 8DH Command Echo/Tag 1

00H 30H Data byte 1/Tag 1

00H 31H Data byte 2/Tag 1

00H 32H Data byte 3/Tag 1

00H 33H Data byte 4/Tag 1

FFH FFH Terminator/ Tag 1

AAH 8DH Command Echo/Tag 2

00H 40H Data byte 1/Tag 2

00H 41H Data byte 2/Tag 2

00H 42H Data byte 3/Tag 2

00H 43H Data byte 4/Tag 2

FFH FFH Terminator/ Tag 2

AAH 8DH Command Echo/Tag 3

00H 34H Data byte 1/Tag 3

00H 35H Data byte 2/Tag 3

00H 36H Data byte 3/Tag 3

00H 37H Data byte 4/Tag 3

FFH FFH Terminator/ Tag 3

79

ABxS Command 8E (8EH): Memory Lock All

DESCRIPTION This command “locks” tag addresses in four byte blocks. Once bytes are locked, they can not be unlocked.

DISCUSSION The memory can be locked only in 4-byte blocks. The command passes a two byte word with bits assigned to 4-byte blocks that can be locked. Re

-

maining bits can lock the EAS feature and the lock configuration itself.

When multiple tag-in-field is enabled (Anticollision Index is not 0), the LRP830 will return a response when the timeout period expires. When mul tiple tag-in-field is disabled, the LRP830 will return a response when it locks bytes or the timeout expires.

Attempting to write to locked bytes will return a write error timeout in the status byte. If you write to addresses that\ contain both locked and non-locked bytes, the LRP830 will return a write error in the status byte.

The configuration word formatted as shown below.

-

Byte

Lock LSB

Lock MSB

Bit

0 Tag bytes 0-3

1 Tag bytes 4-7

2 Tag bytes 8-11

3 Tag bytes 12-15

4 Tag bytes 16-19

5 Tag bytes 20-23

6 Tag bytes 24-27

7 Tag bytes 28-31

8 Tag bytes 32-35

9 Tag bytes 36-39

10 Tag bytes 40-43

11 Tag bytes 44-47

12 Lock Configuration

13 Lock EAS feature

14 Reserved

15 Reserved

Description

80 LRP830-Series Long-Range Passive Reader/Writer

If a bit in the configuration word is set, then the corresponding block in the tag is locked when the command is issued. If a bit in the configuration word is cleared (0), then the corresponding block will not change. Once locked, a block can not be unlocked.

The command is formatted as shown below.

Field Remarks

Command Command number in hex preceded by AAH

Family Code Tag Family ID - 00H = all tags

Anticollision index Number of tags-in-field expected

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Lock MSB Bits 8-15 of the configuration word

Lock LSB Bits 0-7 of the configuration word

Message Terminator FFFFH

EXAMPLE This example will lock bytes 0-3 on all tags-in-field with the Family ID of 02H. Two tags are found and locked.

Command from Host

MSB LSB Remarks

AAH 8EH Perform Command 8E

02H 01H Family ID/anticollision Index

07H D0H 2 second timeout

00H 01H Lock Configuration

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 8EH Command Echo

02H 08H Ntag/Status

FFH FFH Message Terminator

81

ABxS Command 94 (94H): SN Fill

DESCRIPTION Fills only the RFID tag specified by serial number with a one byte value over multiple contiguous addresses.

DISCUSSION This command is commonly used to clear an RFID tag's memory. It writes a one byte value repetitively across a specified range of tag addresses. Only the tag with the specified serial number will be affected by this command. The LRP830 will return a response after the successful fill operation or when the timeout expires.

The fill function requires a Family ID and an Anticollision Index, one data value byte, a starting address, and a fill length. Then the command lists the serial numbers of the tag to be filled. It fills the specified tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. When Fill Length is set to 0, the LRP830 will write fill data from the start address to the end of the tags memory.

The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error. It returns a response when done or when the timeout expires.

Field Remarks

Command Command number in hex preceded by AAH

Family Code Tag Family ID - 00H = all tags

Anticollision index Number of tags-in-field expected

Start Address The tag address where the fill will start

Fill Length The number of tag addresses to be filled

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Tag Serial Number The 8-byte serial number

Data Value Byte The byte used to fill

Message Terminator FFFFH

82 LRP830-Series Long-Range Passive Reader/Writer

A response to a successful command will follow this form.

Field Remarks

Command Echo Command number in hex preceded by AAH

Number of Tags filled 0 = tag not found, 1 = tag filled

Command Status One byte Error status

Message Terminator FFFFH

EXAMPLE Writes 'A' (41H) to a single tag, starting at tag address 0005H for the follow ing next consecutive 40 bytes. The Family ID is turned off and the Anticollision Index is set to expect 2-4 tags. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the configuration.

-

Command from Host

MSB LSB Remarks

AAH 94H Perform Command 94

00H 01H Family ID/ Index 1

00H 05H Start Address

00H 28H Fill Length

07H D0H Timeout

00H 01H SN byte 1

00H ACH SN byte 2

00H 42H SN byte 3

00H D0H SN byte 4

00H 27H SN byte 5

00H 1CH SN byte 6

00H 65H SN byte 7

00H 33H SN byte 8

00H 41H Fill byte

FFH FFH Message Terminator

Response from Host

MSB LSB Remarks

AAH 94H Command Echo

01H 00H Ntag/Status

FFH FFH Message Terminator

83

ABxS Command 95 (95H): SN Block Read

DESCRIPTION Read a block of data from a specified RFID tag.

DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command if there is no tag Family ID. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error.

The SN Block Read consists of Family ID and an Anticollision Index, a start address and length, followed by a timeout value. The 8-byte serial number of the target tag is specified. If the read length exceeds the last tag address, the LRP830 will return error message in the status byte. It returns a response when done or when the timeout expires.

The data read from the tag is returned in the LSB of the register, and the MSB is always 00H. A special error packet (AAH FFH) is sent if the timeout expires.

Field Remarks

Command Command number in hex preceded by AAH

Tag Family Tag Family ID - 00H = all tags

Anticollision index Number of tags expected

Start Address The tag address where the read will start

Read Length The numbers of tag addresses to be read

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Tag Serial Number 8-byte tag serial number

Message Terminator FFFFH

84 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE: Reads 4 bytes of data from the tag specified by serial number starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec incre

ments) is set for the completion of the SN Block Read. The Family ID byte is set to zero. The Anticollision Index is set to 2, expecting 4-8 tags in the field.

Command from Host

MSB LSB Remarks

AAH 95H Perform Command 95

00H 02H Tag Family 00/ Index 2

00H 01H Start Address

00H 04H Read Length

07H D0H Timeout

00H ABH SN byte 1

00H 02H SN byte 2

00H F3H SN byte 3

00H 55H SN byte 4

00H C5H SN byte 5

00H 2DH SN byte 6

00H 41H SN byte 7

00H A0H SN byte 8

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 95H Command Echo

00H 30H Data byte 1

00H 31H Data byte 2

00H 32H Data byte 3

00H 33H Data byte 4

01H 00H Ntag/Status

FFH FFH Message Terminator

85

ABxS Command 96 (96H): SN Block Write

DESCRIPTION Write a block of data to a single RFID tag specified by its serial number.

DISCUSSION This command is used to write segments of data to contiguous areas of tag memory. It is capable of transferring up to 48 bytes of data transferred from the Host with one command. The timeout value is given in 1 msec incre

ments and can have a value of 1EH to FFFEH (65,534 ms). When the time out is set to 0, the LRP830 will return a syntax error.

The SN Block Write consists of a Family ID, Anticollision Index, and start address followed by the data stream to be written to the RFID tag. If the write range exceeds the last tag address, the LRP830 will return an error message 21H, invalid format. It returns a response when done or when the timeout expires.

The data to be written to the tag is contained in the LSB of the register, and the MSB is always 00H.

Field Remarks

Command Command number in hex preceded by AAH

Family ID Tag Family ID - 00H = all tags

Anticollision Index Number of tags-in-field expected

Start Address The tag address where the write will start

Write Length The number of tag addresses to be written to

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Tag Serial Number 8-byte tag serial number

Write Data The data to be written (1-48 bytes)

Message Terminator FFFFH

-

86 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE: Writes 4 bytes of data, starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the Block Write. The Family ID byte is set to 0 and the Anticollision Index is set to 2 for this example.

Command from Host

MSB LSB Remarks

AAH 96H Perform Command 96

02H 02H Tag Family 02/ Index 2

00H 01H Start Address

00H 04H Write Length

07H D0H Timeout

00H A4H SN byte 1

00H 6CH SN byte 2

00H 18H SN byte 3

00H 92H SN byte 4

00H 2DH SN byte 5

00H 34H SN byte 6

00H DEH SN byte 7

00H 20H SN byte 8

00H 40H Data byte 1

00H 41H Data byte 2

00H 42H Data byte 3

00H 43H Data byte 4

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 96H Command Echo

01H 00H Ntags/Status

FFH FFH Message Terminator

87

ABxS Command 97 (97H): SN Block Read All

DESCRIPTION Read a block of data from all RFID tags-in-field or those with the specified Family ID. Return the serial number of the tags read, along with tag data.

DISCUSSION This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 48 bytes of data transferred to the host with one command if there is no tag family ID. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the LRP830 will return a syntax error.

The response to this command will contain the serial number of the respond ing tags preceding the data from those tags. The termination packet is trans mitted when the timeout expires. Each packet will be sent to the host as soon as it is available. The returned serial numbers can be used to read/write to tags-in-field via the SN Block Read/Write command.

The SN Block Read All consists of Family ID, Anticollision Index, a start address and length, followed by a timeout value and the message terminator FFFFH. A special termination packet is sent when the timeout expires. If the Anticollision Index is 0, a response is returned when the operation is successfully completed on 1 tag, or when the timeout expires. A termination packet is not sent for successful completion if the Anticollision Index is 0.

If the read length exceeds the last tag address, the LRP830 will return an invalid format error message (error code 21H).

Field Remarks

Command Command number in hex preceded by AAH

Tag Family Tag Family ID - 00H = all tags

Anticollision index Number of tags expected

Start Address The tag address where the read will start

Read Length The number of tag addresses to be read

Timeout 2-byte timeout value in 1 ms increments (1EH - FFFEH)

Message Terminator FFFFH

-

NOTE:

This command can not be used over a DeviceNet interface.

88 LRP830-Series Long-Range Passive Reader/Writer

EXAMPLE: Reads 2 bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the completion of the SN Block Read All. The Family ID byte is set to zero so all tags will be read. The Anticollision Index is set to 2 so 4-8 tags are expected. Two tags respond with read data.

Command from Host

MSB LSB Remarks

AAH 97H Perform Command 97

00H 02H Tag Family 00/ Index 2

00H 01H Start Address

00H 02H Read Length

07H D0H Timeout

FFH FFH Message Terminator

Response from LRP830

MSB LSB Remarks

AAH 97H Command Echo/Tag 1

00H 10H SN byte 1/Tag 1

00H 43H SN byte 2/Tag 1

00H 6CH SN byte 3/Tag 1

00H 73H SN byte 4/Tag 1

00H 92H SN byte 5/Tag 1

00H C0H SN byte 6/Tag 1

00H D6H SN byte 7/Tag 1

00H 54H SN byte 8/Tag 1

00H 30H Data byte 1/Tag 1

00H 31H Data byte 2/Tag 1

FFH FFH Terminator/ Tag 1

AAH 97H Command Echo/Tag 2

00H 08H SN byte 1/Tag 2

00H 0AH SN byte 2/Tag 2

00H 81H SN byte 3/Tag 2

00H 18H SN byte 4/Tag 2

00H 23H SN byte 5/Tag 2

00H CCH SN byte 6/Tag 2

00H D0H SN byte 7/Tag 2

00H EFH SN byte 8/Tag 2

00H 40H Data byte 1/Tag 2

00H 41H Data byte 2/Tag 2

FFH FFH Terminator/ Tag 2

AAH FFH Command Echo/end

02H 08H Ntags/Status

FFH FFH Message Terminator

89

6.5 ABx Fast Protocol

6.4 ABx Fast Protocol

The difference from the standard ABx are:

The command/response packet contains the packet size

n

You can include a checksum in the command

n

The headers and terminator are ASCII characters

n

Since ABx Fast is a binary protocol, the Xon/Xoff handshake

n

cannot be used.

ABx Command Packet Structure:

The command protocol is based on the following minimal packet structure. The data field and the checksum may not be present depending on the com mand type and your checksum setting.

Field Number of Bytes Content

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

Command Size 2 Packet length in bytes excluding the header, command

Command 1 Command Code

(Data) variable command data/parameters

(Checksum) 1 Optional Checksum

Terminator 1 <ETX> (03H)

size, checksum and terminator bytes.

-

Following a successful operation, the LRP830 will respond with the follow ing. The data field and the checksum may not be present depending on your checksum setting.

Field Number of Bytes Content

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

Response Size 2 Packet length in bytes excluding the header, response

size, checksum and terminator bytes.

Command 1 Command Echo

(Data) variable response data

(Checksum) 1 Optional Checksum

Terminator 1 <ETX> (03H)

90 LRP830-Series Long-Range Passive Reader/Writer

-

If the LRP830 Reader/Writer encounters a fault it will respond with the fol lowing:

Field Number of Bytes Content

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

Response Size 2 Packet length in bytes excluding the header, packet

Error Flag 1 FFH

Error Code 1 Hex error code, see Table 7 for details

(Checksum) 1 Optional Checksum

Terminator 1 <ETX> (03H)

The Header and Terminator are always STX-STX and ETX

n

size, checksum and terminator bytes. (02H in this case)

respectively.

All other bytes are interpreted as binary data (0 - 255 dec).

n

Fields with two bytes are sent most significant byte (MSB)

n

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 com

mand/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.

91

Checksum

Since the DeviceNet protocol has its own data validation, it is not necessary to use the checksum option when sending ABxF commands over the DeviceNet bus.

The optional checksum must be enabled from the operating mode menu to be available. The checksum is calculated by adding all the byte values in the packet (less the values in the header, checksum if present, and terminator), discarding byte overflow and subtracting the byte sum from FFH. Thus, when the packet length through the checksum are added as byte values, the sum will be FFH.

EXAMPLE The following is a typical command using a checksum.

Command from Host

Field Contents

Header <STX><STX>

Command Size 00H

Command Code 01H

Timeout 07H

Checksum 24H

Terminators <ETX> 03H

02H

03H

D0H

Sum these values to calculate the 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

The optional Checksum is included in the following command explanations.

92 LRP830-Series Long-Range Passive Reader/Writer

Balluff LRP800 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual