RFID Communications

In Continuous Read mode, the LEDs indicate the following:

LED

Behavior

Description

ANT

ON

Assumes the antenna is powered and functioning

 

 

 

CONFIG

BLINK

Tag entered the RF field

 

 

 

RF

ON

Tag has been read and is still in the field

 

 

 

RF

OFF

Read tag has been out of range for the specified time

 

 

 

The command and response from the controller are formatted as follows.

Command

 

 

Response

 

 

 

 

 

 

 

Field

Remarks

 

MSB

LSB

Remarks

Command

Command number in hex preceded by AAH

 

AAH

0DH

Command Echo

 

 

 

 

 

 

Start Address

2 byte value for the start address in the tag

 

FFH

FFH

Message Terminator

 

 

 

 

 

 

Read Length

2 byte value for the read length

 

 

 

 

 

 

 

 

 

 

Delay Between

Time the tag must be out of the antenna range before

 

 

 

 

Identical Decodes

the controller will transmit data again from that tag.

 

 

 

 

 

Value is expressed in 1 second units

 

 

 

 

 

 

 

 

 

 

Message Terminator

FFFFH

 

 

 

 

 

 

 

 

 

 

This example places the controller in Continuous Read mode and reads eight 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 Timeout

 

 

 

FFH

FFH

Message Terminator

 

 

 

Response from controller

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

 

 

 

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

65

LRP2000 Passive Reader/Writer

Page 70
Image 70
Escort LRP2000 manual Behavior Description, Ant, Config Blink, Command Response Field Remarks, AAH 0DH