RFID Communications

6.4.15 ABxS Command 87H: Read Tag SN All

DESCRIPTION

Command 87H retrieves the eight-byte tag serial number from all tags, or those with the specified Family ID number.

DISCUSSION

Each ISO-15693 compliant tag has an unique serial number (over 280 trillion possibilities). This number cannot be changed and is not part of the available data bytes. The tag serial number is returned in the LSB only, with the MSB as 00H. The timeout value is given in 1 ms increments and can have a value of 001EH to FFFEH (65,534 ms). When the timeout is set to 0, the controller returns a syntax error. A special termination packet (starting with AAH FFH) is sent when the timeout expires. A response is returned after successful operation or after the timeout has expired.

Field

Remarks

Command

Command number in hex preceded by AAH

 

 

Family ID

Tag Family ID - 00H = all tags

 

 

Reserved

00H

 

 

Timeout

Timeout value given in 1 ms units (001EH - FFFEH)

 

 

Message Terminator

FFFFH

 

 

Example

This example reads the 8-byte serial number from Tag Family 2. In this example, the ID for the found tag is 1E6E3CD2000104E0H in hexadecimal. Multiple tags return a complete response packet for each tag.

Command from Host

MSB

LSB

Remarks

AAH

87H

Perform Command 87

 

 

 

01H

00H

Family ID/Reserved

 

 

 

07H

D0H

2-second Timeout

 

 

 

FFH

FFH

Message Terminator

 

 

 

Response from Controller

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

01H

Sixth SN byte

 

 

 

00H

04H

Seventh SN byte

 

 

 

00H

E0H

Eighth SN byte

 

 

 

FFH

FFH

Message Terminator

 

 

 

AAH

FFH

Termination Packet

 

 

 

FFH

FFH

Message Terminator

 

 

 

LRP2000 Passive Reader/Writer

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Escort LRP2000 manual ABxS Command 87H Read Tag SN All, 6EH, 3CH, D2H