User Guide

Table Of Contents
Allegro/Title-21 Tag Commands
71
Random Number Request Fields
Examples
An example command:
ACK Response
NACK Response
Field Value Description
TM OpCode 0x28 TM OpCode for tag modification operations
Timeout [2 bytes] Indicates how long the command should spend
attempting the operation, in milliseconds.
TM Options 0x00 Reserved for Future Use.
Transaction Type Code 0xD001 Allegro/Title-21 code indicating operation to per-
form.
Options [1 byte] Command specific options
Tag ID [4 bytes] Indicates the ID of the tag to operate on.
Page Number [2 bytes] Species which page is to be operated on in the next
transaction.
Next Command [2 bytes] Specifies which command the reader will be send-
ing ot the tag on the next transaction, by Transac-
tion Type Code. Only Read and Write Request
commands are supported.
FF 0C 28 ?? ?? 00 D0 01 ??
?
?
?
?
?
?
?
?
?? ?? ?? ?? ?? ??
SOH Length TM
OpCode
Timeout
(ms)
TM
Option
Transaction
Type Code
Option Tag ID Page
Number
Next Com-
mand
CRC
FF ?? + N 28 00 00 00 D0 01 ?? ?? ?? ?? ?? ?? ?? ??
SOH Length TM
OpCode
Status TM
Option
Transaction
Type Code
Random Number ATA
Page
Number
CRC
FF 0B 28 04 0A 00 D0 01 ?? ?? ?? ?? ?? ?? ??
SOH Length TM
OpCode
Status TM
Option
Transaction
Type Code
Options Tag ID CRC