User Guide

Table Of Contents
Allegro/Title-21 Tag Commands
67
Title-21 ACK Request Fields
Examples
An example command requesting an ACK from tag XXX from reader XXX is:
ACK Response
NACK Response
Field Value Description
TM OpCode 0x24 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 0xC000 Allegro/Title-21 code indicating operation to per-
form.
Tag ID [4 bytes] Indicates the ID of the tag to operate on.
Reader ID [4 bytes] The reader number for the reader that is acknowl-
edging the receipt of the message.
Transaction Status Code [2 bytes] Code indicating the status of the transaction.
FF 0D 24 ?? ?? 00 C0 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??
SOH Length OpCode Time-
out (ms)
TM
Option
Transac-
tion Type
Code
Tag ID Reader ID Transac-
tion Status
Code
CRC
FF 03 24 ?? ?? 00 C0 00 ?? ??
SOH Length TM
OpCode
Status TM
Option
Transaction
Type Code
CRC
FF 0B 24 ?? ?? 00 C0 00 ?? ?? ?? ?? ?? ?? ??
SOH Length TM
OpCode
Status TM
Option
Transaction
Type Code
Options Tag ID CRC