User Guide

Table Of Contents
Allegro/Title-21 Tag Commands
72
ACK Response
NACK Response
No Response
Random Number Request (28h; D001h)
The Random Number Request command requests a 32-bit random number from the
specified tag which is used in the P/W authentication scheme. This command also
specifies which page is to be read or written to with the encrypted P/W on the next cycle.
This command contains the following request fields:
FF ?? + N 28 00 00 00 C0 03 ?? ?? ?? ?? ?? ?? ?? ?? .. .. ?? NN NN ?? ??
SOH Length TM
OpCode
Status TM
Option
Transac-
tion Type
Code
Options Tag ID Page
Number
AntiPlay-
Back
(0, 1, 2)
[Based
on
Options]
Page
Count
Page Data CRC
FF 0B 28 04 0A 00 C0 03 ?? ?? ?? ?? ?? ?? ??
SOH Length TM
OpCode
Status TM
Option
Transaction
Type Code
Options Tag ID CRC
FF 00 28 04 00 25 AA
SOH Length TM
OpCode
Status CRC