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HF Multi ISO RFID Reader User Manual, Firmware V1.4 
 
1508-USM-00-0-04 
 
2.3.1.7 
High-speed select 
This command selects a card in the antenna field (according to the selection criteria) or prepares 
a multi-select command, switches to high baud rates and enables 256-byte frames. If execution is 
successful, the command returns the UID of the selected card and the used baud rate. The reader 
automatically detects the maximum frame size of the card. The reader also tries to communicate 
to the transponder with the specified baud rate. If no communication is possible, the reader will 
automatically decrease the speed to the next lower value. 
In synchronous mode the up and downlink speed are identical. 
In asynchronous mode the up and downlink speed can be different. 
This command can also force the reader to the communication speed and frame size of the tag to 
the specified values. This is only needed if the high-speed select is done manually with the 
transfer command. 
Command 
Command 
Data 
‘h’ 
Option byte (1 byte) 
 
synchronous mode 
00h … select a single card with 106kBaud 
02h … select a single card with 212kBaud 
04h … select a single card with 424kBaud 
08h … select a single card with 848kBaud 
 
10h … prepare next multi-select for 106kbaud 
12h … prepare next multi-select for 212kbaud 
14h … prepare next multi-select for 424kbaud 
18h … prepare next multi-select for 848kbaud 
 
20h … forces reader to 106kBaud 
22h … forces reader to 212kBaud 
24h … forces reader to 424kBaud 
28h … forces reader to 848kBaud 
 
tag size 
30h – 38h … force tag frame size 
 
asynchronous mode 
80h … select a single card with 106kBaud 
82h … select a single card with 212kBaud 
84h … select a single card with 424kBaud 
88h … select a single card with 848kBaud 
 
90h … prepare next multi-select for 106kbaud 
92h … prepare next multi-select for 212kbaud 
94h … prepare next multi-select for 424kbaud 
98h … prepare next multi-select for 848kbaud 
 
A0h … forces reader to 106kBaud from tag to reader 
A2h … forces reader to 212kBaud from tag to reader 
A4h … forces reader to 424kBaud from tag to reader 
A8h … forces reader to 848kBaud from tag to reader 
 
August 2010 
 
Page 45 of 144 
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