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5.4
General reading instructions
5.4.1
GA – get active
The command GA causes one reading cycle. There are different cycles for different transpondertypes.
This command is only available in the ISO 14443A standard.
Mifare standard 1K/4K:
request (REQA)
anticollision
select
Mifare Ultralight/Desfire
request (REQA)
anticollision level 1
select 1
anticollision level 2
select 2
The reader answers the UID of an active (non halt) transponder. The length of the UID can be be-
tween 4 and 7 bytes.
Input format:
GA
<CR>
Output (example):
625E562A
<CR>
5.4.2
GT – get tag
With the command GT you select a transponder. The command GT causes one reading cycle. There
are different cycles for different transpondertypes.
Mifare standard 1K/4K:
request (WUPA)
anticollision
select
Mifare Ultralight/Desfire:
request (WUPA)
anticollision level 1
select 1
