User's Manual

Page 8
SELECT CARD
Use
Select a card in order to get the serial number. This command manages anti-collision and authentication
features.
This command is able to test several communication protocol. It answers the number of protocol used to select
the card.
Prototyping
• Command sent : A4h
• Command type : ISO out
Host 80h A4h P1 P2 P3
Coupler A4h Serial Number 90h 00h
Parameters
Bit 7 6 5 4 3 2 1 0
Function - - Key Auth Presel. Loop Halt Wait
P1: Parameter used for contactless configuration
Important note: ‘ – ‘ are reserved for future use, and values should be set to 0.
WAIT :
1: Wait until a card is selected or a character received from the host (e.g. PC).
0: Exit if no card is detected after 3 attempts.
Note: When SELECT_CARD uses the option «LOOP», the coupler sends ACK=60h
(See T=0 specifications) after each unsuccessful selection until a card is selected.
When a card is selected, «90h 00h» is returned. In order to stop this scanning,
host has to send a byte through the RS232 interface.
HALT:
1: Halts card after selection for fast serial numbers capture.
0: No halt after selection.
LOOP:
1: returned a frame composed of ACK | CARD TYPE | SN | 9000h or wait character 60h
0: no loop performed.
Couplers - Reference Manuel V1.3