User's Manual

Page 13
TRANSMIT
Use
Transmits data from the coupler to the chip and read back chip response.
This command is the one to use to read and write data in the chip.
Prototyping
• Command sent : C2h
• Command type : ISO In / Out
Host 80h C2h P1 P2 P3 Data
Coupler C2h Chip answer 90h 00h
P1 : Defines the contactless communication protocol
P2 : Chip answer length
P3 : Chip command and data
Parameters
P1: Parameter used for contactless configuration
Bit 7 6 5 4 3 2 1 0
Function Send
CRC
Check
CRC
Time out Send signature ISO type RF protocol type
b7: Send CRC
1: The coupler automatically sends the CRC (function of the Data bytes) to the chip. Coupler uses the CRC
associated to the choosen protocol (bit 1 & 0)
0: Only P3 data bytes are sent.
b6: Compare CRC
1: Compares the returned CRC with the expected value calculated by the coupler (verify the data sent by
the chip).
0: CRC is not checked.
b5-b4: Time Out
The time out value depends of the protocol used (b1 and b0 values).
The time out is the time from the command’s EOF (End Of Frame) to the chip response SOF (Start of
Frame).
Couplers - Reference Manuel V1.3