Data Sheet

Coupler - Reference manual
RM 10
Version 1.2
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
7654 3 210
Function
Send
CRC
Check
CRC
Send
signature
ISO
type
RF protocol
type
Time out
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).
Bits 4& 5
Time-out
15 693
Time-out
14 443
00 800 µs 200 µs
01 4 ms 1 ms
10 24 ms 6 ms
11 40 ms 10 m