Conrad Electronic 197720 Notice D'emploi page 32

 Broadcasting
A command frame with the address value 0 is regarded as a broadcast and executed by each
relay board (exception see below). After execution, the board controller initially sends the
corresponding response. Afterwards it generates the broadcast command for the following
board.
 Commands
For each executed command, the relay board controller sends an answer frame:
inverted command ID - own address - data - new checksum
The following commands are defined (x stands for "no significance" each time):
CMD Meaning
0 NO OPERATION
no action (NOP)
1 SETUP
Initialization
2 GET PORT
Query switching statuses
3 SET PORT
Switch relay
4 GET OPTION
Query options
5 SET OPTION
Set options
6 SET SINGLE
Switch on relay without changing the other outputs
7 DEL SINGLE
Switch off relay without changing the other outputs
8 TOGGLE
Changing the switching status without changing the remaining outputs
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Command frame
0 - Adr. - x - XOR
1 - Adr. - x - XOR
2 - Adr. - x - XOR
3 - Adr. - Data - XOR
4 - Adr. - x - XOR
5 - Adr. - Opt. - XOR
6 - Adr. - Data - XOR
7 - Adr. - Data - XOR
8 - Adr. - Data - XOR
Response
255 - Adr. - x - XOR
254 - Adr. - Info - XOR
253 - Adr. - Data - XOR
252 - Adr. - x - XOR
251 - Adr. - Opt. - XOR
250 - Adr. - x - XOR
249 - Adr. - Data - XOR
248 - Adr. - Data - XOR
247 - Adr. - Data - XOR