User manual

 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 Command frame Response

0 NO OPERATION 0 - Adr. - x - XOR 255 - Adr. - x - XOR

no action (NOP)

1 SETUP 1 - Adr. - x - XOR 254 - Adr. - Info - XOR

Initialization

2 GET PORT 2 - Adr. - x - XOR 253 - Adr. - Data - XOR

Query switching statuses

3 SET PORT 3 - Adr. - Data - XOR 252 - Adr. - x - XOR

Switch relay

4 GET OPTION 4 - Adr. - x - XOR 251 - Adr. - Opt. - XOR

Query options

5 SET OPTION 5 - Adr. - Opt. - XOR 250 - Adr. - x - XOR

Set options

6 SET SINGLE 6 - Adr. - Data - XOR 249 - Adr. - Data - XOR

Switch on relay without changing the other outputs

7 DEL SINGLE 7 - Adr. - Data - XOR 248 - Adr. - Data - XOR

Switch off relay without changing the other outputs

8 TOGGLE 8 - Adr. - Data - XOR 247 - Adr. - Data - XOR

Changing the switching status without changing the remaining outputs