The TRM-4 module has two Form C relay contact that can be programmed to activate when mapped devices detect active conditions. Those two Form C relay contacts shall activate simultaneously. The relay condition between C1 and NO1, and C2 and NO2 is Normally-open connection, and the condition between C1 and NC1, and C2 and NC2 is Normally-close connection. When the TRM-4 receives the command to operate the relay contact, TRM-4 will close the C1 to NO1 and C2 to NO2, and open the C1 from NC1 and C2 from NC2.
