Feature:1. SETTABLE RELATIONSHIP: 12 optically isolated input ports(NPN active low), the input and output relationship can be set to associated(default) and not associated through commands2. 64 DEVICES IN PARALLEL: In command mode, up to 64 devices can be connected in parallel with this RS485 relay switch module3. NO, EVEN AND ODD CHECK: The check method can be no check, even check and odd check, flexible and versatile, more practical4. 7 INSTRUCTIONS IN TOTAL: There are 7 instructions of on, off, instantaneous, self locking, interlocking, delay and 2 channel interlocking5. DURABLE PCB: Good quality PCB materials have reliability and miniaturization, good maintenance and interchangeabilitySpecification:Item Type: RS485 Relay Switch ModuleModel: ETD8A12Material: PCBProduct Features: RTU Command: Support 03 06 16 function code"Delay" Command: 255 seconds maximum delayThe command can be entered through the serial port hyper terminal (serial port assistant) or "Poll"Default Baud Rate: 9600BPSBaud Rate Can Be Selected By Jumper: 2400 4800 9600 19200 38400 57600 115200BPSThe Data Sending And Returning Time: Can be set, 1000ms maximum value.Package List:1 x RS485 Relay Switch ModuleNote:Pay attention to standard operation wiring.