16 channels photoelectric isolation Input ports (NPN low level active) 16 channels output (ULN2803 NPN output) open "close" "Momentary" "Self-locking" "Interlock" "Delay" 6 Commands 16 inputs can remotely control 16 outputs of another board via RS485 bus (relevant registers must be set) MODBUS RTU , Support 03 06 function code(Some registers support 16 function codes) Under the "Delay" ,the maximum delay is 255 seconds; MODBUS commands can be made serial HyperTerminal (serial assistant) OR "Modbus Poll" Enter; Under the MODBUS mode, it can support up to 64 devices in parallel The default baud rate is 9600BPS. The baud rate can be through : 2400 4800 9600 19200BPS Maximum load: the maximum load current of each channel is 300MA Style: Only Board Material:plastic colour:Blue Package Contents: 4 x Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.