Chinese Cheap RS485 Modbus Io Module Stc-112 with 8 Analog Input, 2 Analog Output, 8 Digital Input, 4 Relay Output, Find details about China Modbus RTU, Remote Io from Chinese Cheap RS485 Modbus Io Module Stc-112 with 8 Analog Input, 2 Analog Output, 8 Digital Input, 4 Relay Output