... coupling utensil relay isolatedConvenient to Use RS485 communication output: only two signal wires needed can build a multi-dot ... distributed network; based on standard MODBUS-RTU protocol, can easily communicate with modern DCS, HMI, PLC etc Intelligent ... -GNDRS-232 connectionTX-TX, RX-RX,GND-GNDRS-485 connection485A-485A, 485B-485B KH702U RS485/RS232 to USB Communication Converter