Link4

Product Overview - I/O Modbus Expansion Modules
DIN-rail I/O Modbus expansion modules with isolated RS485, fast installation, and reliable PLC, BMS & SCADA integration.
About Link4
Link4 Corporation an industrial Modbus RTU I/O manufacturer with 20+ years of automation experience. Our solutions feature isolated RS485 communication, compact DIN-rail design, and industrial-grade reliability for PLC, SCADA, BMS, and environmental control systems.

