EXSYS EX-47900 RS-232 to RS-422/RS-485 Serial Protocol Converter

Connect legacy RS-232 equipment to modern RS-422 or RS-485 networks in industrial automation, building management, or laboratory environments. The EXSYS EX-47900 converts bidirectional RS-232 signals to RS-422 or RS-485, enabling long-distance communication up to 1.2 km and multi-drop configurations.

Key specifications

• Converter type: RS-232 to RS-422/RS-485
• RS-232 connector: DB9 male
• RS-422/RS-485 connectors: DB9 male and 5-pin terminal block
• Data modes: RS-422 4-wire full duplex, RS-485 2-wire half duplex, RS-485 4-wire full duplex
• Maximum baud rate: 115.2 Kbps
• Maximum transmission distance: 1.2 km (4000 ft)
• Power input: 9-12V DC external or from RS-232 DTR/RTS lines
• ESD protection: 15kV on RS-232 lines
• Surge protection: 600W on RS-422/RS-485 lines
• Operating temperature: -25°C to 70°C
• Housing material: metal
• Mounting: wall mount or DIN-rail mount (kit often optional)
• LED indicators: Power, TxD, RxD
• Automatic data direction control for RS-485 half duplex
• Selectable 120 Ohm termination resistors via DIP switches
• OS independent (hardware-based)

Why choose it

This converter provides reliable signal conversion with robust protection against electrostatic discharge and surges, ensuring stable operation in harsh industrial settings. Its automatic data direction control simplifies RS-485 half-duplex communication, and the selectable termination resistors allow easy network configuration.

Ideal use cases

• Extending RS-232 connections beyond the 15-meter limit
• Integrating RS-232 devices into multi-drop RS-485 networks
• Connecting PLCs, sensors, or meters to supervisory systems
• Industrial automation and process control

Good to know

The converter can be powered externally or draw power from the RS-232 handshake lines, reducing cabling in many installations. Its metal housing provides durability, and the compact design allows mounting on a wall or DIN rail.