Phoenix Contact PSM-ME-RS232/RS485-P interfaceconverter 2744416

Connecting legacy RS-232 equipment to modern RS-485 networks often requires manual data direction control and risks electrical interference. The Phoenix Contact PSM-ME-RS232/RS485-P solves this by converting signals between RS-232 and RS-485 with automatic data direction detection and 2 kV electrical isolation.

Who is it for

Industrial automation engineers, system integrators, and maintenance technicians who need to extend communication distances or integrate multiple devices on a robust differential bus. This converter suits DIN rail installations in control cabinets.

Main features

• Converts RS-232 to RS-485 and vice versa, enabling long-distance communication up to 1200 m.
• Automatic data direction detection eliminates the need for handshake signals or software control.
• Electrical isolation of 2 kV between RS-232 and RS-485, and between supply and RS-485, protects against ground loops and surges.
• Switchable termination resistor for RS-485 bus matching.
• DIN rail mountable (NS 35) for easy integration into industrial enclosures.
• Wide operating temperature range from -25 °C to 70 °C.

Specifications

• Data transmission rate: up to 115.2 kbps
• Supply voltage: 24 V DC (19.2 V DC to 30 V DC)
• Current consumption: max. 50 mA
• RS-232 connection: D-SUB 9-pin male
• RS-485/supply connection: pluggable screw terminal
• Housing material: polyamide (PA)
• Protection rating: IP20
• Number of channels: 1

Tips

Ensure the RS-485 bus is correctly terminated at both ends using the built-in switchable resistor. For best performance, use twisted-pair cable and keep the RS-485 segment length within 1200 m at lower baud rates.