The Phoenix Contact PSM-ME-RS232/RS232-P (Order Number 2744461) is a high-performance, 4-channel industrial interface converter designed for the high-quality electrical isolation and surge protection of RS-232 (V.24) serial interfaces. By implementing galvanic isolation between devices, it prevents ground loops, transient voltage spikes, and industrial noise from damaging sensitive control equipment like PLCs or PCs.

• Channels & Signal Support: 4 full-duplex channels (transmits TxD/RxD data lines alongside RTS/CTS hardware handshake control lines). 
• Electrical Isolation: High-quality 3-way isolation up to 2 kV AC (separating VCC // V.24 (RS-232) // TTY / ground layers). 
• Transmission Speed: Supports data rates up to 115.2 kbps. 
• Protocol Compatibility: Transparent to protocol; fully compatible with standard serial data streams and industrial protocols like Modbus RTU/ASCII. 
• Power Supply: 24 V AC/DC nominal voltage (operational range of 19.2 V to 28.8 V AC/DC) with low power consumption (~0.96 W max dissipation). 
• Physical Connections: Standard D-SUB 9-pin male connector on one side and pluggable screw terminal blocks for field-side wiring. 
• Physical Form Factor: Housed in a green PA (polyamide) enclosure designed for standard EN DIN rail mounting. Dimensions are 22.5 mm × 99 mm × 118.6 mm. 

• LED Indicators: Features separate built-in diagnostic LEDs to indicate active data transmission (toggling state on TxD/RxD lines) and power supply status.
• Surge Mitigation: Integrated transient surge protection elements discharge harmful spikes directly into the grounded DIN rail system.