Overview
The Phoenix Contact PSM-ME-RS232/RS485-P (Order No. 2744416) is a compact serial interface converter that converts RS-232 interface signals bidirectionally to RS-485 2/4-wire and RS-422 standards with electrical isolation. Designed for integration into DIN rail enclosures, this 2-channel converter enables seamless communication between legacy RS-232 serial devices and modern industrial RS-485/RS-422 multi-drop networks. It is particularly useful in retrofit automation projects where you need to bridge incompatible serial protocols without costly system redesign.
Key Features
- Dual-mode operation: RS-422 4-wire point-to-point, RS-485 2-wire half-duplex, and RS-485 4-wire full-duplex
- Galvanic isolation: Eliminates ground loop noise and protects connected devices from voltage spikes
- Automatic transmit/receive switching: Streamlines half-duplex RS-485 operation
- Wide speed range: Supports 1.2 kbps to 115.2 kbps transmission rates
- Flexible connectivity: DB9 male RS-232 connector and COMBICON screw terminal blocks for RS-485/RS-422
- DIN rail mounting: Standard EN 35 × 7.5 rail snap-on design for rapid cabinet integration
- Built-in data indicator: LED for dynamic transmission monitoring
Technical Specifications
- Model: PSM-ME-RS232/RS485-P
- Manufacturer Part No.: 2744416
- Channels: 2
- Input Voltage: 24 VAC/DC ±20%
- Power Consumption: ~85 mA
- Dimensions (W × H × D): 22.5 × 99 × 114.5 mm
- Operating Temperature: 0 to +55 °C (extended range: −40 to +70 °C per datasheet)
- Degree of Protection: IP20
- Housing Material: PA 6.6-FR (flame-retardant polyamide)
- Housing Color: Green (RAL 6021)
- Interface A (Serial): RS-232 (V.24), DB9 male connector
- Interface B (Bus): RS-485 (IEC 61076-2-109), COMBICON terminal block
- Data Format: UART/NRZ, character length 10–11 bits
- Transmission Speed: 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6, 115.2 kbps
- Galvanic Isolation: Yes, electrical isolation between RS-232 and RS-485 sides
- Protocol Support: Transparent protocol mode
Typical Applications
The PSM-ME-RS232/RS485-P is ideal for industrial retrofit and integration projects including:
- Bridging legacy RS-232 serial sensors and meters to modern RS-485 fieldbus networks
- Multi-device data collection in harsh factory environments (automotive, food processing, chemicals)
- Upgrading older SCADA systems to support distributed I/O on RS-485 networks
- Integration with Modbus RTU, Profibus, HART, and other UART-based industrial protocols
- Temperature and pressure transmitter networks requiring galvanic isolation and noise immunity
- Point-to-point or multi-drop serial communication in cabinet-based control systems
Compatibility & Replacements
Compatible With
- Phoenix Contact terminal block systems (ST series, COMBICON blocks)
- DIN rail enclosures (standard EN 35 × 7.5 rail)
- Devices supporting RS-232, RS-422, and RS-485 serial protocols
- PLC controllers with serial ports (Allen-Bradley, Siemens, Mitsubishi, Omron)
- Industrial sensors and transmitters using UART/NRZ data format
- Modbus RTU, HART, Profibus, and other transparent-protocol serial networks
- 24 VDC and 24 VAC power supplies in control cabinets
Replaces / Drop-In Replacement For
- Phoenix Contact PSM-EG-RS232/RS485-P (single-channel variant)
- Verify compatibility with your system integrator before ordering to confirm the exact model and configuration match your application.
Works With
- RS-232, RS-422, RS-485 serial communication protocols
- Modbus RTU fieldbus systems
- HART communication networks
- Profibus and other UART-compatible industrial buses
- Phoenix Contact industrial control and monitoring software platforms
- Standard industrial PLC and SCADA environments
