MultiTech MMH-904-C 4-port Rs232 Multimux

Overview

The MultiTech MMH-904-C 4-port Rs232 Multimux is a compact, high performance serial communication hub designed to simplify wiring and expand connectivity in industrial and laboratory environments. It combines four independent RS232 channels into a single module, providing reliable data routing, isolation and signal integrity while saving space on your control panels.

Key Features

• Four fully isolated RS232 ports with independent transmit and receive lines
• Automatic multiplexing allows seamless switching between devices without manual reconfiguration
• Built-in LED indicators for power, transmit and receive status on each channel
• Compact DIN rail mountable housing for easy installation
• Low power consumption and robust metal enclosure for harsh environments

Technical Specifications

• Connector type: DB9 male for each port
• Baud rate support: 300 to 115200 bps
• Data format: 5 to 8 data bits, parity (none, even, odd), 1 or 2 stop bits
• Isolation voltage: 2500 V rms between ports and chassis
• Operating temperature: -20 to 70 degrees C
• Supply voltage: 12 to 24 V dc
• Current draw: max 150 mA
• Dimensions: 120 mm x 80 mm x 30 mm (L x W x H)

Typical Applications

• Industrial automation systems that require multiple serial devices such as PLCs, barcode scanners and motor controllers
• Test and measurement equipment where several instruments must be monitored from a single PC
• Embedded systems development kits that need isolated serial ports for debugging and data logging
• Medical device integration where signal isolation and reliability are critical
• Security and access control panels that connect to multiple readers or controllers

By consolidating four RS232 links into one rugged module, the MultiTech MMH-904-C reduces cabling complexity, improves system reliability and offers flexible expansion for any serial communication challenge.