Opengear OM1304-4E 4-Port RS232 Serial Module with 4-Port Gigabit Ethernet Switch, Software Selectable X1/X2 Pinout

Equipped with four software-selectable RS232 serial ports and a managed four-port Gigabit Ethernet switch, the Opengear OM1304-4E delivers industrial-grade connectivity in a compact embedded module. Its 200-pin SODIMM form factor and wide -40°C to +85°C operating range make it ideal for demanding automation, transportation, and remote infrastructure applications.

Overview

The OM1304-4E integrates serial device server and Ethernet switching functions into a single module. Each of the four RS232 ports supports baud rates up to 921.6 kbps with hardware and software flow control, while the built-in Layer 2 managed switch provides VLAN, QoS, and spanning tree protocol support. The module is powered by a 3.3V DC supply and is fully compliant with RoHS, CE, and FCC standards.

What stands out

• Four RS232 ports with software-selectable X1 or X2 pinout for flexible cabling
• Integrated 4-port Gigabit Ethernet switch with advanced Layer 2 features
• Wide operating temperature range from -40°C to +85°C for harsh environments
• Compact 200-pin SODIMM connector for easy integration into embedded systems
• Comprehensive management via Web GUI, SNMP, or CLI

Technical details

• Serial ports: 4x RS232, software selectable X1/X2 pinout
• Serial baud rate: up to 921.6 kbps
• Serial flow control: hardware (RTS/CTS) and software (XON/XOFF)
• Ethernet ports: 4x 10/100/1000Base-T (Gigabit)
• Ethernet switching: Layer 2 managed, IEEE 802.3, 802.3u, 802.3ab, 802.1Q VLAN, 802.1p QoS, 802.1D/w STP/RSTP
• Management: Web GUI, SNMP, CLI
• Host interface: 200-pin SODIMM connector
• Power input: 3.3V DC
• Operating temperature: -40°C to +85°C
• Operating humidity: 5% to 95% RH non-condensing
• Compliance: RoHS, CE, FCC
• OS support: Linux (drivers available)

Our verdict

A rugged, feature-rich serial-to-Ethernet module that combines reliability with flexible configuration, making it a solid choice for industrial IoT and remote management deployments.