RS-232 Relay

RS-232 Relay at a Glance...

  • 2 Relay Installed on a Circuit Board
      - Non-Expandable ProXR Lite Design
  • RS232 Interface with Choice of Connector
      - Onboard DB-9 connector
      - Screw terminal serial connection
      - Off-board DB-9 cable option
      - Connects to any standard COM port
  • Industry Leading ProXR Command Set
      - Program in almost any language
      - Send precise commands to control relays
      - Control individual, grouped, or all relays
      - Toggle, flash, and timing commands
  • ProXR AD8 Command Set
      - Read 0-5V sensor inputs
      - Monitor external sensors or contact closures
      - Relay Activator: inputs can directly control relays

Selecting the Proper Amperage

For more information on selecting a board with the correct relay amperage for your application see Choosing a Proper Amperage.

Need a 2-channel RS-232 relay for independent device control? These ProXR Lite boards let you switch two relays using an RS-232 Connection through any available COM port.

RS-232 Relay Controller Boards

RS-232 Relay Controllers allow you to control relays using a standard DB-9 serial connection. These boards use onboard firmware to control individual relays, relay banks, or all relays at once using simple serial commands with automatic status refreshing.

RS-232 Relays connect directly to computers and third-party control systems through any available COM port at standard baud rates, making them easy to integrate into automation software, data collection systems, and industrial control environments.

These controllers are ideal for applications that require reliable, wired communication with a single control device.

2-Channel RS-232 Relay Series (ProXR Lite)

2-Channel RS-232 Relay Boards are available in the non-expandable ProXR Lite version. While ProXR Lite boards cannot be expanded, they still support the full ProXR Command Set - the industry's most powerful relay control protocol.

- Program in nearly any language.
- Send precise relay commands.
- Control with confidence.

Select Your Relay Type & Amperage

Choose the 2-channel RS-232 relay controller that matches your load requirements:
  • SPDT Relays: 5A, 10A, or 20A
  • SPST Relays: 30A
Need help selecting the right relay amperage?
Use our Choosing a Proper Amperage to make the right call for your application.

💡 Relay Pros Pro Tip:

If you're controlling high-current loads like motors or heaters, always choose a relay with extra amperage headroom. Running a relay at its maximum rating can shorten its lifespan.