Serial Controlled Relay

Serial Controlled Relay at a Glance...

  • 16 Relays Installed on a Circuit Board
      - Expandable to 256 Relays with expansion boards
  • 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

Reliable Serial Connection

If your system can send serial commands through a DB-9 port or direct 3-wire connection, it can control these relays - no drivers, no network setup, no subscription fees.

This 16-channel RS-232 relay board gives you 16 individually controlled relays and the ability to expand up to 256 relays, making it ideal for scalable automation, industrial control, and custom relay projects.

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. Serial Controlled Relay

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.

Selecting a RS-232 Relay Board Series

The 16-Channel RS-232 Relay Boards are built on the ProXR platform, featuring the industry-leading ProXR Command Set for advanced relay control.

Every ProXR controller is expandable up to 256 relays, making it easy to start with 16 relays today and grow your system as your project evolves.

Expansion boards can be added at checkout or anytime in the future.
Serial Controlled Relay

Select Your Relay Type & Amperage

Choose the 16-channel RS-232 relay controller that matches your load requirements:
  • SPDT Relays: 5A, 10A, or 20A
  • SPST Relays: 30A
  • DPDT Relays: 1A, 3A, or 5A
Need help selecting the right relay amperage?
Use our Choosing a Proper Amperage to make the right call for your application.
💡 Relay Pros ProTip:
Most projects grow over time. With ProXR controllers, you don't have to replace your system - just add expansion boards. Scale from 16 to 256 relays using the same controller, software, and command set.