Visit one of our
other great web sites:


Visit Ozarks AV for the best in AV Equipment

Visit AgriSwitch.com for the best in Agricultural Switching

We Accept:



RS232 Relay - 1 Channel

RS232 Relay Control

RS232 Relay

RS232 Relay All The Features You Need...

  • 1 Relays Installed on Circuit Board
  • Solder on connections on select boards
  • Mounts as a Virtual COM Port on Computer
  • Base Station Software gets you up an running fast
  • Pro Versions
      - Limited Command Set
      - Not Expandable
  • ProXR Lite Versions
      - Full ProXR Command Set
      - Not Expandable
  • Program in almost any language


RS232 Relay
RS232 Relay Controller Board

Our RS-232 Relays make it easier than ever to add computer controlled switching to your most demanding applications.  We offer a large selection of 1 Channel RS232 Relays for applications ranging from low power signal switching to high voltage, high current applications.  If your looking for a 1-channel relay controller we have a configuration to fit every need.  RS232 Relays offer excellent communication, speed, and reliability with minimal integration time.  RS232 Relay supports any available COM port at any standard baud rate with a maximum supported baud rate of 230.4K Baud.

RS232 Relay Options
USB Relays are available with SPDT 5, 10 and 20 amp, SPST 30 amp and DPDT 1, 3 & 5 amp relays installed.  In Pro and ProXR Lite Versions.

Simple Reliable RS232 Relay Control
Control ProXR Lite Relays with a DB9 or direct wire connection.  The controller mounts as a virtual COM port for easy programming
Program in Almost Any Language!

Selecting The RS-232 Interface

RS232 Relay ZRSB ModuleBy selecting the RS232 interface you will be sending commands to the board through either a DB9 or direct wire interface.  Boards on this page are equipped with a ZRS communications module that adds RS-232 communications to the board.  At checkout you will have three modules to choose from with either a DB9 or direct (3-wire) connection.  A command consists of a few bytes of data in numerical format usually between 2 and 6 bytes.  Once the command has been received, the controller processes the command and the relay activates.

Selecting an RS-232 Relay Board

Below you will find the 1-channel RS232 Relay control that are available.  The difference being the amperage of the relays installed and the type of relay.  Choose the controller that fits the amperage you are switching.  You will find SPDT relays in the 5, 10 and 20 amp versions and an SPST version in 30 amp.  For more information on selecting the correct relay for your application see Choosing a Proper Amperage.

Selecting an RS-232 Relay Series

The 1-Channel boards are available in Pro and ProXR Lite versions.  The Pro versions offer a no-frills design that's fully EC3 compliant and the Pro Firmware installed - a smaller command set than our ProXR Lite models.  ProXR Lite versions have the ProXR firmware installed and accept the full ProXR command set, the industry leading command set for controlling relays.  Both Pro and ProXR Lite versions are non-expandable.  When you find your controller click on the Full Description link to view full specs, watch setup videos, download software and purchase.


1-Channel RS232 Relays
R110
RS232 Relay 1-Channel 10-Amp SPDT
Screw Terminal Relay Connections
  • 1 - 10 Amp SPDT Relay(s)
  • Serial Interface
  • Screw Terminal Connections
  • Quick Start Kit Needed for DB9 Connection
R110PL_ZRS
ProXR Lite RS232 Relay
1-Channel 10-Amp SPDT Relay Installed
  • 1 - 10 Amp SPDT Relay(s)
  • 8 Variable Sensor Input(s)
  • DB9 or Direct Wire Interface
  • Screw Terminal Connections
  • 16 Available Timers
  • ProXR-Lite Series
R110RS
RS232 Relay 1-Channel 10-Amp SPDT
Screw Terminal Relay Connections
  • 1 - 10 Amp SPDT Relay(s)
  • RS232 Relay Interface
  • Onboard DB9 Connection
  • Screw Terminal Connections
R120
RS232 Relay 1-Channel 20-Amp SPDT
Direct Relay Connection
  • 1 - 20 Amp SPDT Relay(s)
  • Serial Interface
  • Direct Relay Connection
  • Quick Start Kit Needed for DB9 Connection
R120HPRS
LOW COST 1-Channel 20A SPDT Relay Controller with RS-232 Interface
  • 1 - 20 Amp SPDT Relay(s)
  • Serial Interface
  • Economy Series
R120PL_ZRS
ProXR Lite RS232 Relay
1-Channel 20-Amp SPDT Relay Installed
  • 1 - 20 Amp SPDT Relay(s)
  • 8 Variable Sensor Input(s)
  • DB9 or Direct Wire Interface
  • Direct Relay Connection
  • 16 Available Timers
  • ProXR-Lite Series
R120RS
RS232 Relay 1-Channel 20A SPDT Relay
Direct Relay Connection Onboard DB9 Connector
  • 1 - 20 Amp SPDT Relay(s)
  • Serial Interface
  • Direct Relay Connection
  • Onboard DB9 Connection
R130
RS232 Relay 1-Channel 30-Amp SPST
Direct Relay Connection
  • 1 - 30 Amp SPST Relay(s)
  • RS232 Interface
  • Direct Relay Connection
  • Quick Start Kit Needed for DB9 Connection
R130PL_ZRS
ProXR Lite RS232 Relay
1-Channel 30-Amp SPST Relay Installed
  • 1 - 30 Amp SPST Relay(s)
  • 8 Variable Sensor Input(s)
  • DB9 or Direct Wire Interface
  • Direct Relay Connection
  • 16 Available Timers
  • ProXR-Lite Series
R130RS
RS-232 Relay 1-Channel 30A
Direct Relay Connection Onboard DB9 Connector
  • 1 - 30 Amp SPST Relay(s)
  • RS232 Interface
  • Direct Relay Connection
  • Onboard DB9 Connection
R15
RS232 Relay 1-Channel 5-Amp SPDT
Screw Terminal Relay Connections
  • 1 - 5 Amp SPDT Relay(s)
  • Serial Interface
  • Screw Terminal Connections
  • Quick Start Kit Needed for DB9 Connection
R15PL_ZRS
ProXR Lite RS232 Relay
1-Channel 5-Amp SPDT Relay Installed
  • 1 - 5 Amp SPDT Relay(s)
  • 8 Variable Sensor Input(s)
  • DB9 or Direct Wire Interface
  • Screw Terminal Connections
  • 16 Available Timers
  • ProXR-Lite Series
R15RS
RS232 Relay 1-Channel 5-Amp SPDT
Screw Terminal Relay Connections
  • 1 - 5 Amp SPDT Relay(s)
  • Serial Interface
  • Screw Terminal Connections
  • Onboard DB9 Connection
SSR1xRS
1-Channel Solid State Relay Controller with RS-232 Interface
  • 1 - Optional Amp Solid-State Relay(s)
  • Serial Interface
  • Economy Series