RS232 Relay All The Features You Need...
- 4 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
- ProXR Versions
- Full ProXR Command Set
- Expandable to 256 Relays
- 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 4 Channel RS232 Relays for applications ranging from low power signal switching to high voltage, high current applications. If your looking for a four 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, ProXR and ProXR Lite Versions.
Simple Reliable RS232 Relay Control
Control these RS232 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
By 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 RS232 Relay Board
Below you will find the 4-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. DPDT versions are also available with 1, 3 or 5 amp relays installed. For more information on selecting the correct relay for your application see
Choosing a Proper Amperage.
Selecting an RS232 Relay Series
The 4-Channel boards are available in Pro, ProXR Lite and ProXR 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 full ProXR and ProXR Lite models. ProXR and ProXR Lite versions have the ProXR firmware installed and accept the full ProXR command set, the industry leading command set for controlling relays. The ProXR Lite version is non-expandable, the ProXR version is expandable to 256 relays. When you find your controller click on the Full Description link to view full specs, watch setup videos, download software and purchase.
