Product Code: R210RS
Setup for the R25RS RS232 relay shown above with onboard Serial and power connections. Simply connect the Power and Serial Cable and start sending commands. Quick Connect terminal block makes if easy to connect electronics.

Learn how computer controlled relays communicate and control

Learn the basics of wired communications and find the right wired controller for your application

Learn about Induction Suppression and how to counter it using Capacitors

Learn about Analog to Digital Conversion and its uses

Learn how to find the Com Port that your Device is using

Learn about the Expansion Options available to use with our controllers
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N-Button creates up to 8 desktop widgets to control relays without any programming. Order Today with This Board for Only $29 |
| Stock#: N-Button Lite | $49.00 |

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Integrated standard serial and power connector
Convenient Terminal Blocks for easy electronic connections
Highly Reliable Relay Board For Demanding Applications
This relay is equipped with terminal blocks for convenient connection of electronic devices. This controller also has on-board serial and power connector. Simply connect the power and serial cables and start sending commands. Power supply and serial cable are available during checkout.
Features include no-click startup, LED status lights, and E3C compliance. Relays can be controlled at 9600 baud and the board is compatible with ANY computer or microcontroller capable of delivering RS-232 data.
Even a no-frills design deserves a high-quality driver stage, and that's exactly what we put on this Relay controller. Fast-reacting flyback diodes help shunt dangerous voltages away from the driver circuit.
To control this Relay Controller, simply connect a data and ground wire between the board and computer or microcontroller. Provide +12 Volts DC to the board (available at checkout), and send ASCII character codes to control the relays.
This Relay Controller is fully E3C complaint, allowing up to 256 NCD devices to share a single RS-232 serial port. Mix and match up to 256 devices in any combination. Speak to each device individually or all devices at once.
Connect this board to the USB port of your computer using a USB to Serial adapter. The USB to Serial Adapter is available at checkout.
![]() The above sample demonstrates control and status read of 2 Relays. Compatible with all R2x RS-232 Series Relay Controllers. |
| The above screen shot shows one of two fully functioning dual channel samples that are available with the NCD Component Library. View all the examples on our NCD Component Library Page. |
N-Button creates widgets or buttons to control up to eight relays without any programming. A new button will be created and placed on the desktop of your computer for each relay that you want to control. N-Button Lite supports Serial Port/ USB and Network connection between PC and relay board. N-Button Manager makes it easy to add any type of button to the desktop and change the properties.
| Relay Button widgets turn relays on/off directly. It has never been so easy to control relays before. | |||
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| Relay Status widgets show status of the relay automatically right on the desktop! | |||
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N-Button Lite is available as a free download. Look for the Desktop Control section to the right to download.
N-Button Lite version supports up to 8 widgets. If you want to add more than 8 widgets, you need upgrade to the standard version.
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NEW TO RS232 COMMUNICATIONS? GET STARTED HERE Click the above link for an exclusive article on RS232 Communications |
| RS232 Relay Article | RS232 Relay Article |
| Download Manual | Download the 2 Channel RS232 Product Manual |
| E3C Complient | Download E3C Complient Specs |
| Download VB Samples | Download VisualBasic 6 Example Source Code |
| Download Software | Download Example Software and Source Code |
| NCD Component Library | The NCD Component Library is a Plug-In for Visual Studio 2005/2008 that greatly reduces software development time, effectively reducing most control operations to a single line of code. This free download includes four example applications compatible with the Pro Series. |
| Wiring Diagrams | These wiring diagrams will help you understand how to connect to your devices and use relays as a form of control logic |
| Mechanical Drawing | Mechanical Drawing for this board |
2-Channel RS-232 10-Amp SPDT Relay Controller with RS-232 Interface | |
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Quantity in Basket:
None
Code: R210RS Price: $79.00 Shipping Weight: 0.50 pounds | |
| 2-Channel RS-232 10-Amp SPDT Relay Controller with RS-232 Interface | |
Computer Control
Stand-Alone
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Visit one of our other great web sites: www.SignalSwitch.com www.controlanything.com |
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National Control Devices, LLCWorld's Largest Manufacturer of Computer Controlled Switching Devices Since 1995. |
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Please Note: Our office will be closed for Memorial Day on May 28th.