National Control Devices, LLC

World's Largest Manufacturer of Computer Controlled Switching Devices Since 1995.
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Dual RS232 Relay

Serial Relay  RS-232 Relay Board

Large Selection

We offer a large selection of Dual RS232 Relays for applications ranging from low power signal switching to high voltage, high current applications.  If your looking for a two channel relay controller we have a configuration to fit every need.  Our R25 and R210 series relay can be controlled at 9600 baud and are compatible with any computer or microcontroller capable of delivering RS-232 data.

RS232 Switching with a Serial Port

RS232 Relay or Serial Relay Controllers allow computer controlled switching using the Serial port of your computer.  Select NCD Serial Relay Drivers support 8-Channels of 8-Bit / 10-Bit Analog to Digital Conversion (A/D), and include an XR Relay Expansion Port for adding additional relays to the RS232 Relay Controller Board.

Supports any COM Port

An RS232 Relay supports any available COM port at any standard baud rate, allowing easy integration into any program that support serial communications. The RS232 Relay is ideally suited for applications that require data collection and control from a single device. Built-in temperature sensor allows temperature monitoring, analog to digital conversion, and relay control from a single device. RS-232 Interface Supports baud rates up to 115.2K Baud.

Easy Connection with the Quick Start Kit

The video shows how easy it is to connect an RS232 Relay to the computer with the optional Quick Start Kit.  The R45Pro Quad Relay Controller is shown connected to the optional QS12 Quick Start Kit.

2-Channel RS-232 Relay Boards

R25
2-Channel 5-Amp Latching Relay Board
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$59.00
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R210
2-Channel 10-Amp Latching Relay Board
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$69.00
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R21DPDT
2-Channel 1-Amp DPDT Small Signal Latching Relay Board
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$59.00
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R23DPDT
2-Channel 3-Amp DPDT Signal Latching Relay Board
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$64.00
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R25DPDT
2-Channel 5-Amp DPDT High-Current Signal Latching Relay Board
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$69.00
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R220
2-Channel 20-Amp SPDT High-Power Latching Relay Board
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$79.00
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R230
2-Channel 30-Amp SPST High-Power Latching Relay Board
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$89.00
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ADR220PROXR
RS-232 Latching Relay Board 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
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$104.00
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ADR230PROXR
RS-232 Latching Relay Board 2-Channel 30 Amp SPST + 8-Channel 8/10-Bit A/D
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$114.00
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R25RS
Dual Channel 5-Amp SPDT Relay Controller with RS-232 Interface
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$69.00
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R210RS
Dual Channel 10-Amp SPDT Relay Controller with RS-232 Interface
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$79.00
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R220HP
LOW COST Dual Channel 20A SPDT RS-232 Relay Controller
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$24.00
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R220HPRS
LOW COST Dual Channel 20A SPDT Relay Controller with RS-232 Interface
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$34.00
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R220RS
Dual Channel 20A SPDT Relay Controller with RS-232 Interface
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$89.00
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R230RS
Dual Channel 30A SPST Relay Controller with RS-232 Interface
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$99.00
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R21DPDTCNRS
2-Channel 1-Amp DPDT Relay Controller with RS-232 and Relay Interface
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$79.00
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R23DPDTCNRS
2-Channel 3-Amp DPDT Relay Controller with RS-232 and Relay Interface
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$84.00
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R25DPDTCNRS
2-Channel 5-Amp DPDT Relay Controller with RS-232 and Relay Interface
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$89.00
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R21DPDTCN
2-Channel 1-Amp DPDT RS-232 Relay Controller with Relay Interface
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$69.00
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R23DPDTCN
2-Channel 3-Amp DPDT RS-232 Relay Controller with Relay Interface
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$74.00
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R25DPDTCN
2-Channel 5-Amp DPDT RS-232 Relay Controller with Relay Interface
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$79.00
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About National Control Devices
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National Control Devices, LLC

PO Box 455 - Osceola - MO - 64776
Phone: 417.646.5644 - Fax: 866.562.0406
Open 9AM-4PM Central Standard Time
http://www.relaycontrollers.com/