4 Channel RS232 Relay

Serial Relay  RS-232 Relay Board

Conveniently Small Size

Our Quad RS232 Relay Controller offers a conveniently small size with the integrated power of our standardized PRO relay command set. 4 Channel Relay Controllers are ideal for computer control applications where small size and high functionality are required.  We offer a large selection of Four Relay Drivers for applications ranging from low power signal switching to high voltage, high current applications. 

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.

16-Channel Expansion Relay Boards

Displaying 1 - 21 of 21 Products in this Category.
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XR1620HP
  • 16 Relays
  • Amp SPDT
  • Expansion Communication
  • Ideal Use: Power Switching
  • Expansion Series
  • Learn More
$254.00/ea
XR165
  • 16 Relays
  • Amp SPDT
  • Expansion Communication
  • Ideal Use: Power Switching
  • Expansion Series
  • Learn More
$209.00/ea
XR1610
  • 16 Relays
  • Amp SPDT
  • Expansion Communication
  • Ideal Use: Power Switching
  • Expansion Series
  • Learn More
$249.00/ea
XR16OCLP
  • 16 Channels
  • XR Port Communication
  • Expansion Series
  • Learn More
$89.00/ea
XR81DPDTOC8LP
  • 16 Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$110.00/ea
XR83DPDTOC8LP
  • 16 Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$130.00/ea
XR85DPDTOC8LP
  • Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$150.00/ea
XR81DPDTR85
  • 16 Relays
  • Amp Hybrid
  • Expansion Communication
  • Ideal Use: Mixed Switching
  • Expansion Series
  • Learn More
$210.00/ea
XR83DPDTR85
  • 16 Relays
  • Amp Hybrid
  • Expansion Communication
  • Ideal Use: Mixed Switching
  • Expansion Series
  • Learn More
$230.00/ea
XR81DPDTR810
  • 16 Relays
  • Amp Hybrid
  • Expansion Communication
  • Ideal Use: Mixed Switching
  • Expansion Series
  • Learn More
$230.00/ea
XR83DPDTR810
  • 16 Relays
  • Amp Hybrid
  • Expansion Communication
  • Ideal Use: Mixed Switching
  • Expansion Series
  • Learn More
$250.00/ea
XR85DPDTR810
  • 16 Relays
  • Amp Hybrid
  • Expansion Communication
  • Ideal Use: Mixed Switching
  • Expansion Series
  • Learn More
$270.00/ea
XR161DPDT
  • 16 Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$212.00/ea
XR163DPDT
  • 16 Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$252.00/ea
XR165DPDT
  • 16 Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$292.00/ea
XR85DPDTR85
  • 16 Relays
  • Amp Hybrid
  • Expansion Communication
  • Ideal Use: Mixed Switching
  • Expansion Series
  • Learn More
$250.00/ea
XR1610OC16LP
  • 16 Relays
  • Amp SPDT
  • Expansion Communication
  • Ideal Use: Power Switching
  • Expansion Series
  • Learn More
$288.00/ea
XR161DPDTR16OCLP
  • 16 Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$251.00/ea
XR163DPDTR16OCLP
  • 16 Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$291.00/ea
XR165DPDTR16OCLP
  • 16 Relays
  • Amp DPDT
  • Expansion Communication
  • Ideal Use: Signal Switching
  • Expansion Series
  • Learn More
$331.00/ea
XR165OC16LP
  • 16 Relays
  • Amp SPDT
  • Expansion Communication
  • Ideal Use: Power Switching
  • Expansion Series
  • Learn More
$248.00/ea
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