USB Relay Control

Mounts as a Virtual COM Port

The USB Relay connects directly to your computer's USB port and appears as a standard COM port. On Windows machines with internet access, the correct FTDI drivers install automatically.

Once powered, the board listens for compact serial commands - typically 2 - 6 bytes. After processing your command, it returns ASCII code 85 to confirm successful completion.

USB Communications Module

The USB Relay module makes controlling relays simple. Plug it into any available USB port and begin sending standard serial commands to switch relays or read A/D inputs.

Every NCD USB interface uses a genuine FTDI FT232-RL USB-to-Serial converter chip for maximum stability and cross-platform support. With drivers available for Windows, macOS, Linux, and more, the module communicates using a Virtual COM Port for easy software integration.

Once installed, open the COM port at 115.2K baud and start exchanging data immediately. On-board USB, TX, and RX LEDs provide live communication feedback. The module uses a durable USB Mini connector - our preferred interface for longevity and reliability.

Simply download the latest Base Station Software, install it on your Windows PC, and your COM port will appear automatically, ready for communication.

Virtual COM Port

A Virtual COM Port (VCP) registers as a standard serial port on your computer, allowing you to use new or existing serial-based software with any NCD Industrial controller.

Because VCP communication is one of the easiest and most universally supported communication formats across operating systems, languages, and hardware platforms, the ZUSB USB Interface is the ideal tool for learning, testing, and operating NCD devices.

Induction Considerations

For most applications, the onboard capacitors provide more than enough suppression, and users will never encounter communication issues.

However, switching inductive loads such as motors can create higher levels of electrical noise, and in those situations additional precautions may be necessary. Testing is recommended for motor-based installations to ensure reliable communication.

If communication problems do occur in these high-induction environments:

• An RS-232 communications module provides a more noise-resistant interface.
• When USB connectivity is still needed, a USB-to-RS-232 adapter paired with the RS-232 module offers the stability of RS-232 with the convenience of USB.
• RS-232 naturally blocks induction to safer levels, allowing the adapter to operate without errors even in demanding motor-control setups.

For all other users and non-motor applications, standard USB operation typically performs without complications.

The ProXR DPDT Relay Board

Easy Software Development

Most of our customers write their own program for controlling these devices. Since you can use almost any programming language, you can use one that is most familiar to you so you don't have to learn a new language.  These boards support the Serial Port Profile, meaning they will mount to the computer as a virtual com port. This makes it very easy to send commands to the device.

Plug-In for Visual Studio

The NCD Component Library is a plug-in for the Visual Studio 2005/2008 that greatly simplifies the communications to the NCD product line. The samples can be run in Visual Studio and full customization to your needs.  Over 40 samples included with this free download!  Component Library.

Base Station Software

Base Station Software was designed to help you learn the ProXR command set.  Explore ProXR features using it's Graphical User Interface.  Watch data bytes flow to and from the board, so you easily understand the command execution process.  There is no faster or easier way to learn how to automate than Base Station, as it was designed to work with the complete array of communication modules.  Base Station software supports every feature of this device - no other controller manufacturer even comes close to offering this type of software. 

Essential Power Requirements

Applying Good clean power to the board is essential for the operation of the board.  Not only for the switching of the relays but the firmware that processes the commands.  Without good steady clean power from a regulated power supply the board simply will not function correctly.  All boards on the site require 12 VDC power.  The PWR12 US power supply is a 120VAC to 12VDC 1.25A 60Hz regulated power supply and it plugs into the barrel connector on the board.  The output connector is a 2.1mm I.D. x 5.5mm O.D. x 9.5mm Female R/A barrel connector.  We also carry an international power supply with interchangeable adapters for international customers. Learn More

Read Analog Sensors

This ProXR controller offers a 8-Channel 8/10-Bit Analog to Digital Converter in addition to relay control.  Read and control from 8 sensors per board from 0 to 5 volts!

ProXR Enhanced Firmware Installed

This board has ProXR Firmware installed that responds to the full ProXR Command Set.  The ProXR Firmware is the industry leading firmware for controlling relays with more commands and functionality than any other board on the market.  The list of commands and parameters this board is capable of is extensive.  ProXR Enhanced is the newly released enhance version of the ProXR Firmware with more commands, more functionality and better control than ever before!  For a detailed list of all the commands with descriptions see our ProXR Enhanced Command Set.

DPDT Relays Installed

This board has DPDT relays installed.  A single DPDT relay is made up of 2 SPDT switches.  Each relay acts as two switches that are activated at the same time.  This allows two independent signals to be switched at one time.  In effect, there are two independent switches on a single DPDT relay - they will always switch together.  There are two connectors with Normally Open, Normally Closed and Common for each relay allowing two separate connections.  The diagram below shows the how the arms of the common swing from the Normally Closed to the Normally Open positions when energized.  Wiring to either the NO or NC can produce your desired results.

2-Million Cycles

ProXR series controllers are designed for long life, you should expect to get years of service from your controller and literally 2-million cycles from the relays on board.  With a 5-year warranty and a money back guarantee you have nothing to loose!  Place your order now, while everything is in front of you.

This Board is RoHS Compliant

This board is led free and RoHS Compliant.  If your requirements are for RoHS compliant parts this board is manufactured with RoHS compliant led free parts and solder.

Add Relays as Your Needs Grow

The ProXR series controllers are expandable up to 256 total relays.  The controller is fitted with an XR Expansion Port where you can add expansion boards to this relay.  Expansion boards can be added until you reach 256 total relays.  The Expansion Boards get their logic from the main board and will require 12 VDC power. Expansion boards do not need to be the same relay amperage as the main board or other expansion boards.

16 User-Programmable Timers

The ProXR Series controllers have 16 user-programmable timers. Each independent timer can be assigned to any relay, and can be programmed to hold the relay in the On state, or to pulse the relay at the end of the timer.  The ProXR timing features are ideally suited for Watchdog, Keep Alive, and Server Reboot applications, as well as sprinkler systems, gate openers, and lighting applications.  Relay Timing Features support two modes of operation: Duration and Pulse. Duration timing is ideally suited where a device should be activated for a period of time. Pulse timing mode is designed specifically for server reboot applications, whereby, if the timer is not reset periodically by your software, the timer will run out and reboot your computer.

5-Year Warranty/Money Back Guarantee

ProXR series controllers are guaranteed against manufacturing and functionality defects for a full 5 years!  Not to mention a 30-day money back guarantee!  If for any reason you are not happy with a relay purchased from Relay Pros, simply return it within 30 days and we will give you your money back!  Controllers that are damaged by our customers will not of course be warranted under any circumstances. 

Induction Suppression

Perhaps the most overlooked aspect of relay control is proper handling of inductive loads. Inductive loads can best be defined as anything with a magnetic coil, such as a motor, solenoid, or a transformer.  Controlling a inductive load using this relay board requires an induction suppression capacitor for each relay being used.  The purpose of this capacitor is to absorb the high voltages generated by inductive loads, blocking them from the contacts of the relay.  Without this capacitor, the lifespan of the relay will be greatly reduced.  Induction can be so severe that it interferes with the logic of the board, causing relay banks to shut down unexpectedly.  For more information view our Induction Suppression Video.

Shipping

The boards sold are brand new units shipped from our office conveniently located in Missouri.  These boards are completely tested before they are released for shipping  With so many boards on our site it is impossible to stock boards, please allow two to three days production time for your order to ship.  If you have any questions please feel free to call our office at 800-960-4287 or e-mail us at sales@relaypros.com.

ProXR Control Is Here!

A more streamlined manufacturing process brings a more durable, reliable and better relay board to the market.  Here's a lists of great features:

User Friendly Board Design
• "Wall Wart" or direct power capability
• Relay status light bar
• XR Expansion Port - easily add more relays
• Easy screw terminal connections
• DPDT Relays with 2 connections per relay

ProXR Features
• Works with the full ProXR Enhanced Command Set
• 8-Channel 8/10-Bit Analog to Digital Converter
• Highly reliable relay with industry leading command set
• 16 programmable timers available

The ProXR Command Set

ProXR Firmware

The firmware on the Ethernet Relay board supports the ProXR Command Set, offering more commands and functionality than any other relay board on the market! The list of available commands and parameters is extensive, giving you full control. You can write your own control program in almost any programming language.

Key Features

• Extensive Command Set: More commands and functionality than any other relay board.
• Programming Flexibility: Compatible with nearly any programming language.
• User-Friendly Software: Free software available for non-programmers to easily control relays without coding.

Introduction

The ProXR Series Controllers allow you to control up to 2048 relays depending on your controller model.  Relays are divided into groups of 8 called banks, and are addressed by their bank number.  For instance, a ProXR series controller with 32 on-board relays has four on-board banks, the on-board relays respond to bank values of 1-4.  If you use the XR Expansion port to add another bank of 24 relays, then you will need to specify bank values of 5-7 to control the extra relays.  The firmware doesn’t actually know how many relays are attached to the relay controller, it is up to the user to define how many relays are attached to the controller using Base Station Software.  The ProXR CPU will assume you have connected the maximum number of supported relays to your controller.  In the ProXR Quick Start Guide, you will see two commands that appear to do the same thing, for example:

  254 0-7 Turn Off Individual Relays
  254 100-107 Bank# Turn Off Individual Relays in Bank
  254 8-15 Turn On Individual Relays
  254 108-115 Turn On Individual Relays in Bank
  254 16-23 Get the Status of an Individual Relay
  254 116-123 Bank# Get the Status of an Individual Relay in Bank
While the outcome is the same, these commands function in slightly different ways.

For instance:
  254 8 Turn On Relay 1
To make this command work, you will send a 254, then a 8 to activate a relay. By default, relay bank 1 will be affected by this command. However, you can redirect this command to a different relay bank using the following command:
  254 49 2  Direct Commands to Relay Bank 2
Then you can send:
  254 8 Turn On Relay 1 in Bank 2

Here are a few more Bank Specified Examples:
  254 49 1 Direct Commands to Relay Bank 1
  254 8 Turn On Relay 1 in Bank 1
  254 49 2 Direct Commands to Relay Bank 2
  254 8 Turn On Relay 1 in Bank 2
  254 9 Turn On Relay 2 in Bank 2
  254 10 Turn On Relay 3 in Bank 2
  254 49 3 Direct Commands to Relay Bank 3
  254 8 Turn On Relay 1 in Bank 3
  254 11 Turn On Relay 4 in Bank 3
  254 12 Turn On Relay 5 in Bank 3
  254 13 Turn On Relay 6 in Bank 3
  254 14 Turn On Relay 7 in Bank 3
  254 49 0 Direct Commands to All Relay Banks
  254 8 Turn On Relay 1 in All Relay Banks

This command structure has the advantage of being very fast and efficient. However, if power to the controller is ever lost, commands will automatically be directed to bank 1 when power to the controller has been restored. This command methodology is generally advisable for ProXR controllers with 8 or fewer relays. When working with more than 8 relays, we generally advise users to use Bank Directed commands as shown in the following examples.

Turns Off Relays in the Currently Selected Relay Bank

This command will control the Off status of specified relays in the Currently Selected Relay Bank.  This command has optional parameters <1-7> for controlling the Off status of the remaining relays, 1 being the next relay in sequence, 2-7 being all possible subsequent relays in the selected relay bank.  A value of 0 refers to the first relay in the specified relay bank, 7 being the 8th and final relay of the selected Relay Bank. This command sends byte value 85 back to the user when the operation has been completed.

Send Bytes:	Byte 1:	Byte 2:	Byte 3:
Function:	Command	Command	Optional Parameters
Decimal Values:	254	0-7	1-7
Hex Values	0xFE	0x00 - 0x07	0x01 - 0x07
Receive Byte:	Decimal:	85
	Hex:	0x55

Turns On Relays in the Currently Selected Relay Bank

This command will control the On status of specified relays in the Currently Selected Relay Bank.  This command has optional parameters <1-7> for controlling the On status of the remaining relays, 1 being the next relay in sequence, 2-7 being all possible subsequent relays in the selected relay bank.  A value of 0 refers to the first relay in the specified relay bank, 7 being the 8th and final relay of the selected Relay Bank.  This command sends byte value 85 back to the user when the operation has been completed.

Send Bytes:	Byte 1:	Byte 2:	Byte 3:
Function:	Command	Command	Optional Parameters
Decimal Values:	254	8-15	1-7
Hex Values	0xFE	0x08 - 0x0F	0x01 - 0x07
Receive Byte:	Decimal:	85
	Hex:	0x55

Read the Status of Relays in the Currently Selected Relay Bank

This command will report the On/Off status of Relays 0-7 in the Currently Selected Relay Bank.  This command sends byte value of 0 of 1 back to the user when the operation has been completed, 0 reporting an Off status and 1 reporting an On status.

Send Bytes:	Byte 1:	Byte 2:
Function:	Command	Command
Decimal Values:	254	16-23
Hex Values	0xFE	0x10 - 0x17
Receive Byte:	Decimal:	0 or 1
	Hex:	0x00 or 0x01

Full Command Set

These are only a few examples from the ProXR Command set so you can get an idea of the command structure.  Download the ProXR Quick Start Guide to view the full command set ProXR Quick Start Guide.

Base Station Software

Base Station Software was designed to help you learn the ProXR command set!  No other relay board manufacturer even comes close to offering this type of software!  Explore ProXR features using it's Graphical User Interface.  Watch data bytes flow to and from the board, so you easily understand the command execution process.  There is no faster or easier way to learn how to automate than Base Station, as it was designed to work with all the communication modules we offer!  You only need a Windows 8 or 10 Computer to Run Base Station. 

Base Station Features

There are some useful features to look for when using Base Station Software to control, test, or configure your device:

• At the bottom left corner of each window there is a link to relevant documentation for your device
• In the Control Command Set Window, and many others, there is a MORE or LESS option at the top right corner.  Selecting MORE allows you to view specific communication details.
• All the functions of the command set are available as a point-and-click interface plus you can see the command that is being sent to the board!

The AD8 Command Set

Reading Switches/Variable Resistance Signals

This board is equipped with 8-Channels of 8/10-Bit Analog to Digital Converters, capable of reading analog voltages from 0 to 5 Volts DC.  The ADCs on this controller allow monitoring of external sensors or contact closure input detection.  Connect external temperature sensors, light sensors, current sensors, buttons, switches, or anything else that generates a 0-5VDC analog or contact closure output.  With 8-bit resolution, analog inputs will convert 0-5 Volt signals into a value from 0 to 255.  With 10-bit resolution, values of 0 to 1023 may be measured.  Input resolution is software selected.  Simply ask the controller for the analog value of each input, and the controller instantly responds.

Analog Inputs Controlling Relays

ProXR AD8 controllers allow you to map analog inputs for direct control of on-board relays.  Inputs can be configured to flash relays, turn relays on or off, toggle the relay state, send push notification data, and much more.

Analog to Digital Connections

AD8 Series controllers allow users to monitor sensors and switches.  A/D inputs should never be left “floating,” which simply means all inputs MUST connect to something (such as a voltage or ground).  To prevent inputs from floating, a 10K Resistor connects each input to +5 or Ground using the pull up/down jumper.  While this 10K resistor does slightly interfere with the signal, its benefits far outweigh the consequences of leaving inputs floating.

AD8 Command Set

The AD8 Command Set is used to read analog voltages on controllers equipped with an 8-Channel 8/10-Bit Analog to Digital Converter.  The AD8 Command Set converts a Voltage from 0 to 5 Volts DC into numeric value.  The AD8 Command Set supports 8-Bit Analog to Digital Conversion, which converts 0-5VDC to a numeric value from 0 to 255.  The AD8 Command Set also supports 10-Bit Analog to Digital Conversion, which converts 0-5VDC to a numeric value from 0 to 1023.  Since 10-Bit Values must be communicated using two bytes, the following formula must be used to reconstruct the 10-Bit Value:
10BitValue = (MSB*256)+LSB 'Converts 2 Bytes into a Value from 0 to 1023

Reads the 8-Bit Analog Input of Channels

This command will read the Analog Input of Channels 1-8 and return an 8-bit value for each.

Send Bytes:	Byte 1:	Byte 2:
Function:	Command	Parameter (Channel 1-8)
Decimal Values:	254	150-157
Hex Values	0xFE	0x96 - 0x9D
Receive Byte:	Decimal:	0-255
	Hex:	0x00-0xFF

Full Command Set

These are only a few examples from the AD8 Command Set so you can get an idea of the command structure.  Download the AD Quick Start Guide to view the full command set AD Quick Start Guide.

Base Station

Base Station will allow you to read the inputs and will even show you the commands being sent from Base Station so you can use them in your own programming. 

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Relay Activator

Relay Activator and Analog Inputs

The Relay Activator control panel allows analog inputs to directly control relays!  Simply connect the analog inputs to buttons or switches and trigger basic relay on or off functions to take manual control of the on-board relays.  The Relay Activator control panel allows you to define 8 functions for each of the 8 inputs.  Functions include turning relays on or off, toggling the state of relays, momentarily flash a relay, momentarily toggle the flashing function of a relay, turn all relays on, turn all relays off, and push notification events.  When push notification events are configured, the controller generates a packet of data every time the inputs change state.

Relay Activator for Manual Control

Relay Activator is great for applications where computer control is used but manual control is necessary at times.  Buttons or switches can be used to take manual control of any of the relays.  You will have the ability to turn a relay on with a computer and turn the relay off with the manual switch!  Download the Relay Activator Quick Start Guide here: in the AD8 Relay Activator Quick Start Guide.

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N-Button Software

Create Desktop Meters

Using N-Button software desktop Meters can be created for real time level readings of a sensor connected to the AD8 inputs!  "It's like having a meter right on your desk for constant monitoring".  Meters can be created for temperature sensors, moisture sensors, light meters and others as long as their output is between 0 and 5 volts.  Create a live at-a-glance determination of the sensor.  There are 8 inputs on the board so you can create a meter for each of the input and label them, our meter here is labeled Soil Moisture.  Best of all the increments on the meter can be fully customized to fit your needs.  N-Button Lite and N-Button Pro can be purchased at checkout.
Visit our N-Button Page

N-Button Pro

Relay Software

N-Button Pro is a 3rd Party Software that is purchased separately that will allow you to control the relays without programming. On the surface the software seams basic but don't be fooled this is a robust software with many applications.

Create Buttons & Widgets

N-Button Pro/Lite creates widgets that float on your desktop to control external devices, send specified data, run applications, send HTTP requests or send data lists.  It supports Serial Port/USB and Network connections between the PC and devices.  It allows you to access and control the widgets remotely.  Through an internet browser, you can control your devices from anywhere with your computer, iPhone, iPad, Android tablet, Windows tablet as well as Linux and Mac!  N-Button Pro/Lite makes it possible to control your devices without any programming with mostly a point-and-click interface!  It supports special widgets developed specifically for the boards on the site.

Supports Up To 255 Widgets

N-Button Pro supports up to 255 widgets and can accommodate any ProXR board and all expansion boards.  If your application requires controlling more that 16 relays N-Button Pro should be your choice.

USB and Network Compatible

N-Button Pro supports Serial Port/ USB and Network connection between the PC and the relay board. Add any type of included N-Button Lite widgets with N-Button Pro Manager. It's also very easy to modify the widget's properties to get the button and configuration you are looking for. N-Button Lite will control most relays on this site. N-Button Lite is not compatible with Reactor/Key Fob or Taralist relay since these controllers have their own configuration software included with the board or MirC/MirX controllers since these don't require any software or programming at all.

Create Relay Buttons

Relay Button Widgets turn on/off relays directly.  It has never been easier to control relays, no programming skills required!  Create a button that turns a relay on and another one to turn the relay off or create a button that toggles (one click turn relay on another turns it off).  It's up to you and easy to configure with a point-and-click interface!

Create Custom Buttons

When you create custom buttons in N-Button Pro you can use any of the commands that are in a ProXR Command Set (provided you purchase a ProXR relay) the industry leading command set and it's quite extensive!  These buttons will be on your desktop of your computer and when you click on a button it will send the command to the board provided the board is connected to the computer.  You can also change the shape, color and text of each button so you will know exactly what each button controls.  The color can even change with the status of the relay (on or off)!

Create Relay Status Widgets

Relay Status widgets shows the status of the relay automatically. Just a glance at your desktop will show the status of the relay!

Create Desktop Meters

Desktop Meters can be created for real time level readings of any variable input sensor.  "It's like having a meter right on your desk for constant monitoring".  Meters can be created for temperature sensors, moisture sensors, light meters and others.  Read the sensor and create relay buttons that will allow at-a-glance determination of the relay status.  Best of all the increments on the meter can be fully customized to fit your needs.  Choose an Analog to Digital controller (look for AD in the part number) purchase a copy of N-Button Pro or N-Button Lite and you can read the A/D levels right on your desktop!   If you have an application where you need to track sensor levels you will have a live real time meter right on your desktop!

Backgrounds

Add some style to your desktop with N-Button Pro and N-Button Pro you can create backgrounds and holders for your buttons like the virtual Key Fob.  Create your own button functions or use one of our pre-installed "V" Fobs ready for download.

Control More Than Just Relay Boards

Customized Button widgets can be set to send specified data to any other connected devices besides relay boards. It can be set to open a file, a folder or a program, run any application or send http request. It also supports send data list.  A group of data can be sent to serial port or IP address just by clicking the created button.

The XR Expansion Port

Add Relays as Your Needs Grow

ProXR Controllers were built with relay expansion in mind.  The XR Expansion Port is used to add banks of external relays to a ProXR or Taralist board equipped with a XR Expansion port.  The ProXR and Taralist boards are fitted with an XR Expansion Port where you can add expansion boards.  Expansion boards can be added until you reach 256 total relays.  As you continue to chain expansion boards onto an XR expansion port, the total number of available relay banks will increase.  Add expansion boards as needed in the future, whenever you require more relays simply order another expansion board.

Linking XR Expansion Boards Together

XR Expansion Boards consist of a XR Input and XR Output Connector.  Simply connect the XR Output of your ProXR Board to the XR Input located on the relay expansion board.  Chaining more relays is easy.  Simply connect the XR Output of your ProXR expansion board to the XR Input of your next expansion board.  Mix and Match different relay types as your application requires.  A 6″ expansion cable is included with the expansion board.  It's important to keep the cabling as short as possible.  Not all users will be able to expand to 256 total relays, as it all depends on the installation, the amount of electrical interference, and the overall cable length.  For best compatibility, the total length of the ProXR controller and all of the expansions and cabling should not exceed 1 or 2 meters.

Will Not Operate Independently

This Expansion Board gets it's commands from the main ProXR or Taralist board and will not operate independently.  This board MUST be plugged into a ProXR or Taralist board to operate and will not function on it's own.

Essential Power Requirements

This and all expansion boards require 12 VDC to operate.  We offer a wall-wart type power supply at checkout if you need to plug this into a 110 wall outlet.  Applying Good clean power to the board is essential for the operation of the board.  Without good steady clean power from a regulated power supply the board simply will not function correctly.  The PWR12 US power supply is a 120VAC to 12VDC 1.25A 60Hz regulated power supply and it plugs into the barrel connector on the board.  The output connector is a 2.1mm I.D. x 5.5mm O.D. x 9.5mm Female R/A barrel connector.  We also carry an international power supply with interchangeable adapters for international customers. Learn More

Maximum Relay Rating Notes

ProXR is capable of expanding to an absolute maximum of 256 Relays.  In some cases, it may not be possible to control all 256 relays, particularly in applications where high noise levels may be involved.  Experimentation may be required, as it is not possible for us to guarantee all users will be able to utilize all 256 relays in every application.  Noise tends to accumulate when several expansions are connected together.  For best results, the XR expansion cables must be as short as possible.

DPDT Relays Installed

This board has DPDT relays installed.  A single DPDT relay is made up of 2 SPDT switches.  Each relay acts as two switches that are activated at the same time.  This allows two independent signals to be switched at one time.  In effect, there are two independent switches on a single DPDT relay - they will always switch together.

There are two connectors with Normally Open, Normally Closed and Common for each relay allowing two separate connections.  The picture above shows the 4-channel connectors.  The diagram to the right shows the how the arms of the common connector swing from the Normally Closed to the Normally Open positions when energized.  Wiring to either the NO or NC can produce your desired results.

Mix & Match

Expansion boards do not need to be the same relay amperage as the main board or other expansion boards.  Mix & match expansion board to get the exact amperage for your switching needs. 

2-Million Cycles

ProXR series controllers are designed for long life, you should expect to get years of service from your controller and literally 2-million cycles from the relays on board.  With a 5-year warranty and a money back guarantee you have nothing to loose!  Place your order now, while everything is in front of you.

This Board is RoHS Compliant

This board is led free and RoHS Compliant.  If your requirements are for RoHS compliant parts this board is manufactured with RoHS compliant led free parts and solder.

5-Year Warranty/Money Back Guarantee

ProXR Lite series controllers are guaranteed against manufacturing and functionality defects for a full 5 years!  Not to mention a 30-day money back guarantee!  If for any reason you are not happy with a relay purchased from Relay Pros, simply return it within 30 days and we will give you your money back!  Controllers that are damaged by our customers will not of course be warranted under any circumstances. 

Shipping

The boards sold are brand new units shipped from our office conveniently located in Missouri.  These boards are completely tested before they are released for shipping  With so many boards on our site it is impossible to stock boards, please allow two to three days production time for your order to ship.  If you have any questions please feel free to call our office at 800-960-4287 or e-mail us at sales@relaypros.com.

Accessories

Relay Logic

Relay Wiring Samples

This page provides simple examples showing how to wire a single relay - or multiple relays - for common switching applications. We use a light as the example load, but you can substitute a gate controller, security panel input, dry contact device, motor trigger, or most other switched loads. These wiring samples demonstrate different ways to connect relays to achieve the switching behavior you need.

Get a printout of this page

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SPDT Wiring

SPDT (Single Pole Double Throw) relays include three terminals: Common (COM), Normally Open (NO), and Normally Closed (NC).

• When the relay is off, COM is connected to NC.
• When the relay is energized, COM switches to NO.

Your load can be wired to either the NO or NC terminal depending on whether you want the device to turn on when the relay activates or when it releases. Examples below demonstrate both wiring methods.

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SPST Wiring

SPST (Single Pole Single Throw) relays provide two terminals: Common (COM) and Normally Open (NO).

When the relay coil is energized, COM connects to NO to power the load. The only SPST relays offered on this site are our 30-Amp models. All SPST examples shown on this page apply to these relays as long as the example does not require a Normally Closed terminal.

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DPDT Wiring

A DPDT (Double Pole Double Throw) relay contains two SPDT switches that operate together.

• Each side includes its own COM, NO, and NC terminals.
• Both internal switches change state at the same time.

This allows you to control two independent circuits with one relay. Wiring for each side of a DPDT relay follows the same rules as an SPDT relay, so the examples on this page apply directly.

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Relay Logic Examples

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Example 1 - Simple Off/On Control

This example shows the most basic way to use a relay to switch a device such as a light. When the relay energizes, its NO (Normally Open) contact closes to COM (Common), completing the circuit and turning the light on.

Only a single power wire is switched in this setup, making it the simplest method for controlling a light - or any device - using a relay.

Use this example for switching a light or any device you want to power only when the relay is on.

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Example 2 - Simple On/Off (Using NC Contact)

This wiring method keeps the device on by default. The relay switches a single power wire through the COM (Common) and NC (Normally Closed) terminals.
When the relay is not energized, the NC contact is closed to COM and the light remains on.
When the relay energizes, the NC contact opens, interrupting power and turning the light off.

This approach is ideal for devices that stay on most of the time, reducing relay wear since it doesn't need to remain energized to keep the device powered. It's also a useful method for power-cycling equipment - energizing the relay momentarily will turn the device off.

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Example 3 - AND Logic Using Two Relays

This example shows how two relays can work together so a light turns on only when both relays are energized. This creates an AND Logic condition:
Relay 1 AND Relay 2 must be on for the light to receive power.

A single power wire is switched, but it must pass through both relay contacts before reaching the light. This setup is ideal when two conditions must be met at the same time - such as requiring input from multiple sensors or system parameters.

MirC/MirX Users: This wiring requires two contact closure inputs on the sender board before the receiver's relay activates. Use this approach when two independent outputs must close before turning on the light.

For example, a light could turn on only when:
• A light sensor detects it's dark AND
• A motion sensor detects activity in the room

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Example 4 - AND Logic Using Three Relays

This example expands on the previous AND Logic concept. Here, the light will turn on only when all three relays are energized:

Relay 1 AND Relay 2 AND Relay 3 must be on for power to reach the light.

A single power wire is routed through all three relay contacts. Wiring from the NO (Normally Open) of Relay 1 to the COM (Common) of Relay 2, then from the NO of Relay 2 to the COM of Relay 3, creates a series path that requires every relay to close before the light can activate.

This method can be scaled easily - just continue wiring NO of each relay to the COM of the next relay. Add as many relays as needed to meet your logic or safety requirements.

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Example 5 - Override Function

This example demonstrates the and/or function. The light bulb will be activated if Relay 1 and Relay 2 are energized OR if Relay 3 is energized. This example is great for applications that may require a logical condition of 2 relays plus an override feature. For instance, if Relay 1 is a night/day sensor, Relay 2 is a moisture sensor. If its dark and the soil is dry, Relays 1 and 2 can activate a pump. If you want to override these conditions with local physical switch using Relay Activator function (see the AD8 Command Set Tab) Relay 3 would override Relays 1 & 2.

MirC/MirX Users: Add a manual button or switch to control the third relay to manually control the light if you have sensors that control the other relays.

Reactor Users: Add a manual button or switch to control the third relay to manually control the light if you have sensors that control the other relays.

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Example 6 - Either Relay Activates

This example demonstrates how either relay can be used to activate a light. Only one power wire is switched in this example using either of two relays to turn on the light. In this sample, only one activated relay is required to activate the light. If both relays are activated, the light will be on. Great for if you have a timer for one of the relays but want to turn the light on when the timer is scheduled off or have two sensors connected and want either of them to control a device.

MirC/MirX Users: Two contact closure inputs in the sender board and either of the inputs can control one light or device.

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Example 7 - 3-Way Switch

This example demonstrates how to create a 3-way light switch to activate a light. A 3-way light switch is where two light switches can be used to activate a single light. This sample is exactly the same as a 3-way light switch, the only difference being each physical switch is replaced by a relay. Operationally, it works the same way. Only one power wire is switched in this example using both relays to turn on the light. Each relay activation will cause the light to toggle. Switching two relays at one time is like flipping 2 switches at once....with the same result. This sample is particularly useful since you can replace one relay (as shown in the diagram) with a physical light switch. This will allow a computer to control a light as well as manual operation of a light. Properly used, this can be one of the most valuable diagrams we offer on this page.

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Example 8 - Motor Control

This example demonstrates how to control the direction of a DC motor using 2 relays. Braking is accomplished by connecting both motor terminals to a common power connection (Faraday's Law). The capacitors shown may not be required for small motors, but if you experience problems with relays shutting themselves off, the induction suppression capacitor will be required. The .1uF capacitor helps suppress electronic noise if the battery were to be used by sensitive devices (such as radios/amplifiers).

• Relay 1 Off Relay 2 Off = Motor Brake to +
• Relay 1 On Relay 2 Off = Motor Forward
• Relay 1 Off Relay 2 On = Motor Backward
• Relay 1 On Relay 2 On = Motor Brake to -
• Induction Capacitor Should Be located by relay
• Filter Capacitor Should be Located Near Motor
• Additional Capacitors May be Desirable for Some Motors

Inductive loads typically require 2-3 times the runtime voltage or amperage when power is first applied to the device. For instance, a motor rate at 5 Amps, 125 VAC will often require 10-15 amps just to get the shaft of the motor in motion. Once in motion, the the motor may consume no more than 5 amps. When driving these types of loads, choose a relay that exceeds the initial requirement of the motor. In this case, a 20-30 Amp relay should be used for best relay life.

Base Station Software

Compatible with All Boards on this Site

Base Station software works by communicating with your controller to identify the model and provides the appropriate graphical user interface for controlling and testing the identified device.  Base Station will assist you in learning how any NCD device functions and will provide valuable diagnostic tools to help determine if your controller is functioning as designed. Base Station software exercises every supported feature of every supported device.  It is the ultimate reference tool for learning, diagnosing, and testing NCD devices.

User Interface

You may click one time on any item in the list to see a graphical user interface that was created as the controller was developed.  Each command set represents a module that is installed in the firmware of your device.

Device Identification

A window will open labeled "Device Identification Data".  This window contains important "Read-Only" information about your device.  Note the "Documentation Related to this Controller" field.  This is a compilation of all articles relevant to your device.  Click on an item in the list to view.  You will need an Internet connection to access this information. All devices released in 2012 and later support Device Identification.

Device Command Sets

Base Station software asks the controller which command sets are supported.  The supported command sets are listed when you run the Base Station software application.  Some controllers may show more command sets while other controllers may show fewer command sets.  The Base Station program will decide which command sets apply to your particular controller.  ProXR users can turn relays on or off and perform any function from the entire ProXR Command Set!

Control All ProXR Functions

Control relays, read status of relays, read inputs all from the ProXR boards and perform all functions of the baord. Base Station is a point-and-click software that will also show you the command that is being sent to the board, making Base Station a great tool for programmers!

Useful Features

There are some useful features to look for when using Base Station Software to control, test, or configure your device:

• Links to Quick Start Guides and Documentation
• Discovers Newtork devices and displays IP Address for easy connection
• Control Command Set Window (circled in red), ProXR users can view commands sent to the board

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Relay Activator

Relay Activator and Analog Inputs

The Base Station Relay Activator control panel allows analog inputs to directly control relays!  Simply connect the analog inputs to buttons or switches and trigger basic relay on or off functions to take manual control of the on-board relays.  The Relay Activator control panel allows you to define 8 functions for each of the 8 inputs.  Functions include turning relays on or off, toggling the state of relays, momentarily flash a relay, momentarily toggle the flashing function of a relay, turn all relays on, turn all relays off, and push notification events.  When push notification events are configured, the controller generates a packet of data every time the inputs change state.

Relay Activator for Manual Control

Relay Activator is great for applications where computer control is used but manual control is necessary at times.  Buttons or switches can be used to take manual control of any of the relays.  You will have the ability to turn a relay on with a computer and turn the relay off with the manual switch! Relay Activator is only available in all ProXR Lite versions and ProXR boards with part numbers begining with ZAD. Download the Relay Activator Quick Start Guide here: in the AD8 Relay Activator Quick Start Guide.

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Reactor Users

Reactor Events Settings

All All Reactor configurations are made through Base Station. Base Station allows users to define the activation of a relay or an event based on the voltage readings of the analog inputs. An input can trigger a relay directly or an input can trigger an event, such as a timer. If an input triggers a relay, the relay may turn on. If an input triggers a timer event, a timer may be started, but a relay may or may not be turned on based on how you have configured the controller (the time delay may be before the relay triggers). The Reactor graphical user interface is only provided when Base Station is communicating with a Reactor board, other functions may not be available with this type of board.

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TaraList Users

TaraList Setup

Base Station Software is used to configure and upload the time schedules to the Time Activared Board. TaraList users will be shown the configuration page for setting up the time schedule and uploading the schedule to the board. ProXR usere will not be offered this page and not see it.

Software Options

Not a programmer and think these boards look great, not to worry we have software to help get you connected and even control the relays with a button on your desktop or by a time schedule!

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Data Sheets & Quick Start Guides

Below are the Data Sheets Quick Start Guides for this board.  These are the guides that will help you communicate and configure this board.

Download Mechanical Drawing