Gen3 Ethernet Relay

"The Gen3 module delivers stable TCP/IP communication"

Easy Ethernet Configuration

Connecting the Taralist to your network is fast and flexible. Build your time schedule in Base Station, then upload it from any computer on the same network.
Once your schedule is stored in memory, the Taralist takes over and runs completely on its own - no PC required.

If you leave the board connected to the network, you can log in anytime to trigger relays, check status, or update schedules in seconds.
Prefer stand-alone operation? Just disconnect it after uploading your schedule.

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Once Configured

After your schedule is uploaded, the Taralist checks every second for event matches. When it finds one - day, time, and event conditions aligned - it fires the programmed action instantly. Everything runs from the board's onboard memory for reliable stand-alone operation.

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Ethernet to Serial Communications Module

The Taralist Ethernet versions use the NCD5500 Ethernet-to-Serial module - our latest and most reliable network interface. It's designed specifically for NCD devices to deliver:

• Ultra-stable network communications
• Fast configuration through a browser or Windows app
• Easy static IP setup
• Improved recovery options and firmware updates

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DHCP and Static IP Addresses

The NCD5500 supports both automatic (DHCP) and manual (Static) IP assignment.

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TCP/IP Communications

Communication with the board is handled through a standard TCP socket. This provides a direct, reliable, point-to-point path for Base Station and custom software to upload schedules, take manual control, and read relay status.
TCP/IP keeps everything fast, consistent, and easy to integrate into an existing network.

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3rd Generation Hardware

This 3rd-generation module delivers major improvements in:

• Stability and reliability
• Ease of configuration
• Network recovery (including finding modules with unknown IPs)
• Cost-effectiveness

Users can also update the module's firmware as new features become available, ensuring your device stays current.

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Take Manual Control of Taralist

As long as the board remains on the network, any authorized PC can:

• Activate or deactivate relays
• Edit schedules
• Monitor relay status
• Override the Taralist logic temporarily

When a PC takes control, the Taralist's schedule logic pauses for that relay. When the PC releases control, the board returns to autonomous operation.

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Controlling Relays

There are two ways to control relays on a Taralist controller:

• Time Scheduled Control: Relays activate based on your programmed event list.
• Manual Network Control: Any PC on the network can trigger relays or take control when needed. Just remember to return control to the Taralist logic for stand-alone operation.

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Password Protection

Password protection is built in.
Under the management tab, users can assign a password for added security and access control.

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Who's Qualified to Use the Taralist Series?

No programming required - just basic computer and networking familiarity. Base Station offers a point-and-click interface for building schedules, testing relays, and modifying settings. More complex event setups may require patience and careful planning, but the workflow remains user-friendly and logical.

Base Station Taralist Setup

"Run relays automatically based on your schedule"

Base Station Software

Base Station software works by communicating with your controller to identify the model and provides the appropriate graphical user interface for setting the time schedule and uploading it to the board.  Base Station Software is used to configure and upload the time schedules to the Board and take manual control of the board to override the time schedule.
Download Base Station

Integrated Real Time Clock

The Taralist series have an integrated battery backed Real Time Clock with memory that allows users to control relays based on a time schedule.  Use your computer to setup the time schedule and store your schedule into the board.  Once stored, the Taralist does not require a computer, and will control the relay according to a schedule that can be as simple or as complex as your application requires.

Time Schedule Events

Events are scheduled times when a relay or group of relays are turned on or off.  They are defined by the user first by time: Year, Month, Day of Month, Day of week, Hour, Minute, and Second. You have the ability of switching relays on or off at very specific times!  Activate relays only when the day is Monday, activate relays when the day is Monday and the Year is 2020, activate relays when the day is Monday, the year is 2020 at 9:44:21 AM.  They are also defined by how they control the relays, whether they turn a relay or group of relays on or off. You can add up to 1000 Events to the list.

Program Multiple Schedules

Override functions are also supported.  So if the normal schedule activates a light during weekdays, but you don't want the light to come on during holidays, simply program your holiday schedule to prevent the light from activating according to your normal schedule.

Daylight Savings Time is also supported, and is FULLY CUSTOMIZEABLE.  As we all know, DST laws change periodically, but the Taralist series allow you to change the year and date of all DST events (we have programmed the US dates until 2030).

Save You Schedules

Taralist controllers allow you to build and save your time schedule as a file on your computer.  Different schedules can be configured for different times of the year, for instance one for Summer School and one for the full school year.  Upload the schedule you need for that part of the year.  For users with multiple boards saved schedules can also be used to store the time schedule into each controller easily without re configuring.

Clock Accuracy - Adjustable Time Compensation

Like most clocks, time drift is a reality and the Taralist controller will drift over time.  The Taralist clock has some special features to help keep the time accurate.  Time compensation functions are included that allow you to automatically adjust the clock forward or back (by up to 15 seconds) each day of the week.  For instance, you may find the Taralist keeps better time if it automatically advances the clock 1 second each day of the week.  Or you may find that you need to subtract 5 seconds from the clock 1 day per week.  Adjustable time compensation will help keep your clock accurate (though it is always a good idea to check on the clock periodically).

If your application requires your relay control to match a computer's time exactly we recommend using a computer controlled Relay and Relay Timer Software.  The software can be installed on a computer or server and match the time exactly.  We recommend this for school bells and shift change applications where matching a time clock is vital.  Select a Wired or Wireless Relay under Relay Control from the top menu to select a board then add the Relay Timer Software at checkout.

Manual Control

TaraList boards have some amazing abilities when it comes to making decisions on their own based on the events you configure, but you can take control of the relays at any time from a computer as long as communications are established between your computer and the Time Relay device.

The interface elements shown at right allow a computer to take over control of any relay and force the relays to a On or Off state.  You may also turn all relays on or off using the all relays on and all relays off buttons.  You can also read the status of relays by clicking the Read Relay 1-8 Status.  The Status of the relay will be shown to the right of the button.  The slider at the top of the screen allows you to select with bank of relays these commands are directed to. 

Power Loss Backup Buffer

The Midnight Backup Buffer is a special feature developed to help keep track of which relays should be activated in the event power is lost.  Every night at midnight, the current status of all relays is stored in non-volatile memory.  If power is lost, the Taralist will load the status of the relays from memory.  Next, the Taralist will calculate all events from midnight to the current time to determine if any relays need to be activated or deactivated.  Finally, the Taralist will refresh all relays and will be ready for normal operation.

Taralist Board Features

"Engineered for Reliability. Built to Scale."

Time Activated Relay Controllers (Taralist Series)

Taralist Time Activated Relay Controllers make scheduling easy. Each board includes an integrated real-time clock, so your relays can follow a precise schedule - day, hour, minute, second - without needing a computer connected 24/7.
Once you create your schedule in Base Station Software and upload it to the board, you're done. The controller handles the rest automatically.

These boards are ideal for lighting control, security systems, HVAC, bells, timed access, automation sequences, and any project that needs relays triggered on a repeating schedule.

But! Keep this in mind:

• The onboard clock can drift over time. Most users won't notice, but if your application requires precise long-term accuracy (bells, synchronized events, access timing, etc.), this may not be ideal.
• You can correct drift manually, but it takes periodic maintenance.
• If you need perfect time accuracy, consider using Relay Timer Software with a ProXR board, which uses your PC-s system time.

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Add Relays as Your System Grows

Every Taralist controller includes an onboard XR Expansion Port, allowing you to add relay expansion boards at any time.

Start with the number of relays you need today and expand incrementally - up to 256 total relays - without replacing your controller or rewriting your software.

Expansion boards share the same schedule structure and can mix relay types and amperages to match evolving system requirements.

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SPDT Relay Installed

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 of wiring methods can be found in the gray Relay Logic tab.

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2 Million+ Cycles

ProXR relays are rated for long service life - expect years of dependable operation and millions of mechanical cycles.
Every controller includes a 5-Year Warranty and 30-Day Money-Back Guarantee.

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Essential Power Requirements

Clean, regulated power is critical.
A stable 12VDC supply ensures both the relay coils and onboard firmware operate correctly. Unstable or noisy power can cause improper switching or communication issues.

We recommend the PWR12-US (120VAC → 12VDC @ 1.25A) or our international supply with interchangeable adapters.
Learn More

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Break-A-Way Tabs for a Smaller Design

Need a smaller footprint? The Taralist PCB includes Break-A-Way Tabs, allowing the board to fit into optional undrilled enclosures or tight-space installations.

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RoHS Compliant & Lead-Free

All ProXR Lite controllers are built with RoHS-compliant components and lead-free solder.

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Shipping

All boards ship directly from our Missouri facility. Each unit is built and tested at the time of order - please allow 3 - 5 days for production. We ship primarily through UPS, but we're happy to use FedEx or DHL for international orders when you provide your account number. Questions? Call us at 800-960-4287 or email sales@relaypros.com.

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Induction Suppression

One of the most important parts of relay control - yet the most commonly overlooked - is inductive load protection.

Anything with a magnetic coil (motors, solenoids, transformers, etc.) generates high-voltage "kickback" when switched. Without a suppression capacitor, that spike can:

• Shorten relay lifespan
• Cause electrical noise that disrupts the microcontroller
• Trigger unexpected shutdowns
• Require power cycling to restore communication

Adding an induction suppression capacitor protects your relay contacts and keeps everything running smoothly. Capacitors are available at checkout, and our Induction Suppression Page has wiring diagrams and more details.

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Time Activated Relay Is Here!

Control relays with a time schedule and configure with Base Station software a free download.  Here's a lists of great features:

User Friendly Software
• Point & Click Interface - No Programming Knowledge Required
• Override Time Schedule When Computer is Connected to Board
• Read Status of Relays in Base Station

User Friendly Board Design
• Break-A-Way Tabs lets you decide the board's size
• Screw terminal or direct relay connections make connecting to the relays easy

The XR Expansion Port

"Running out of relays? Just plug in more!"

Add Relays as Your Needs Grow

ProXR Controllers were built with relay expansion in mind. The XR Expansion Port lets you add banks of external relays to any ProXR or Taralist board equipped with an XR Expansion port. Expansion boards can be added at any time as your system grows, up to a maximum of 256 total relays.

As expansion boards are added, additional relay banks become available automatically. Simply add another expansion board whenever you need more relays.

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Relay Banks - How Large Systems Stay Simple

ProXR and ProXR Lite controllers organize relays into groups of eight called banks.

Each bank contains:

• Relay 1 through Relay 8

Expandable ProXR boards can add additional banks using XR expansion boards as your system grows.

For example:

• An 8-relay controller uses one bank
• A 32-relay controller uses four banks
• A 64-relay setup uses eight banks

Instead of creating a different command for every relay in a large system, the ProXR firmware lets you:

• Select a bank
• Send simple relay commands within that bank

This keeps the command structure fast, compact, and easy to manage - from a single-bank ProXR Lite installation to large, multi-bank ProXR expansion systems. From a single 8-relay board to a fully expanded 256-relay system, the command structure does not change.

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Linking XR Expansion Boards Together

XR Expansion Boards include both an XR Input and XR Output connector. Connect the XR Output on your ProXR controller to the XR Input on the first expansion board. To add more relays, connect the XR Output of one expansion board to the XR Input of the next board in the chain.

You can mix and match different relay types on expansion boards to match your application. A 6" expansion cable is included with each expansion board.

For best reliability, keep all expansion cabling as short as possible. Maximum expansion length and total relay count depend on your installation, electrical noise, and overall cable length. For best compatibility, the combined length of the controller, expansion boards, and cables should not exceed 1-2 meters.

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Mix & Match

Expansion boards do not need to match the relay type or amperage of the main controller or other expansion boards. Mix and match expansion boards to get the exact relay types and current ratings your application requires.

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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.

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Essential Power Requirements

All XR expansion boards require their own 12 VDC power source. A regulated 12 VDC supply must be connected directly to each expansion board for proper operation.

We offer a compatible wall-plug power supply at checkout, or you may use your own regulated 12 VDC supply. Learn More

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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.

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RoHS Compliant

Expansion boards are led free and RoHS Compliant.  If your requirements are for RoHS compliant parts every expansion board is manufactured with RoHS compliant led free parts and solder.

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2-Million Cycles

XR Expansion Boards are designed for long life just as the ProXR boards, you should expect to get years of service from expansion board and literally 2-million cycles from the relays on board.  With a 5-year warranty and a money back guarantee add more relays anytime the need arises!

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Power & More

"Reliable Power = Reliable Switching"

20/30 Amp Board Performance Ratings

This tab brings together the essential performance ratings you'll want to know for NCD 20/30 Amp Relay Controllers and their supported communication modules. You'll find practical electrical requirements, power consumption estimates, operating limits, relay timing details, and more-all based on typical 12VDC operation at 70°F (21°C). Think of it as a reliable snapshot of how our hardware behaves under real-world conditions. Because every installation is unique, some values are estimates and may evolve as designs and testing continue. Use this information as a planning tool to help you choose the right controller, build an accurate power budget, and understand the capabilities built into every NCD 20/30 Amp relay board.

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Powering from a Battery or Solar Panel?

NCD relay controllers are well-suited for battery-powered and solar-charged applications when operated within the recommended 10 - 15VDC range. This makes them ideal for remote, mobile, and off-grid installations using common 12V battery systems with solar charging. The power consumption data on this page helps you estimate runtime, size your battery, and avoid over-discharge. Staying within the voltage limits ensures stable, reliable operation in long-term battery and solar-powered setups.

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SPDT Relay Specs

Specs of NCD SPDT Relay Boards	Minimum	Nominal	Maximum	Notes
Operational Voltages	10VDC	12VDC	15VDC
Standby Power Consumption	35mA	100mA	200mA	No Active Relays, No Com Module
Relay Power Consumption	28mA	35mA	60mA	Consumption of Each Activated Relay
Operational Temperature Range	-40°F (-40°C)	70°F (21°C)	185°F (85°C)	Theoretical Component Limits Shown
Storage Temperature Range	-67°F (-55°C)	70°F (21°C)	185°F (85°C)	Theoretical Component Limits Shown
Operational Ambient Air Humidity	0%	50%	70%	Non-Condensing Humidity Values Shown
Relay Activation Time			15ms	Needs Further Validation
Relay Deactivation Time			10mS	Needs Further Validation
Operational Life Mechanical	10,000,000			Component Operation Rating
Operational Life Electrical	100,000			Component Rating at Maximum Load

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Communication Modules

Communication Module Specifications

This table provides a quick, clear overview of all NCD Communication Modules. While each module operates at 3.3VDC, the values shown here reflect the impact on a 12VDC master controller at 70°F (21°C). Use the maximum ratings for power-budget planning - they represent short-term peak consumption and may include estimated values that are updated as modules evolve.

Communication Module Power Consumption

Specs of NCD Communication Modules	Minimum	Nominal	Maximum	Notes
Operational Temperature Range	-40°F (-40°C)	70°F (21°C)	185°F (85°C)	Theoretical Component Limits Shown
Storage Temperature Range	-67°F (-55°C)	70°F (21°C)	185°F (85°C)	Theoretical Component Limits Shown
Operational Ambient Air Humidity	0%	50%	70%	Non-Condensing Humidity Values Shown
USB Module Power Consumption	N/A	N/A	N/A	USB Modules are Powered by the USB Port Do Not Consume Device Current
RS-232 Module Power Consumption		10mA	20mA
Ethernet Module Power Consumption	58mA	82mA	100mA
WiFi Bluetooth USB Module Power Consumption	37mA	50mA	100mA	Up to 300 Foot Indoor Wireless Range, Unobstructed. Up to 50 Foot Range Through Walls
900MHz Wireless Module Power Consumption	13mA	30mA	50mA	Up to 1,000 Foot Indoor Wireless Range, up to 2 Mile Outdoor Wireless Range using Included Antennas. Up to 28 Miles Outdoor Wireless Range using High-Gain Antennas.
KFX Wireless Key Fob	11mA	15mA	25mA	Up to 200 Feet Outdoor Wireless Range using 1, 2, 3, 4, or 5 Button Key Fobs. Up to 700 Feet Outdoor Wireless Range using 8-Button Remotes

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A/D Inputs

AD8 Analog Input Usage Notice

Analog inputs should never have voltage applied when the controller is powered down. If your application requires voltage to remain on an input, add a 220-ohm current-limiting resistor to each channel to protect the controller from damage. Keep all analog inputs within the 0 - 5VDC range - exceeding this limit can permanently damage the on-board CPU. Most inputs include a 10K pull-up or pull-down resistor to keep the line stable when unused, but note that this resistor may introduce a slight bias in readings for certain sensors.

Accessories

Relay Logic

"Using a light as an example load, let's wire to the board"

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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Relay Types

SPDT Relay

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. The SPDT relays offered on this site are 5-Amp, 10-Amp and 20-Amp models.

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SPST Relay

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 SPDT 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 Relay

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. We offer the DPDT relays in 1-Amp, 3-Amp and 5-Amp models on ProXR boards starting at 8 relays.

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Relay Logic Examples

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 light 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 energize 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 - AND/OR Logic with Override

This example demonstrates a combined AND/OR logic setup. The light will turn on when:

• Relay 1 AND Relay 2 are both energized
  OR
Relay 3 is energized (override)

This wiring is useful when you need a normal logic condition plus a manual or automatic override option.

For example:
• Relay 1 = night/day sensor
• Relay 2 = motion sensor
• Relay 3 = manual override (local switch)

If it's dark and the motion sensor activates, Relays 1 and 2 energize to turn on the light. But if you want to control the light manually - regardless of sensor conditions - Relay 3 can override the logic and activate the light on its own.

A/D Board Users: The Relay Activator function on any A/D board or ProXR Lite board lets you connect a button or switch to any A/D input. This input can then control the override relay, giving you a convenient local button to manually override the first two relays.

MirC/MirX Users: Add a manual button or switch to trigger the third relay when you need direct control instead of sensor-driven control.

Reactor Users: A local button or switch can be wired to the third relay input to provide a manual override for sensor-based logic.

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Example 6 - OR Logic (Either Relay Activates)

This example demonstrates OR Logic - the light will turn on when either relay is energized. Only one power wire is switched, but it can pass through Relay 1 or Relay 2 to reach the light.

• If Relay 1 activates, the light turns on
• If Relay 2 activates, the light turns on
• If both activate, the light remains on

This setup is ideal when two independent sources should be able to control the same device. Common uses include:

• A timer controlling one relay, with a manual or secondary control for the other.
• Two sensors where either condition (motion detected or low light, for example) should activate the light.

A/D Board Users: The Relay Activator function on any A/D board or ProXR Lite board lets you connect a button or switch to any A/D input. This input can then be used as a manual control of the relay.

MirC/MirX Users: Wire two contact closure inputs into the sender board - either input can trigger the receiver relay to control the light.

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Example 7 - 3-Way Switch (Relay-Based 3-Way Control)

This example shows how to create a 3-way light switch setup using relays. A traditional 3-way circuit allows two switches to control the same light from different locations. In this wiring sample, each physical switch is replaced by a relay - but the operation is the same.

Only one power wire is switched, and the relays toggle the light depending on their current state.

• Activating either relay will toggle the light
• Activating both relays at the same time has the same effect as flipping both switches at once

This wiring method is especially useful because you can replace one of the relays with a physical light switch, giving you both computer control and manual control of the same light. When used correctly, this becomes one of the most flexible and powerful diagrams on the page.

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Example 8 - DC Motor Direction Control

This example demonstrates how to control the direction of a DC motor using two relays. By changing how the motor's leads connect to power, you can run the motor forward, reverse, or place it in a brake state. Braking is achieved by tying both motor terminals to the same power connection, which stops rotation through Faraday's Law.

Relay Operation Summary

• Relay 1 Off / Relay 2 Off → Motor Brake to +
• Relay 1 On / Relay 2 Off → Motor Forward
• Relay 1 Off / Relay 2 On → Motor Reverse
• Relay 1 On / Relay 2 On → Motor Brake to -

The capacitors shown are optional for small motors, but may be required in some situations:

• The induction suppression capacitor prevents the relay from shutting off due to motor back-EMF
• The 0.1µF filter capacitor reduces electrical noise, especially useful when powering sensitive electronics such as radios or amplifiers.

Capacitor Placement
• Place the induction suppression capacitor near the relays
• Place the filter capacitor near the motor
• Additional capacitors may be needed for certain motors

Important Note on Inductive Loads
Motors draw significantly more current at startup than during continuous operation - often 2-3 times their rated running current. For example, a motor rated at 5A (125VAC) may require 10-15A to begin turning. Always select a relay that exceeds the motor's initial inrush current, not just its running current. In this case, a 20-30A relay provides optimal performance and longevity.

Data Sheets & Quick Start Guides