The MirCR85 Wireless Contact Closure Relays are a set of two boards, a sender board and a receiver board. The Contact closure inputs
on the sender board triggers the relays on the receiver board - wirelessly. Connect
the contact closure on the sender board and a relay will trigger on the receiver board - it's just that simple!
Contact closure inputs such as buttons, relays, switches or other electronic devices (no voltage) attached to inputs on
the sender boards will trigger the relays on the receiver board.
8 5-Amp Relay Installed
- Single Pole Double Throw (SPDT) Relay
- Temperature Rating -40° C to 85° C
Sender Board Controls Receiver Board
- 8 Contact Closure Input on Sender Board
- 8 5-Amp Relay on Receiver Board
- Sold in Pairs
- Line of Sight Operation
- 300' Standard Range
- 1-Mile & 900 MHz Options
- Multiple Pairs will not Interfere with Each Other
Works Together Right Out of the Box!
- No Computer, No Programming, No Set-Up!
MirC boards operate reliably and efficiently when the antennas can “see“ each other. Obstructions like walls, buildings and even trees and hills can diminish the signal or prevent communication altogether. Metal being the worst for any wireless signal to penetrate with stone and brick and being a close second. Positioning the antennas for line-of-site operation will greatly increase reliability.
Wireless Contact Closure
MIRCR85 are sold in pairs, you will receive both boards shown here when you purchase this set. These boards will give you the opportunity to control a relay wirelessly using a simple dry contact. Wireless applications include gate controls, door lock control and anywhere you need to transfer a contact closure to another location wirelessly. Pricing shown on our web site indicates pricing for the pair of boards.
Each board is equipped with a Wireless Module. The wireless module adds wireless communications to the board and is paired using the serial numbers of the radios installed. The module is powered from the board and the board itself will require 12 volts of power and can be hard wired or you can purchase a "wall wart" type Power Supply at checkout.
You have your choice of three modules that can be installed on the boards. The modules installed will affect the range or distance the boards will be able to effectively communicate with each other. The default option is the "Standard Range", which operates up to 300 feet (91 m) and includes a small integrated antenna that cannot be moved or positioned. The 1-mile (1.6 km) and 2-mile (3.2 km) modules have an external whip antenna which will be needed if installing the boards in an enclosure or if positioning the antenna is necessary for line of site operation. Hills, Trees, and Buildings will greatly reduce communication range of all wireless devices as will indoor use, so practical distances may be less.
An extension cable can be used on the 1-mile & 2-Mile antennas to position the antenna if needed. The cable should be no longer than 20' (6 m) to prevent signal loss. The antenna uses an RP-SMA connection or Reverse Polarity SMA connector.
The wireless modules installed use an 802.15.4 topologies, XBee RF modules are ideal for applications requiring low latency and predictable communication timing providing quick, robust communication in point-to-point configurations. The 300' and 1-mile range modules operate at 2.4 GHz frequency band. The 2-mile option operates at 902 MHz to 928 MHz and it's longer wave length makes it ideal for indoor applications for penetrating walls and partitions.
As with any wireless technologies, for optimal performance it needs to be line-of-sight. We can't stress this enough. In other words the antennas of the boards must "see" each other to get the optimal range or even be able to communicate at all. Obstructions like walls, buildings and even trees and hills can diminish the signal or prevent communication altogether. Metal being the worst for any wireless signal to penetrate with stone, brick and hills being a close second. Upgrading to a longer distance module will not mean that the signal will be able to penetrate these obstructions even at a short distance of a few feet.
What Happens When Communication is Lost
A common question we receive is what happens to the relay that is energized and communication between the boards is lost. The relay can remain energized or on until communication is re-established or the relay can de-energize or turn off. This is done by a simple jumper on the board and setting it to Beacon or Smart mode. Regardless of the Mode you choose, if the busy LED flashes, the two devices are communicating properly. If the Busy LED does not flash at all, the devices are unable to communicate.
Multiple MirC Pairs?
Multiple pairs of the MirC Controllers can be used within range of each other. The boards are paired together using the serial numbers of the wireless modules installed, meaning multiple pairs will not interfere with each other!
Attention: No Voltage Input
Please Note: Users must NEVER apply any voltage to an input on the MirC Sender Board, these inputs are for Dry Contact Connections ONLY.
This pair of boards allows you to control a relay using a dry contact (no voltage). The dry contact can come from a manual switch, a sensor or device that provides a contact closure, or another relay. As long as the contact closure circuit is closed the relay will remain energized or on. When the circuit opens the relay will de-energize or turn off. Meaning the relay will respond to a toggle or momentary connection depending on what type of input you select. Each MirC pair is ready to stand up to rigorous demands from heat, cold or vibration. Take it from us, these controllers will hold up!
Status of Remote Relays
Both boards are equipped with LEDs that display the status of the relay on the receiver board. Status information is verified using 2-way wireless communications. If communication is lost between the devices, the LED will turn off. Additionally, every MirC controller is equipped with a Busy/Ready LED. If the Busy LED flashes, this indicates the other device has successfully received and accepted your contact closure status. If the Busy LED does not flash, the remote device is out of range.
What Happens When Communication is Lost
A common question we receive is what happens to the relay that is energized when communications between the boards is lost. The relay can remain energized or on until communication is re-established or the relay can de-energize or turn off. This is done by a simple jumper on the board and setting it to Beacon or Smart mode. Regardless of the Mode you choose, if the busy LED flashes, the two devices are communicating properly. If the Busy LED does not flash at all, the devices are unable to communicate. See the table below for the differences between Beacon and Smart mode.
Contact Closure Inputs
The inputs on these boards accept a dry contact only - no voltage. Users must never apply any voltage to an input on either of the MirX Controllers.
Relays do NOT provide a voltage output and can be used as a dry contact. They provide a contact closure output and simply interrupt the power to the device you are switching. The relays are rated for 240 VAC or 24 VDC. See the Data Sheets tab above for the specs on relays installed.
SPDT Relay Installed
This device has SPDT relays installed. SPDT Single Pole Double Throw Relays have three connections - Common, Normally Open, and Normally Closed. When the relay is off, the common is connected to the normally closed connection of the relay. When the relay coil is energized, the Common swings over to the Normally Open Connection of the Relay. You can wire the device you are switching to either the Normally Open or the Normally Closed position.
MirC 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.
Break-A-Way Tabs for a Smaller Design
The MirC relays have a great feature where space is a premium - Break-A-Way Tabs. The Break-A-Way Tabs allow most boards to fit in an optional undrilled plastic enclosure. Snap off the Break-A-Way Tabs and you have a controller with a smaller profile when you need to fit in a tight space.
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
MirC 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.
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 firstname.lastname@example.org.
Contact Closure Relay 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
Single Pole Double Throw Relays Installed
- Wire to Normally Open or Normally Closed Position
Break-A-Way Tabs Lets you Decide the Board's Size
Screw Terminal Contact Closure/Relay Connections
Control Relay from a Dry Contact
Inputs on Sender Board Control Relays on Receiver Board
Sender Board Displays Status of Remote Relays
No Computers, No Programming, No Configuration
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 controller requires the use of induction suppression capacitors. 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 electrically interferes with the microprocessor logic of our controllers, causing relay banks to shut themselves down unexpectedly. In the case of Ethernet devices, customers may experience loss of communications until the device is reconnected. Capacitors that we offer are available at checkout, for more information view our Induction Suppression Video.
Power Supply Available
Reliable Power Means Reliable Switching
The PWR12 is regulated power supply providing clean power necessary for
the performance of these boards. 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 R/A barrel connector.
The SR171B Enclosure is an undrilled, non-waterproof enclosure and is available at checkout. The SR171B enclosure fits both sender and receiver board.
an inductive load using our relay controllers requires the use of induction suppression capacitors. 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 electrically interferes with the microprocessor
logic of our controllers, causing relay banks to shut themselves down unexpectedly.
Simple Push Button
Push-On Push-Off Alternate Action Switch or Push-On Momentary Switch are available at checkout. Great for bench testing!
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.