RS-232 ProXR Lite Relay with A/D Conversion
Mounts as a Virtual COM Port on your Computer
Control up to 256 Relays and Read 0 to 5 Volt Sensors
Control Through RS-232 of Your Computer or Device
RS-232 Still the Best Choice
While RS-232 is not built into some of today's motherboards, there are many applications where RS-232 is still the best choice. Using a simple USB to Serial Adapter allows you to use RS-232 devices with ease. This combination is actually better than using a device with a onboard USB port,
because it eliminates most of your EMI problems while maintaining compatibility with today's computers.
Connects to Third Party Devices
RS-232 devices are perhaps versatile and most popular choices because of their ability to adapt to any other communication protocol and devices. For instance, using 3rd party devices, RS-232 relay controllers can be controlled from GSM modems, Ethernet to Serial Adapters, WiFi to Serial Adapters, USB to Serial Adapters, Bluetooth to Serial Adapters, and Wireless Mesh Network to Serial Adapters. RS-232 will continue to adapt to all emerging technologies, as the foundation for all communication technologies has provisions for RS-232 communications. With the DB-9 or direct wire capabilities this controller can connect to third party devices almost any way possible.
Integrates with Crestron
This relay can integrate with Crestron, in fact we have many Crestron customers using our devices. The most important thing you need to know is how to format the data out the serial port of the Crestron device. Our devices work with Hex/Decimal byte values. Crestron systems usually work with Hex values, our devices start with a header byte of 254, followed by a command (ProXR controllers need 254, 108, 1 to activate the first relay). So you need to convert all of these values to Hex for the Crestron system and send the bytes out the port. For a detailed list of all the commands with descriptions see our ProXR Enhanced Command Set
Mounts as a COM Port
This ProXR series controller connects through an onboard DB-9 connection or a direct wire connection to your computer and requires a 12VDC Power Supply. This ProXR series controller connects to the serial port of your computer and will mount as a COM port on your PC. Once powered up, the controller waits for a command. A command consists of a few bytes of data in numerical format usually between 2 and 6 bytes. Once the command has been received, the controller processes the command, and sends you back ASCII character code 85 to signal the completion of your command.
This board is equipped with a ZRS Module. The ZRS communications module adds RS-232 communications to the board. The ZRS module is powered from the serial port of your computer. The board itself will require 12 volts of power and can be hard wired or you can purchase a "wall wart" type transformer at checkout.
Three ZRS Modules Available
There are three RS-232 connection options available for this controller.
Wire It Up
Plug It In
Choose Your Connector
Choose the connection that fits your needs. The ZRS-A connection is recommended for applications where hard wiring directly to the board is needed. ZRS-B has the full 9-Pin DB-9 connector on the board. The ZRS-AB Has the DB-9 connector but is is located off the board for applications where the board may be place inside an enclosure an the RS-232 connector needs to reach to the side of the enclosure. You can choose one of these connection options at checkout.
Base Station Software is available at no charge to get you up and running fast (more on Base Station below). Once powered up, the controller waits for a ProXR command. A command consists of a few bytes of data in numerical format (ProXR Enhanced Command Set
) usually between 2 and 6 bytes. Once the command has been received, the controller processes the command, and sends you back ASCII character code 85 to signal the completion of your command. If a command was sent to read the status of the relay the status is sent back.
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 Serial devices, it is not as severe as using a USB port a capacitor is still recommended. Capacitors that we offer are available at checkout, for more information view our Induction Suppression Video
USB Induction Solution
If USB is required, a USB to RS-232 adapter (available at checkout) can be used in combination with the RS-232 controller. The USB to RS-232 adapter will allow RS-232 communications between your USB port and this controller with no complications. The RS-232 communications format with a capacitor effectively blocks induction to safe levels for a USB to RS-232 adapter to function without errors.
Solid State: A Practical Alternative to Mechanical Relays!
Mechanical Relays have a good home in low-cost control applications. But for some users, only solid state switching will do. Solid State Relays are ideal for users who require long term reliability, silent operation, or high induction tolerance. Many inductive control applications require a solid state relay. Inductive loads such as Motors, Valves, Pumps, Solenoids, and Large Transformers (including Fluorescent Lighting) benefit from the use of solid state relays because they reduce the chances of the inductive load interfering with the logic of the relay controller.
Analog to Digital Conversion
Analog Inputs are very special in that they are sensitive to voltage changes. Analog to Digital (A/D) conversion is the process of converting a voltage in the range of 0 to 5VDC into a number that can be processed by custom software that you develop. The ProXR Command Set
will allow you to send a command to the board and read voltage levels from 0-5 volts using 8-bit resolution. 8-Bit resolution will read the voltage input (from 0 to 5VDC) and then is interpreted as a value from 0 to 255. Zero being a contact closure input.
- A voltage input of 0 Volts is interpreted as a value of 0
- A voltage input of 2.5 Volts is interpreted as a value of 127
- A voltage input of 5 Volts is interpreted as a value of 255
So if you divide 5 Volts by 255 possible steps (0-255 for 8-Bit resolution), the board is sensitive to voltage changes as small as 0.019 Volts. This controller has eight A/D inputs, each input is capable of reading a separate voltage from 0 to 5 VDC, provided all voltages can share a common ground. This is particularly useful for reading temperature sensors (one temperature sensor is built into select boards mostly 4 & 8 channel, shared with analog input number 8). A/D Inputs are also useful for reading light level sensors, thermocouples, switch closures, or just about any other kind of sensor you can think of.
A/D Sample Programs Available
Eight Different A/D Sample programs are available in the
. These samples are available as a free download and are compatible with Visual Studio.
N-Button & N-Button Lite is software that allows you to configure buttons to control relays and read the status of those relays without programming. You can also create meters for reading variable input sensors connected to the board in real time! N-Button will allow you to create unlimited widgets and N-Button Lite will allow you to create up to 8 widgets.
When you create custom buttons in N-Button Pro & N-Button Lite you can use any of the commands that are in a ProXR Command Set that is available with this relay. You can find the command set in the ProXR Enhanced Command Summary
. It's quite extensive and you can configure the buttons to activated these commands. 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.
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 the relay on and off. It's up to you and easy to configure with the N-Button Lite software!
Relay Status widgets shows the status of the relay automatically. Just a glance at your desktop will show the status of the relay!
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 and the meters will work with this board!
Save 40% on N-Button Today
Limited time offer! Order the N-Button Lite with a relay board and get it for the unbelievable price of just $29.00. That's a discount of 40% off the retail price! If you purchase the full N-Button Pro it's just $99.00 with the purchase of a relay board and that's a 41% savings off retail price! Desktop control, sensor meters and backgrounds plus all the customization for just one low price, purchase your copy of N-Button today.