The USB-RLY82 USB controlled relay board provides 2 voltage-free contact relay outputs with a current rating of up to 16A each. Powered and controlled from the USB bus, this board features premium ultra low power 50mW coils.
This Devantech USB-RLY82 2 channel relay board provides 2 voltage-free contact relay outputs, each with a current rating of up to 16A. The board is powered and controlled from the USB bus. It features premium ultra low power 50mW coils, which offer efficient energy usage and low maximum current consumption. This RoHS-compliant product is manufactured in the United Kingdom by Devantech.
The USB-RLY82 provides two volt free contact relay outputs with a current rating of up to 1Amp each. It is powered from any standard USB bus and has an exceptionally low maximum current consumption of approx. 90mA with all relays on. The relays are SPCO (Single Pole Change Over) types. The normally open, normally closed and common pins are all available on the screw terminals. Eight inputs can either be used for analogue or digital requirements, the 10bit ADC (0-1023 result) can be configured to scale to the 5V USB supply, 4.096V or 2.048V references.
Board Dimensions
LED indication
The USB-RLY82 provides a red LED mounted immediately next to each relay to indicate whether it is in a powered state (LED on). There are also two LED's next to the USB connector, the first is red to indicate the module is powered (USB supplied) and there is also a green LED to indicate reception of data from the USB.
Relay power rating
If the contact load voltage and current of the relay are in the region enclosed by the solid and dotted lines in the figure below, the relay can perform stable switching operation. If the relay is used at a voltage or current exceeding this region, the life of the contacts may be significantly shortened.
- Surge withstand voltage up to 2500VAC, meets FCC Part 68 and Telecordia
- Meets EN60950 / EN41003
- SMT and DIP types available
- Bifurcated contacts
- Single side stable and latching type available
- Environmental friendly product (RoHS compliant)
- Outline Dimensions: (15.0 x 7.5 x 9.0) mm
First Step - Get The Drivers
Before connecting the USB-RLY82 module, you should download the driver and unzip it to a temporary folder. Now connect the USB-RLY82 module and navigate windows to the temporary folder and install the driver. The USB-RLY82 will now appear as a COM port.
Which COM port?
After installing the drivers, and plugging in the USB-RLY82 module to a spare USB port, you will want to know which COM port it has been assigned to. This will vary from system to system depending on how many COM ports you currently have installed. To find out where it is, right click on your "My Computer" desktop icon and select the "Device Manager" tab. Now scroll down and open the "Ports (COM & LPT)" tab. You should see the USB serial port listed - COM2 in the example below. If you want to change the COM port number - just right click on it, select properties, select advanced and select the COM port number from the available list. The COM port default will probably be set up for 9600 baud, 8 data bits, no parity and one stop bits, but what ever it is just ignore it. These settings are not actually used because we have a full 12Mbits USB connection right into the heart of the processor.
Commands
The USB-RLY82 operates with an easy to use command set as described in the table below.
| Characteristics | ||
| Relays | 2 | |
| Analog/Digital Inputs | 8 | |
| Power | Powered from standard USB bus | |
| Control Interface | USB | |
| Relay Current | Up to 1A @ 30VDC or 60VAC, 500mA @ 110VAC, 250mA @ 250VAC | |
| Connections | Screw Terminals for N/O N/C and common contacts | |