Specifications

ManualsBrandsDevantech ManualsRelay & LED Controllers8-Channel USB Relay Module

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USB-RLY08 Devantech 8 Channel Relay Module

Technical Documentation

Overview

The USB-RLY08 provides eight 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.

LED indication

The USB-RLY08 provides a red LED mounted immediately next to each relay to indicate whether

it is in a powered state (LED on), there is also two LED's which will flash with USB transactions to

and from the module, green indicating reception of data from the PC and yellow the transmission

of data to the PC. Finally there is red power LED mounted on the opposite side of the board to

the USB connector.

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.

Summary of content (4 pages)

PAGE 1
USB-RLY08 Devantech 8 Channel Relay Module Technical Documentation Overview The USB-RLY08 provides eight 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.
PAGE 2
First Step - Get The Drivers The USB-RLY08 module uses the FTDI FT232R USB chip to handle all the USB protocols. The documentation provided by FTDI is very complete, and is not duplicated here. Before using the USB-RLY08, you will need to install FTDI's Virtual COM Port ( VCP ) Drivers. These drivers appear to the system as an extra Com Port ( in addition to any existing hardware Com Ports ).
PAGE 3
Commands The USB-RLY08 operates with an easy to use command set as described in the table below. Most commands are only a single byte and if applicable the USB-RLY08 will automatically send its response. The only exception to this being the "Set relay states" command which requires and additional desired states byte to be sent immediately after the command byte.
PAGE 4
Board dimensions Test program and example source code To get the USB-RLY08 up and running in the minimum amount of time we have put together an example program to demonstrate the functionality of the module. The test program is available as a built exe file here USB RLY08 TEST or as c++ source code here USB RLY08.zip RobotShop Inc.