Technical Documentation

USB-RLY16 - 8 relay outputs at 16A
Technical Documentation
Overview
The USB-RLY16 provides eight volt free contact relay outputs with a current rating of up
to 16Amp each. The processor is powered and instructed from any standard USB bus and
the relay power is obtained by the DC power input adaptor. The DC input jack is 2.1mm
with positive core polarity, DC supplies are required to supply at least 500mA at 12vdc.
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-RLY16 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
near 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.

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