Data Sheet

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 may be left at the
default baud rate etc, because they are not actually used - there is a direct USB
connection into the processor.
Commands
The USB-RLY02 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-RLY02 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.
Command
Action
dec hex
90 5A
Get software version - returns 2 bytes, the first
being the Module ID which is 10, followed by the
software version