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After googling a large portion of my day away, I found I am stuck I have purchased a rs485 usb dongle “USB to RS485 Converter Adapter ch340” to be exact With a r421a08 Relay board. I can turn relays on and off using a python test script. (https://github.com/Erriez/R421A08-rs485-8ch-relay-board) I would like to be able to send commands using autoit. I have tried to use putty and send commands, but I have no idea how to do so. If some one can give an example on how to turn on and off a relay, I would be much obliged.