Hey All,
This is just an FYI for anyone else who has a Pioneer receiver and wants to control it via RS232.
I have a VSX-23 and found that no matter what I did I couldn't get it to turn on using an Orbiter. Turns out you must first send a <CR> wait 100ms Then issue the on Command.
So I had to change the Power on Code in A/V Properties to
<$"\r\s100m\rPO\r"$>
sleep(5)
Cheers
Slampt