One other word of note.
The Orion 565 and Orion II 566 both require hardware handshaking to work
So, ensure that the control program does indeed have a selection to enable
hardware handshaking, namely RTS/CTS.
Without it, I can guarantee you will see the errors you are seeing, and
Also, if you can adjust the polling intervals, set them to 150ms or 200ms
at the least.
We will get it, it is only the cat interface,
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