> This is a different command. As per the vendor, this is the first command to
> run on port open.

Are you sure it is a control request, not a simple bulk transfer ?

>>>  msg_str = binascii.unhexlify("020200013803")
> Tried it, no difference.

You need to know if you want to send hexadecimal data as ASCII
characters or bytes:
"02" and "\x02" are not the same.

Cheers,
Manu

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