PARAMETER_DESCRIPTION is very limited. It lets you describe simple PIDs with a single value that is symmetric between GET and SET. Anything more complicated can't be fully described.
sergeychk> Accordingly the controller must use the same value for Get/Set reqest
The length applies to the SET request sent by the controller and to the GET_RESPONSE sent by the responder.
sergeychk> Get command controller must send one dummy byte. Is it correct?
No, the GET request would have a PDL of zero.
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