Guess model and byte lenght

[ffries]

From RFC <GETVER>> should allow to guess hardware.

Command:  <GETVER>>
Return:   total 14 bytes ASCII chars from GQ GMC unit. It includes 7 bytes hardware model and 7 bytes firmware version.
	  e.g.:  GMC-300Re 2.10   
Firmware supported:  GMC-280, GMC-300 Re.2.0x, Re.2.10 or later

GMC-500 communicate on 4byte integers, GMC-280, GMC-300 and GMC320 communicate on 2byte.
It should also be possible to send a <GETCPM>> command and measure the lenght of the return, so that there is no need to know the model.

Kind regards,
FFries