Command BCcmd :

Send a GPIB command message.
This method is not used to transmit programming instruction to devices
this kind of instructions are transmitted with the read / write methods.
As done in write method, cmd automatically append EOS, as defined with
setEOS method.

BCcmd Definition
Input Argument	Tango::DEV_STRING	Command string.
Output Argument	Tango::DEV_VOID	no argout
DisplayLevel	EXPERT	..
Inherited	false	..
Abstract	false	..
Polling Period	Not polled	..
Command allowed for	All states	..