GPIB errors
-----------

EUnknown
ESel
ERange
ETime
ECtrl
EPass
ENum
EAddr

Routines used and possible errors
---------------------------------

IoEnterS
	ESel
	ETime
	EAddr
IoEoi ?
	ESel
IoEol
	ESel
	ERange
IoGetTerm ?
	ESel
IoMatch
	ESel
IoOutputS
	ESel
	ETime
	EAddr
IoStatus
	ESel
	ERange
IoTimeOut
	ESel
	ERange