0

Used by all instruments for the general version number.

1

Used for any instrument firmware code such as in the PC5.

2

Used for any communications firmware code such as in the PC5

3

Used for any other firmware code, platform-specific.

NOTE: This is deprecated. Used only for firmware older than version 4.15.

4

Used by instruments for the CPU board, PLD version.

5

Used by instruments for the CTRL board, PLD version