Manual

4-4 SECS Message Detail
4.5 S1F3 - Selected Status Request
S1F3 W * H-> E
<L
<U4 VID> * Variable ID
...
>.
The Host requests status from the GES-1993. The Host sends the VIDs of interest.
Several VIDs can be specified if desired.
Normally, only VIDs of class SV (i.e. Status Variables) are used in this message.
However, the GES-1993 allows the Host to use any VID of class DV, EC, or SV.
If S1F3 contains a zero-length list, then the GES-1993 will report all variables of
class SV, in order by VID.
For compatibility with older Host implementations, the Equipment allows the
following alternative form for this message using an array format:
S1F4 W * H->E
<U4 VID...>.