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HGM Busy (if RDM800 attached and showing certain screens)(bit 4)
Comm Fault 1 (communications failed between HGM and adapter)(bit 3)
Comm Fault 2 (internal communications failed within adapter)(bit 2)
Unused (bit 1)
Unused (bit 0)(least significant bit)
Network output variable nvoZoneSampling shows which zone is currently being
sampled by the HGM. It is a number 1-16. Note that if fewer than 16 zones are installed,
nvoZoneSampling will never go larger than the largest zone installed. Also if a zone is
disabled (by setting its tubing length to zero), that zone number will be skipped by
nvoZoneSampling.