Yokogawa Standalone MW100 - Manual (Page 121)

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MW100 uses only the bit 0 (Online), bit 1 (Restarted) and bit 5 (Over-Range), and
other bits will be kept un-asserted (i.e. zero). Behavior of flag in MW100 is shown in
Table 65.
Table 65. Behavior of flag in MW 100
1. When slave/server has restarted or connection has initialized,
Restart bit will be asserted.
2. When the value of measurement/computation channel became
+Over, -Over or Valid, Online bit will be asserted.
3. When the value of measurement/computation channel became
+Over, -Over, Over-Range bit will be asserted.
4. When the communication input channel has the value except
for NaN, Online bit will be asserted.
5. When the communication input channel has the value of +INF
or -INF, Over-Range bit will be asserted.