OPERATION
ST51A/ST75A/ST75AV Mass Flow Meters
54
Fluid Components International LLC
Command 48, Additional Device Status Bytes
below summarizes the Command 48 Additional Device Status bytes. This is a 6-byte field of which only the first 2 bytes (bytes 0
and 1) are used by the instrument. The remaining bytes (2–5) are unused/reserved. A status bit is cleared (0) for no error. A status bit is
set (1) when an error (or condition) is detected.
Table 17 – Command 48, Additional Device Status Bytes Bit Assignments
Byte
Bit
Error/Status Description
Byte 0
0
Flow < Min Flow
1
Flow > Min Flow
2
Unused/Reserved
3
Flow > Customer Max Flow
4
Temperature < Customer Min Temperature
5
Temperature > Customer Max Temperature
6
Unused/Reserved
7
tcDelta_r < dr_min
Byte 1
0
tcDelta_r > dr_max
1
Unused/Reserved
2
Unused/Reserved
3
Unused/Reserved
4
Unused/Reserved
5
Unused/Reserved
6
Unused/Reserved
7
Delta_r > drNamur_max OR Delta_r < drNamur_min
Bytes 2–5
Unused/Reserved
Summary of Contents for ST51A
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