KROHNE UFC 500 HART - Manual (Page 41)

HARTô Smart Communications Protocol
UFC500 Command Specification Rev: 2.0 Release Date: 9 Jun 2001
© 2001 KROHNE Mefltechnik D-47058 Duisburg Page 41
8.22 Command #156 Read Device-Specific Units And Enumerators
Reads device-specific units and controls.
REQUEST DATA BYTES
NONE
RESPONSE DATA BYTES
#0 #1 #2 #3
PLAUSIB NUMBER NUMBER WEIGHT
ERROR PLAUSIB PLAUSIB POINT
ERRORS ERRORS OK
MSB LSB
#4 #5
PULSE PULSE
VOLUME RATE
UNITS UNITS
#6 #7 #8 #9
REV DISPLAY ERROR DISPLAY
SCALE TOTAL MESSAGE TRANSIT
CONTROL CONTROL CONTROL TIME
CONTROL
Data Byte #0 Error limit in % of measured value for plausibility statement.
Data Byte #1..#2 Limit value for the counter of incorrect measurements.
Data Byte #3 Weight factor for correct measurements.
Data Byte #4 Pulses per volume units, used only for scaling of PulseVolume parameter (refer to Command
#142, Read Frequency/Pulse Output Parameters) and do not affect physical output. For unitsí
codes refer to Table 9.3.
Data Byte #5 Pulse rate units, used only for scaling of PulseRate parameter (refer to Command #142, Read
Frequency/Pulse Output Parameters) and do not affect physical output. For unitsí codes refer
to Table 9.4.
Data Byte #6 Reverse scale control, defines whether the Upper Range Value for reverse flow is the same as
for forward, or different:
0 - Different,
1 - Same as for forward flow.
In the first case the Upper Range Value for reverse flow can be accessed via Command
#158, Read Transmitter Variable Range Values.
Data Byte #7 Display totalizer control, affects the local display of the instrument and the one of the HART
communicator HC275:
0 - "+Totalizer",
1 - "-Totalizer",
2 - "+/-Totalizers",
3 - "Totalizers' sum",
4 - "All totalizers",
5 - "No display".