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Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
Operating Instructions, 08/2017, A5E37367739-AC
303
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[unit]
(unit register)
Value range /
Setting options
Access
level
3416
Float / 4
Travel time
down path 1
Travel time of down-
stream signal
-
-
Read
only
3418
Float / 4
Correlation
factor path 1
Correlation factor
-
-
Read
only
3424
Unsigned / 2 Accepted burst
percentage
path 1
% of bursts accepted
(path 1).
Based on various di-
agnostic input (i.e.
correlation strength,
gain level, SNR, etc.)
the meter may reject
specific up/down re-
ceived sets or bursts.
The percentage of
accepted bursts is one
measure of the appli-
cation’s health.
-
-
Read
only
3425
Float / 4
Actual sensor
frequency path
1
Sensor frequency
-
-
Read
only
3429
Float / 4
Upstream peak
amplitude path
1
Upstream signal peak
amplitude
-
-
Read
only
3427
Float / 4
Downstream
peak amplitude
path 1
Downstream signal
peak amplitude
-
-
Read
only
3431
Float / 4
Fluid refraction
angle path 1
Calculated fluid refrac-
tion angle on path 1
(clamp-on only).
-
-
Read
only
Table A- 97 Path 2 diagnostics
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[unit]
(unit register)
Value range /
Setting options
Access
level
3450
Float / 4
RxGain up path
2
Rx gain of upstream
signal
-
-
Read
only
3452
Float / 4
RxGain down
path 2
Rx gain of downstream
signal
-
-
Read
only
3454
Float / 4
SNR upstream
path 2
Signal to noise ration
of upstream signal
-
-
Read
only
3456
Float / 4
SNR down-
stream path 2
Signal to noise ration
of downstream signal
-
-
Read
only
3458
Float / 4
Sound velocity
path 2
Sound velocity
-
-
Read
only
3460
Float / 4
Flow velocity
path 2
Flow velocity
-
-
Read
only