CiDRA Passive Sonar Transmitters - Manual (Page 15)

3
MODBUS REGISTERS
3.1 Modbus Input Registers
Note: Float values may be set to QNAN if transmitter is not configured to generate those values. (QNAN
means ‘Quiet Not A Number’, a computing term for an IEEE floating point representation for the result of
a numerical operation which cannot return a valid number value.)
Table 4 Modbus Input Registers
Address Size Type Value Description Notes
1 2 Float
Flow Rate as
Displayed
Flow Rate as it appears on the LCD.
Will be set to QNAN when not
displayed.
3 2 Float Total Flow Total Flow.
5 2 Float VF Quality Measured flow quality.
7 2 Float Flow Rate Measured flow rate in ft/s without any filtering applied. As reported by DSP.
9 2 Float GVF as Displayed GVF as it appears on the LCD.
Will be set to QNAN when not
displayed.
11 2 re Float Pressu
Pressure as used in calculation of GVF in configured
units.
13 2 Float Temperature
Temperature as used in calculation of GVF in
configured units.
15 2 Float SOS as Displayed SOS as it appears on the LCD.
Will be set to QNAN when not
displayed.
17 2 Float SOS Quality Measured SOS quality.
19 2 Float SOS Measured SOS in ft/s without any filtering applied. As reported by DSP.
21 2 Float
SOS Flow Rate as
Displayed
SOS Flow Rate as it appears on the LCD.
Will be set to QNAN when not
displayed.
23 2 Float
SOS Flow Rate
Quality
Measured SOS flow quality.
25 2 Float TLF as Displayed TLF as it appears on the LCD.
Will be set to QNAN when not
displayed.
27 2 Float Total TLF Measured total TLF.
29 2 Float TLF Measured TLF in ft/s without any filtering applied.
31 2 Float Band Temperature Temperature measured by the sensor band.
20959-01 Rev 02 Page 3-1