pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 57/ 67
2.8 Sensor Status

2.8.1 Temperature Ranges

In registers4608, 4612 and 4616 three different temperature ranges are defined:
Operation –inthis range the sensor will workproperly (current output, Modbus
communication),except the m easurement,which is stopped until the temperature is back in
the measurement range. In this case the last value of measurement will be frozen and sent to
analog interfaces.
Measurement –inthis range the sensoris able to measure.
Calibration –inthis range the sensor can becalibrated.
Start
register Number of
registers Reg1/ Reg2 Reg3 / Reg4 Modbus
function
code
Read
access Write
access
4608 4 Operating
temperaturemin [ °C] Operating
temperaturem ax [°C] 3, 4 U/A/S none
4612 4 Measurement
temperaturemin [ °C] Measurement
temperaturem ax [°C] 3, 4 U/A/S none
4616 4 Calibration
temperaturemin [ °C] Calibration
temperaturem ax [°C] 3, 4 U/A/S none
Figure 2.8.1.1:Definition of register 4608, 4612 and 4616.
Command: OperatingT range Modbus address: 4608 Length: 4Type: 3Read
Parameter: Operating T min
[°C] Operating T max
[°C]
Format: Float Float
Value: -20 130
Figure 2.8.1.2: Example to read the operating temperaturev aluesmi n andm ax.
Command: MeasurementT range Modbusaddress: 4612 Length: 4Type: 3Read
Parameter: Measurement T
min [°C] MeasurementT
max [°C]
Format: Float Float
Value: -20 130
Figure 2.8.1.3: Example to read the measurement temperaturev aluesmin andmax.
Command: CalibrationT range Modbusaddress: 4616 Length: 4Type: 3Read
Parameter: Calibration T min
[°C] Calibration T max
[°C]
Format: Float Float
Value: 5 50
Figure 2.8.1.4:Ex ampleto read the calibration temperature values min and max.