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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 17 / 67
2.4.6 Reading the Internally Measured Output Current
Reg. 4414 / 4542 provides internal parameters of AO1 / AO2:
the setpoint to which the current is regulated in a closed loop control
the electrical current the sensor is measuring to feed the closed loop control
These values are helpful in order to compare against the externally measured electrical current.
Start
register
Number of
registers
Reg1 / Reg2 Reg3 / Reg4 Modbus
function code
Read
access
Write
access
4414 4 Set point
[mA]
AO1
Internally measured
[mA]
AO1
3, 4 U/A/S none
4542 4 Set point
[mA]
AO2
Internally measured
[mA]
AO2
3, 4 U/A/S none
Figure 2.4.6.1: Definition of register 4414 / 4542.
Command: Internal values AO1
Modbus address: 4414 Length: 4 Type: 3
Read
Parameter: Set point
[mA]
Internally measured
[mA]
Format: Float Float
Value:
9.99186 9.99742
Figure 2.4.6.2: Example to read the internal values of AO1, depending on the analog interface mode.