Hamilton Electronics EPHUM011 - Manual (Page 17)

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.