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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 34 / 67
Command: Read calibration stability
Modbus address: 5128 Length: 4 Type: 3
Read
Parameter: Max drift pH
[pH/min]
Max drift Temp
[K/min]
Format: Float Float
Value:
0.1 0.5
Figure 2.7.2.1.5: Example to read the calibration stability.
Command: Set calibration stability
Modbus address: 5128 Length: 4 Type: 16
Write
Parameter: Max drift pH
[pH/min]
Max drift Temp
[K/min]
Format: Float Float
Value:
0.2 0.5
Figure 2.7.2.1.6: Example to set the calibration stability.
Attention:
The stability criteria defined in register 5128 is valid for CP1 and CP2 only, but NOT for CP6.
2.7.2.2 Calibration Point 6 (Product Calibration)
The limits for calibration point 6 are given in register 5312.
Start
register
Number of
registers
Reg1 / Reg2 Reg3 / Reg4 Reg5 / Reg6 Modbus
function code
Read
access
Write
access
5312 6 Physical unit
currently
active for
CP6
Min value for
CP6 (in the
physical unit
as defined in
Reg1 and 2)
Max value for
CP6 (in the
physical unit
as defined in
Reg1 and 2)
3, 4 U/A/S none
Figure 2.7.2.2.1: Definition of register 5312 for CP6.
Command: Calibration limits CP6
Modbus address: 5312 Length: 6 Type: 3
Read
Parameter: Unit Min value Max value
Format: Hex Float Float
Value:
0x01000 0 14
Figure 2.7.2.2.2: Example to read the limits of CP6. The active physical unit is pH, the min value is pH
0 and the max value is pH 14.
Note: the definition of min and max is different than the one for CP1 / CP2, because CP6 can be
set to any pH value.