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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 38 / 67
Examples: (Definitions of register 5158 and 5190 used in these examples are given in chapter 2.7.4.1,
those for register 4872 in chapter 2.8.6)
Example to calibrate at CP1 with automatic recognition:
Command: Make calibration CP1
Modbus address: 5162 Length: 2 Type: 16
Write
Parameter: pH value
Format: Float
Value:
0
Figure 2.7.3.1.4: Example to start the calibration at CP1, setting a value of 0 for automatic
recognition of the calibration standard.
Example to calibrate at CP2 with automatic recognition:
Command: Make calibration CP2
Modbus address: 5194 Length: 2 Type: 16
Write
Parameter: pH value
Format: Float
Value:
0
Figure 2.7.3.1.5: Example to start the calibration at CP2, setting a value of 0 for automatic
recognition of the calibration standard.
Example to read the calibration status of CP1:
Command: Calibration status CP1
Modbus address: 5158 Length: 6 Type: 3
Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value:
0x00000000 0x00001000 4.01
Figure 2.7.3.1.6: Example to read the calibration status of CP1 after calibration CP1 at 0 = auto.
All bits of CP1 are zero (0x00000000), indicating that the calibration was successful. The
physical unit of the last calibration is pH (0x00001000) and the assigned pH value is 4.01
at 25°C.
Example to read the calibration status of CP2:
Command: Calibration status CP2
Modbus address: 5190 Length: 6 Type: 3
Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value:
0x00000000 0x00001000 7
Figure 2.7.3.1.7: Example to read the calibration status of CP2 after calibrating CP2 at 0 = auto.
All bits of CP2 are zero (0x00000000), indicating that the calibration was successful. The
physical unit of the last calibration is pH (0x00001000) and the pH value is 7.
Example to calibrate at CP1 with manual selection of the calibration standard:
Command: Make calibration CP1
Modbus address: 5162 Length: 2 Type: 16
Write
Parameter: pH value
Format: Float
Value:
4.00
Figure 2.7.3.1.8: Example to start the calibration at CP1, by means of manually selecting the
calibration standard HAMILTON DURACAL 4.01 (nominal value 4.01). The operator knows
from the certificate of the specific production lot that the actual pH value is 4.00.