pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
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Command: Calibrationstatus CP1 Modbusaddress: 5158 Length: 6Type: 3Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value: 0x00000080 0x00001000 4.01
Figure 2.7.4.1.3: Example to read the calibration status of CP1 after calibration CP1 at 0 = auto. The
status message is: “CP1 pH reading during calibrationi s not stable”(0x00000080). The physical
unit of the last successful calibration is pH (0x00001000) and the last successful calibration has
been performed atpH 4.01.
Command: Calibrationstatus CP2 Modbusaddress: 5190 Length: 6Type: 3Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value: 0x00000080 0x00001000 7
Figure 2.7.4.1.4: Example to readt hecal ibrationstatus of CP2 after calibratingCP2 at 0 = auto. All bits
of CP2 are zero (0x00000080), indicatingthat t hecalibration was successful. The physical unit of
the last calibration is pH(0x 00001000)and the last successful calibration has been performed at
pH 7.
Command: Calibrationstatus CP2 Modbusaddress: 5190 Length: 6Type: 3Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value: 0x00000180 0x00001000 7
Figure 2.7.4.1.5: Example to read the calibration status of CP2 after attempt to calibrate CP2 at pH
4.01, which is the same asCP1. The value is 0x00000180= 0x00000080+ 0x00000100. Shown
is still 0x00000080 of CP1 and new 0x00000100 of CP2, which says: “CP2 space to CP1 < pH
1.0”.
2.7.4.2 Reading the CalibrationStatus of CP6 (Product Calibration)
The calibration statusand the current state of the product calibration process (CP6) is read in the
calibration statusregister for CP6 (register 5318).
Start
register Number of
registers Reg1/ Reg2 Reg3 / Reg4 Reg5 / Reg6 Modbus
function
code
Read
access Write
access
5318 6 Status CP6
(seef igure
2.7.4.1.1)
Physical unit of
the last
successful
calibration CP6
(alwayspH)
pHv alue of the
last successful
calibration CP6
3, 4 U/A/S none
Figure 2.7.4.2.1:Definition of register 5318 for CP6. For examples,see following chapters.