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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 45 / 67
Command: Calibration status CP1
Modbus address: 5158 Length: 6 Type: 3
Read
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 calibration is not stable”(0x00000080). The physical
unit of the last successful calibration is pH (0x00001000) and the last successful calibration has
been performed at pH 4.01.
Command: Calibration status CP2
Modbus address: 5190 Length: 6 Type: 3
Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value:
0x00000080 0x00001000 7
Figure 2.7.4.1.4: Example to read the calibration status of CP2 after calibrating CP2 at 0 = auto. All bits
of CP2 are zero (0x00000080), indicating that the calibration was successful. The physical unit of
the last calibration is pH (0x00001000) and the last successful calibration has been performed at
pH 7.
Command: Calibration status CP2
Modbus address: 5190 Length: 6 Type: 3
Read
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 as CP1. 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 Calibration Status of CP6 (Product Calibration)
The calibration status and the current state of the product calibration process (CP6) is read in the
calibration status register 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
(see figure
2.7.4.1.1)
Physical unit of
the last
successful
calibration CP6
(always pH)
pH value 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.