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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 54 / 67
By means of register 9530, the specialist can define for each available calibration standard if the
specific standard is available.
Start
register
Number of
registers
Reg1 / Reg2
(Bit, see figure 2.7.10.2.8)
Modbus
function code
Read
access
Write
access
9530 2 Selected standard fields 3, 4 U/A/S S
Figure 2.7.10.2.9: Selected calibration standards within one given set.
Command: Selected standard fields
Modbus address: 9530 Length: 2 Type: 3
Read
Parameter: Standard fields
Format: Hex
Value:
0x02480FFF
Figure 2.7.10.2.10: Example to read the selected calibration standards. The value 0x02480FFF says
that:
all 12 calibration standards are selected for manual selection
only calibration standards 3, 7 and 10 are selected for automatic recognition
Command: Selected standard fields
Modbus address: 9530 Length: 2 Type: 16
Write
Parameter: Standard fields
Format: Hex
Value:
0x05540FFF
Figure 2.7.10.2.11: Example to set the standard fields to 12 calibration standards for manual calibration
and calibration standard 3 (0x00040000), 5 (0x00100000), 7 (0x00400000), 9 (0x01000000) and
11 (0x04000000) for automatic recognition.
Attention:
The standards selected for automatic recognition must exhibit a difference in pH of at least 2 pH units.
Figure 2.7.10.2.12: Illustration from the ARC Sensor Configurator software tool for registers 9528 and
9530. For this example, the HAMILTON set of calibration standard is selected.
On the left half of the figure, the availability of the calibration standards 1-12 is shown, as defined
in register 9528. In the left column, the availiability for manual calibration is shown (all
standards). In the right column, the availability for automatic recognition is given (all
standards as well).
On the right half of the figure, the individual selection defined by the specialist is shown as read
from register 9530. In the left column, the selection for manual selection is shown (all
standards). In the right column the selection for automatic recognition is given (calibration
standards 4, 7 and 10).