pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
By means of register 9530, the specialist can define for each available calibration standard if the specific standard is available.
Start | Number of | Reg1 / Reg2 | Modbus | Read | Write |
register | registers | (Bit, see figure 2.7.10.2.8) | function code | access | 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 |
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Format: | Hex |
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Value: | 0x02480FFF |
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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 |
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Format: | Hex |
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Value: | 0x05540FFF |
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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).
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