pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
2.7.10.2 Definitions for Individual Sets of Calibration Standards
Once the operator has selected a set of calibration standards (register 9474) the register 9504 and following give all information on the selected set of calibration standards.
Start | Number of | Reg1 … Reg8 | Modbus | Read | Write |
register | registers | (16 ASCII characters) | function code | access | access |
9504 | 8 | Manufacturer of the selected set | 3, 4 | U/A/S | none |
9512 | 8 | Info 1 of the selected set | 3, 4 | U/A/S | none |
9520 | 8 | Info 2 of the selected set | 3, 4 | U/A/S | none |
Figure 2.7.10.2.1: Definition of registers 9504 to 9520.
Command: manufacturer of set | Modbus address: 9504 | Length: 8 | Type: 3 | Read | |
Parameter: | Text |
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Format: | Character |
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Value: | HAMILTON |
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Figure 2.7.10.2.2: Example to read the description (in this case, the set 0x01 is selected)
Within one set of calibration standards, a maximum of 12 calibration standards are available. In the following registers, the details of each calibration standard is given:
Start register | Description |
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9536 |
| Nominal value and tolerance of | calibration standard 1 |
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9552 |
| Nominal value and tolerance of | calibration standard 2 |
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9568 |
| Nominal value and tolerance of | calibration standard 3 |
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9584 |
| Nominal value and tolerance of | calibration standard 4 |
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9600 |
| Nominal value and tolerance of | calibration standard 5 |
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9616 |
| Nominal value and tolerance of | calibration standard 6 |
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9632 |
| Nominal value and tolerance of | calibration standard 7 |
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9648 |
| Nominal value and tolerance of | calibration standard 8 |
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9664 |
| Nominal value and tolerance of | calibration standard 9 |
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9680 |
| Nominal value and tolerance of | calibration standard 10 |
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9696 |
| Nominal value and tolerance of | calibration standard 11 |
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9712 |
| Nominal value and tolerance of | calibration standard 12 |
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Figure 2.7.10.2.3: | Definition for the register range from 9536 until 9720. |
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Start | Number | Reg1 / | Reg3 / | Reg5 / | Reg7 / | Modbus | Read | Write | ||
register | of | Reg2 | Reg4 | Reg6 | Reg8 | function | access | access | ||
| registers | (Float) | (Float) | (Float) | (Float) | code |
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9536, | 8 |
| Calibr. | Tolerance | Nominal | Tolerance | 3, 4 | U/A/S | none | |
9552, |
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| standard | of nominal | electrical | of electrical |
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| nominal | value (±) | potential | potential |
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| value | [pH] | [mV] | (±) [mV] |
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| [pH] |
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Figure 2.7.10.2.4: Definition for registers 9536 until 9720.
Command: Read standard 4 | Modbus address: 9584 | Length: 8 | Type: 3 | Read | ||
Parameter: | Nominal value | Tolerance | Nominal | electrical | Tolerance of |
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| [pH] | (±) [pH] | potential | electrical potential | ||
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Format: | Float | Float | Float |
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Value: | 4.01 | 0.02 | 180 |
| 80 |
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Figure 2.7.10.2.5: Example to read the values for the calibration standard 4.
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