pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
2.7.3.2.2Product calibration: Assignment
After successful initial measurement a correct value must be assigned to the initially stored measurement data.
This is achieved by writing the correct calibration value to register 5322.
Start | Number of | Reg1 / Reg2 |
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register | registers |
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| function code | access | access | ||
5322 | 2 |
| pH value [pH] |
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| 16 |
| none | A/S | |
Figure 2.7.3.2.2.1: Definition of register 5322 |
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Command: CP6: Assignment | Modbus address: 5322 | Length: 2 |
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Parameter: | Value |
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Format: |
| Float |
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Value: |
| 7.2 |
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Figure 2.7.3.2.2.2: Example to assign a calibration value to the above performed initial measurement. This is achieved by writing the correct pH value.
From now on the sensor is measuring using the here performed product calibration.
The calibration status (register 5318) is 0x14000000 meaning that a correct value has been assigned and that the product calibration is active (see figure 2.7.4.1.1).
2.7.3.2.3Product calibration: Cancel
To cancel an active product calibration or an active initial measurement the command 0x02 is written to register 5340.
Command: CP6: Cancel | Modbus address: 5340 | Length: 2 | Type: 16 | Write | |||
Parameter: | Command |
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Format: | Hex |
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Value: | 0x02 |
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Figure 2.7.3.2.3.1: Example to cancel an active product calibration or an initial measurement. Writing the command 0x02 (cancel) to register 5340.
Performing this action the product calibration or any initial measurements are canceled. The values of the prior product calibration are removed from the sensor’s memory. From now on the sensor is measuring using its prior CP1 / CP2 standard calibration.
The sensor’s calibration status (register 5318) will be reading 0x00 again (see figure 2.7.4.1.1).
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