pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
The different functionalities of product calibration (CP6) are accessible through the following sensor commands:
Initial measurement
Assignment
Cancel
Restore standard calibration
Restore product calibration
All commands are executed by writing a command value to the register 5340 except for assignment where the calibration value is written to register 5322 (see below).
Definition of the commands for product calibration |
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The commands for register 5340 are defined as follows: |
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Code Hex |
| Definition of commands |
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0x01 |
| Perform initial measurement |
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0x02 |
| Cancel an active product calibration |
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0x03 |
| Restore a standard calibration from an active product calibration |
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0x04 |
| Restore a product calibration from an active standard calibration |
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Figure 2.7.3.2.2: | Definition of the commands related to the product calibration |
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Start |
| Number of | Reg1 / Reg2 | Modbus | Read | Write | ||
register |
| registers |
| function code | access | access | ||
5340 |
| 2 |
| Code as defined in Figure 2.7.3.2.2 | 3, 4, 16 | A/S | A/S | |
Figure 2.7.3.2.3: Definition of register 5340
2.7.3.2.1Product calibration: Initial measurement
Upon process sample collection for laboratory analysis the command for initial measurement is sent to the sensor.
This is achieved by writing the command 0x01 to register 5340 which performs the initial measurement and stores the corresponding measurement values in the sensor.
Command: CP6: Initial measurement | Modbus address: 5340 | Length: 2 | Type: 16 | Write | |||
Parameter: | Command |
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Format: | Hex |
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Value: | 0x01 |
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Figure 2.7.3.2.1.1: Example to start the product calibration procedure. Writing the command code 0x01 (initial measurement) to the CP6 command register 5340.
After successful initial measurement the corresponding calibration status (register 5318, figure 2.7.4.2.1) is “CP6 initial measurement”(0x08000000) (see figure 2.7.4.1.1).
The sensor continues measuring using the prior standard calibration.
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