pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
2.5.5.2Reading the measurement value of SMC
The registers defined here are used to read the measurement values of each SMC.
Start reg. | Num- | Reg1 / Reg2 | Reg3 / Reg4 | Reg5 / Reg6 | Modbus | Read | Write |
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| function | access | access |
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| code |
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Address | 6 | Physical unit | Measurement | Standard | 3, 4 | U/A/S | none |
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| value of SMC | deviation |
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Figure 2.5.5.2.1: Definition of register at Address. Measurement value of each SMC.
Description | Address | Text | Unit | Min value | Max value |
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SMC1 | 2472 | R glass | MOhm | 30 |
| 600 |
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SMC2 | 2504 | R reference | kOhm | 0.25 |
| 100 |
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SMC3 | 2536 | R auxiliary | kOhm | 0.25 |
| 100 |
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SMC4 | 2568 | E pH vs. ref | mV |
| 900 |
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SMC5 | 2600 | E SG vs. ref | mV |
| 900 |
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SMC6 | 2632 | E aux vs. ref | mV |
| 50 |
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SMC7 | 2664 | E reference | mV |
| 900 |
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SMC8 | 2696 | pH act | pH |
| 14 |
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SMC9 | 2728 | T act | K | 253 |
| 403 |
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Figure 2.5.5.2.2: | Full list of register addresses for the measurement values of | SMC1 to SMC9 |
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Example: |
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Command: SMC1 read |
| Modbus address: 2472 | Length: 6 | Type: 3 | Read | ||||||
Parameter: | Unit | Value |
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| Standard dev. |
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Format: | Hex | Float |
| Float |
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Value: | 0x8000 | 247.56 |
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| 0.02 |
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Figure 2.5.5.2.3: Example to read register 2472. Physical unit is MOhm (0x8000), the measurement value of SMC1 is 247.66 MOhm, standard deviation of SMC1 is 0.02 MOhm
624300/01 | page 25 / 67 |