pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
2.6.2.1Description of PA9 (Moving Average)
In register 3360, a plain text ASCII description of PA9 is given.
Start | Number of | Reg1 … Reg8 | Modbus | Read | Write |
register | registers | 16 ASCII characters | function code | access | access |
3360 | 8 | Description of PA9 | 3, 4 | U/A/S | none |
Figure 2.6.2.1.1: Definition of register 3360.
Command: Moving average text | Modbus address: 3360 | Length: 8 | Type: 3 | Read | |||
Parameter: | Text |
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Format: | Character |
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Value: | Moving average |
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Figure 2.6.2.1.2: Example to read the description for “Moving average“.
2.6.2.2Selecting the Physical Unit and Writing the Value for PA9
In register 3368, the available physical units for PA9 are defined.
Start | Number of | Reg1 / Reg2 | Modbus |
| Read | Write | ||||
register | registers | (bitwise defined) | function code |
| access | access | ||||
3368 | 2 |
| Available physical units for PA9 | 3, 4 |
| U/A/S | none | |||
Figure 2.6.2.2.1: Definition of register 3368. |
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Command: Moving average av. units | Modbus address: 3368 | Length: 2 | Type: 3 | Read | ||||||
Parameter: | Units |
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Format: |
| Hex |
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Value: |
| 0x01 |
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Figure 2.6.2.2.2: Example to read the available physical units for PA9. The only one available here is “none”(0x01). For the definition of the physical units see chapter 2.5.1.
Start | Number of | Reg1 / Reg2 | Reg3 / Reg4 | Modbus | Read | Write |
register | registers | (bitwise defined) |
| function code | access | access |
3370 | 4 | Select physical unit | Value for PA9 | 16 | none | S |
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Figure 2.6.2.2.3: Definition of register 3370. Only one bit for the physical unit can be set. PA9 can be set to the value 1-16. A value of 1 does not influence the response time of the sensor, a value of 16 increases the response time of the sensor to 48 s.
By writing to register 3370 the active physical unit for PA9 can be selected by choosing one of the physical units that are defined in register 3368. The value of the parameter can be set as well.
Command: Moving average | Modbus address: 3370 | Length: 4 | Type: 16 | Write | ||
Parameter: | Unit | Value |
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Format: | Hex | Decimal |
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Value: | 0x01 | 12 |
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Figure 2.6.2.2.4: Example to set the physical unit of PA9 to “none”(0x01) and the value of the moving average to 12.
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