pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
2.5.3Primary Measurement Channel 6 (Temperature)
2.5.3.1Description of PMC6
In register 2400, a plain text ASCII description of PMC6 is given
Start | Number of | Reg1 … Reg8 | Modbus | Read | Write |
register | registers | 16 ASCII characters | function code | access | access |
2400 | 8 | Description of PMC6 | 3, 4 | U/A/S | none |
Figure 2.5.3.1.1: Definition of register 2400.
Command: PMC6 text | Modbus address: 2400 | Length: 8 | Type: 3 | Read | |||
Parameter: | Text |
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Format: | Character |
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Value: | T |
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Figure 2.5.3.1.2: Example to read the description. It is “T”(Temperature).
2.5.3.2Selecting the Physical Unit for PMC6
In register 2408, the available physical units of PMC6 are defined.
Start | Number of | Reg1 / Reg2 |
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register | registers | (bitwise defined) | function code |
| access | access | ||||
2408 | 2 |
| Available physical units of PMC6 | 3, 4 |
| U/A/S | none | |||
Figure 2.5.3.2.1: Definition of register 2408. |
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Command: PMC6 available units | Modbus address: 2408 | Length: 2 | Type: 3 | Read | ||||||
Parameter: | Units |
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Format: |
| Hex |
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Value: |
| 0x06 |
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Figure 2.5.3.2.2: Example to read the available physical unit for PMC6. K (0x02) + °C (0x04), total 0x06.
In register 2410, the active physical unit of PMC6 can be selected, by choosing one of the physical units that are defined in register 2408.
Start | Number of | Reg1 / Reg2 | Modbus | Read | Write |
register | registers | (bitwise defined) | function code | access | access |
2410 | 2 | Selected active physical unit of PMC6 | 16 | none | U/A/S |
Figure 2.5.3.2.3: Definition of register 2410. Only one bit can be set.
Command: PMC6 set unit | Modbus address: 2410 | Length: 2 | Type: 16 | Write | |||
Parameter: | Unit |
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Format: | Hex |
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Value: | 0x04 |
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Figure 2.5.3.2.4: Example to set the physical unit of PMC6 to °C (0x04).
Attention:
Changing the physical unit has also an influence on the output of AO1 / AO2, as the same physical unit is active for the analog outputs. All limits of the 4-20 mA analog output have to be redefined after changing the physical unit!
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