Hamilton Electronics EPHUM011 2.5.3 Primary Measurement Channel 6 (Temperature)

pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
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2.5.3 Primary Measurement Channel 6 (Temperature)
2.5.3.1 Description of PMC6
In register 2400, a plain text ASCII description of PMC6 is given
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register Number of registers Reg1…Reg8 16 ASCII characters Modbus function code Read access Write access
2400 8 Description of PMC6 3,4 U/A/S none
Figure 2.5.3.1.1:Definition of register 2400.
Command: PMC6t ext Modbusaddress: 2400 Length: 8Type: 3Read
Parameter: Text
Format: Character
Value: T
Figure 2.5.3.1.2: Examplet o read the description. It is “T”(Temperature).
2.5.3.2 Selecting the Physical Unit for PMC6
In register 2408,the available physical units of PMC6 are defined.
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register Number of registers Reg1/ Reg2 (bitwise defined) Modbus function code Read access Write access
2408 2 Available physicalunits of PMC6 3, 4 U/A/S none
Figure 2.5.3.2.1:Definition of register 2408.
Command: PMC6available units Modbusaddress: 2408 Length: 2Type: 3Read
Parameter: Units
Format: Hex
Value: 0x06
Figure 2.5.3.2.2: Examplet o 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.
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register Number of registers Reg1/ Reg2 (bitwise defined) Modbus function code Read access Write access
2410 2 Selected activephysical 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 setunit Modbusaddress: 2410 Length: 2Type: 16 Write
Parameter: Unit
Format: Hex
Value: 0x04
Figure 2.5.3.2.4:Example to set the physical unit of PMC6 to °C (0x04).
Attention:
Changingt hephysical unit has also an influence on the output of AO1 / AO2, as the same physical unit
is activef or the analogoutputs. All limits of the 4-20 mA analog output have to be redefined after
changing the physicalunit!