pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 30/ 67
2.6.3 PA12: Moving Average R
pH ARC Sensorsallow to have a separate moving average on secondary measurement values:
Glass resistance
Reference resistance
The moving averagecan be applied on 1 to 16 3-s measurement values. The default value is 4.
Especiallyif high resistancesare measured, it is recommended to choose a higher moving average.
2.6.3.1 Description of PA12 (Moving Average R)
In register 3456, a plain text ASCII description of PA12 is given.
Start
register Number of
registers Reg1…Reg8
16 ASCII characters Modbus
function code Read
access Write
access
3456 8 Description ofPA12 3, 4 U/A/S none
Figure 2.6.3.1.1:Definition of register 3456.
Command: Movingaverage text Modbusaddress: 3456 Length: 8Type: 3Read
Parameter: Text
Format: Character
Value: Moving averageR
Figure 2.6.3.1.2: Examplet o read the descriptionf or “Moving averageR“.
2.6.3.2 Selecting the Physical Unit and Writingthe Value for PA12
In register 3464,the available physical units for PA12 are defined.
Start
register Number of
registers Reg1/ Reg2
(bitwise defined) Modbus
function code Read
access Write
access
3464 2 Available physical units for PA12 3, 4 U/A/S none
Figure 2.6.3.2.1:Definition of register 3368.
Command: Movingaverage av. units Modbusaddress: 3464 Length: 2Type: 3Read
Parameter: Units
Format: Hex
Value: 0x01
Figure 2.6.3.2.2:Example to read the available physical units for PA12. The only one available hereis
“none”(0x01). For the definition of the physical units see chapter 2.5.1.
Start
register Number of
registers Reg1/ Reg2
(bitwise defined) Reg3 / Reg4 Modbus
function code Read
access Write
access
3466 4 Selectphysical unit
for PA12 Valuef or PA12
(1-16, default:4) 16 none S
Figure 2.6.3.2.3:Definition of register 3466. Only one bit for the physical unit can be set. PA12 can be
set to the values 1-16.