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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 30 / 67
2.6.3 PA12: Moving Average R
pH ARC Sensors allow to have a separate moving average on secondary measurement values:
Glass resistance
Reference resistance
The moving average can be applied on 1 to 16 3-s measurement values. The default value is 4.
Especially if high resistances are 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 of PA12 3, 4 U/A/S none
Figure 2.6.3.1.1: Definition of register 3456.
Command: Moving average text
Modbus address: 3456 Length: 8 Type: 3
Read
Parameter: Text
Format: Character
Value:
Moving average R
Figure 2.6.3.1.2: Example to read the description for “Moving average R“.
2.6.3.2 Selecting the Physical Unit and Writing the 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: Moving average av. units
Modbus address: 3464 Length: 2 Type: 3
Read
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 here is
“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 Select physical unit
for PA12
Value for 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.