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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 26 / 67
2.6 Configuration of the Measurement
This chapter describes the configuration of PMC1 and PMC6 by means of measurement parameters
(PA).
2.6.1 Available Parameters
In register 3072, all available parameters (PA) are given.
Start
register
Number of
registers
Reg1 / Reg2
(bitwise defined)
Modbus
function code
Read
access
Write
access
3072 2 Available parameters (see figure 2.6.1.2) 3, 4 U/A/S none
Figure 2.6.1.1: Definition of register 3072.
Bit # Hex value Description Definition in pH ARC Sensors
0 (LSB) 0x0001 PA1 not available
not available
7 0x0080 PA8 not available
8 0x0100 PA9 Moving average
9 0x0200 PA10 not available
10 0x0400 PA11 not available
11 0x0800 PA12 Moving average R
not available
15 (MSB) 0x8000 PA16 not available
Figure 2.6.1.2: Bitwise definition of parameters PA1 to PA16, valid for pH ARC Sensors
Command: Available parameters
Modbus address: 3072 Length: 2 Type: 3
Read
Parameter: Measurement
parameters
Format: Hex
Value:
0x0900
Figure 2.6.1.3: Example to read the available parameters. The value 0x0900 corresponds to 0x0100
(PA9) + 0x0800 (PA12). Parameter 9 and 12 are available.
Genereal note:
PA1 to PA8 use FLOAT as data format for its values
PA9 to PA16 use UNSIGNED INT as data format for its values.