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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 52 / 67
2.7.10.2 Definitions for Individual Sets of Calibration Standards
Once the operator has selected a set of calibration standards (register 9474) the register 9504 and
following give all information on the selected set of calibration standards.
Start
register
Number of
registers
Reg1 … Reg8
(16 ASCII characters)
Modbus
function code
Read
access
Write
access
9504 8 Manufacturer of the selected set 3, 4 U/A/S none
9512 8 Info 1 of the selected set 3, 4 U/A/S none
9520 8 Info 2 of the selected set 3, 4 U/A/S none
Figure 2.7.10.2.1: Definition of registers 9504 to 9520.
Command: manufacturer of set
Modbus address: 9504 Length: 8 Type: 3
Read
Parameter: Text
Format: Character
Value:
HAMILTON
Figure 2.7.10.2.2: Example to read the description (in this case, the set 0x01 is selected)
Within one set of calibration standards, a maximum of 12 calibration standards are available. In the
following registers, the details of each calibration standard is given:
Start register Description
9536 Nominal value and tolerance of calibration standard 1
9552 Nominal value and tolerance of calibration standard 2
9568 Nominal value and tolerance of calibration standard 3
9584 Nominal value and tolerance of calibration standard 4
9600 Nominal value and tolerance of calibration standard 5
9616 Nominal value and tolerance of calibration standard 6
9632 Nominal value and tolerance of calibration standard 7
9648 Nominal value and tolerance of calibration standard 8
9664 Nominal value and tolerance of calibration standard 9
9680 Nominal value and tolerance of calibration standard 10
9696 Nominal value and tolerance of calibration standard 11
9712 Nominal value and tolerance of calibration standard 12
Figure 2.7.10.2.3: Definition for the register range from 9536 until 9720.
Start
register
Number
of
registers
Reg1 /
Reg2
(Float)
Reg3 /
Reg4
(Float)
Reg5 /
Reg6
(Float)
Reg7 /
Reg8
(Float)
Modbus
function
code
Read
access
Write
access
9536,
9552,
…
8 Calibr.
standard
nominal
value
[pH]
Tolerance
of nominal
value (±)
[pH]
Nominal
electrical
potential
[mV]
Tolerance
of electrical
potential
(±) [mV]
3, 4 U/A/S none
Figure 2.7.10.2.4: Definition for registers 9536 until 9720.
Command: Read standard 4
Modbus address: 9584 Length: 8 Type: 3
Read
Parameter: Nominal value
[pH]
Tolerance
(±) [pH]
Nominal electrical
potential
[mV]
Tolerance of
electrical potential
(±) [mV]
Format: Float Float Float Float
Value:
4.01 0.02 180 80
Figure 2.7.10.2.5: Example to read the values for the calibration standard 4.