pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 52/ 67
2.7.10.2 Definitions for Individual Sets of Calibration Standards
Once the operatorhas selected a set of calibration standards (register 9474) the register 9504 and
following give allinformation 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 ofthe selected set 3, 4 U/A/S none
9512 8 Info 1 of the selectedset 3, 4 U/A/S none
9520 8 Info 2 of the selectedset 3, 4 U/A/S none
Figure 2.7.10.2.1:Definition of registers 9504 to 9520.
Command:m anufacturerof set Modbusaddress: 9504 Length: 8Type: 3Read
Parameter: Text
Format: Character
Value: HAMILTON
Figure 2.7.10.2.2: Examplet o read the description (in this case, the set 0x01 is selected)
Within one setof 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 Nominalv alueand tolerance of calibration standard 1
9552 Nominalv alueand tolerance of calibration standard 2
9568 Nominalv alueand tolerance of calibration standard 3
9584 Nominalv alueand tolerance of calibration standard 4
9600 Nominalv alue and tolerance of calibration standard 5
9616 Nominalv alueand tolerance of calibration standard 6
9632 Nominalv alueand tolerance of calibration standard 7
9648 Nominalv alueand tolerance of calibration standard 8
9664 Nominalv alueand tolerance of calibration standard 9
9680 Nominalv alueand tolerance of calibration standard 10
9696 Nominalv alueand tolerance of calibration standard 11
9712 Nominalv alueand 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: Definitionf or registers9536 until 9720.
Command: Readstandard 4 Modbusaddress: 9584 Length: 8Type: 3Read
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.