pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 54/ 67
By meansof register 9530,the specialist can define for each available calibration standard if the
specific standardis av ailable.
Start
register Number of
registers Reg1/ Reg2
(Bit, see figure 2.7.10.2.8) Modbus
function code Read
access Write
access
9530 2 Selected standardfi elds 3, 4 U/A/S S
Figure 2.7.10.2.9:Selected calibration standards within one given set.
Command: Selected standardfields Modbusaddress: 9530 Length: 2Type: 3Read
Parameter: Standardfields
Format: Hex
Value: 0x02480FFF
Figure 2.7.10.2.10: Example to read the selected calibration standards. The value 0x02480FFF says
that:
all 12 calibration standardsare selected for manual selection
only calibrationstandards 3, 7 and 10 are selected for automatic recognition
Command: Selected standardfields Modbusaddress: 9530 Length: 2Type: 16 Write
Parameter: Standardfields
Format: Hex
Value: 0x05540FFF
Figure 2.7.10.2.11: Exampleto set the standard fi eldsto 12 calibration standards for manual calibration
and calibration standard 3 (0x00040000), 5 (0x00100000),7 (0x 00400000),9 (0x 01000000)and
11 (0x04000000)f or automatic recognition.
Attention:
The standardsselected for automatic recognition must exhibit a difference in pH of at least 2 pH units.
Figure 2.7.10.2.12: Illustrationfrom t he ARC Sensor Configurator softwaretool f or registers 9528 and
9530. Forthis example, the HAMILTON set of calibration standardis selected.
On the left half ofthe figure, the availability of the calibration standards 1-12 is shown, as defined
in register 9528. In the left column, the availiability for manual calibration is shown (all
standards).I n the right column,the availabilityfor automatic recognition is given (all
standardsas well).
On the right halfof the figure, the individual selection defined by the specialist is shown as read
from register 9530. In the left column, the selection for manual selection is shown (all
standards).I n the right column the selectionfor automaticrecognition is given (calibration
standards4, 7 and 10).