pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 41/ 67
The differentf unctionalitiesof product calibration (CP6) are accessible through the followingsensor
commands:
Initial measurement
Assignment
Cancel
Restorestandard calibration
Restoreproduct calibration
All commandsare executed by writing a command value to the register 5340 except for assignment
wherethe cali brationvalue is written to register 5322 (see below).
Definitiono fth e commandsfor product calibration
The commandsfor register 5340 are defined as follows:
Code Hex Definition ofcommands
0x01 Perform initialm easurement
0x02 Cancel an active productcalibration
0x03 Restorea standardcalibration from an activeproduct calibration
0x04 Restorea productcalibration from an activestandard calibration
Figure 2.7.3.2.2:Definition of the commands related to the product calibration
Start
register Number of
registers Reg1/ Reg2 Modbus
function code Read
access Write
access
5340 2 Code as defined in Figure 2.7.3.2.2 3,4, 16 A/S A/S
Figure 2.7.3.2.3:Definition of register 5340
2.7.3.2.1 Productcalibration: Initial measurement
Upon processsam ple collectionf or laboratory analysisthe commandfor initial measurement is sent to
the sensor.
This is achievedby writing the command 0x01 to register 5340 which performs the initial measurement
and storesthe corresponding measurement values in the sensor.
Command: CP6:Initial measurement Modbus address: 5340 Length: 2Type: 16 Write
Parameter: Command
Format: Hex
Value: 0x01
Figure 2.7.3.2.1.1:Example to start the product calibration procedure. Writing the command code 0x01
(initialm easurement)to the CP6 command register 5340.
After successful initialm easurementthe correspondingcalibration status (register 5318, figure
2.7.4.2.1) is “CP6initial measurement”(0x08000000) (seef igure 2.7.4.1.1).
The sensorcontinues measuring using the prior standard calibration.