SENTRON A120-001, Technical Manual

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5.2 Examples
Below some communication examples on the various protocol functions are presented to illustrate
communication with the AD Converter and USB Interface modules.
5.2.1 Performing a single point calibration
pH7 calibration sequence :

Rinse the probe with deionized water.

Place ISFET sensor and reference in the calibration pH7 buffer solution. Initiate the
calibration process by sending the S
tart Calibration command: CLR!<CR>

Wait for the AD Converter or USB interface module to acknowledge, receive: 082 013 013
The AD converter or USB interface module is now ready to receive the calibration pH 7
command…

Initiate the pH7 calibration by sending the calibration pH 7 command: 113!<CR>
Allow some time for the module to stabilize (this may take up to 2 minutes maximum)…

Wait for the module to stabilize, receive bytes: 003 013 010

End the calibration process, send: QIT!<CR>

Wait for the module to confirm calibration end, receive: 084 013 010
Rinse the ISFET sensor and reference electrode with de-mineralized water…
The calibration is completed.
For performing a pH 2, 4, 10 or 12 calibration, repeat the sequence and use the appropriate
calibration command bytes. See chapter 5.1 for the command bytes of each pH buffer solution.