6.3 Terminal application settings for digital probes
The following steps describe how to connect to digital probes using the PuTTY terminal
application for Windows (available for download at http://www.vaisala.com/software) and the
USB serial interface.
If you have an analog probe, you can still connect to the serial line by following the instructions
in Accessing serial line command interface from analog or Modbus mode (page 36).
1. Connect Vaisala USB cable 219690 between your PC and the probe.
2. Start the PuTTY application.
3. Select the Serial settings category, and check that the correct COM port is selected in the
Serial line to connect to field.
To check which port the USB cable is using, select Start > Vaisala > Vaisala USB
Instrument Finder.
4. Check that the other serial settings are correct for your connection, and change if
necessary.
5. To open the connection window and start using the serial line, select Open.
If PuTTY is unable to open the serial port you selected, it shows an error message instead.
If this happens, restart PuTTY and check the settings.
6. You may need to adjust the Local echo setting in the Terminal category to see what you
are typing on the serial line. To access the configuration screen while a session is running,
right-click over the session window, and select Change Settings.
If the probe is in Modbus mode, to access the serial port command interface, follow the
instructions in Accessing serial line command interface from analog or Modbus mode
(page 36).
Chapter 6 – Serial line communication
35
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