Chapter 4 _________________________________________________________________ Operation 
 
VAISALA ________________________________________________________________________ 35 
Terminal Application Settings 
The serial interface settings of the service port are presented in Table 6 
below. The settings are fixed, and cannot be changed by the user. 
Table 6  Serial Interface Settings 
The steps below describe how to connect to the transmitter using the 
PuTTY terminal application for Windows (available for download at 
www.vaisala.com/software) and a USB serial interface cable: 
1.  Connect the USB serial interface cable between your computer and 
the service port of the transmitter. 
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.  
 
Note: You can check which port the USB cable is using with the 
Vaisala USB Instrument Finder program that has been installed 
in the Windows Start menu. 
4.  Check that the other serial settings are correct for your connection, 
and change if necessary. Flow control should be set to None unless 
you have a reason to change it. 
5.  Click the Open button to open the connection window and start 
using the serial line. 
NOTE 
If PuTTY is unable to open the serial port you selected, it will show you 
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. You must 
enable either local echo (on the terminal side) or remote echo (on 
the transmitter side, adjustable using the ECHO command). 
 
To access the configuration screen while a session is running, click 
the right mouse button over the session window, and select Change 
Settings... from the pop-up menu.