Vaisala PTU300 - Manual (Page 95)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 93
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Figure 58 Opening a Telnet Connection
4. Click the Open button to open the connection window and start
using the Telnet session.
If PuTTY is unable to connect the IP address you entered, it will
show you an error message instead. If this happens, check the
IP address and the connections, restart PuTTY, and try again.