HyperTerminal (hypertrm) used to be the classic built in Windows utility for reading & writing to COM & TCP/IP ports
, dial-up modems etc. & still is if you are running Windows XP.
I think with Vista & certainly Windows 7 it was discontinued. However if you can steal a copy from an XP installation
it will work fine with either of the newer OS, allowing you to see exactly what is coming out of any particular COM port.
To install, copy the whole hyperterm folder including the executable & associated drivers, & pop it in Program Files or Program Files (x86) folder if you have 64 bit OS. Create a shortcut to hypertrm.exe & you are in business.
To view output of COM port:
1) Run HyperTerminal - New Connection window will appear
2) Give connection a name of your choice. Doesn't matter what it is but avoid COMx as they are reserved.
3) Press OK - new window will appear - ignore dial box's, but bottom "Connect using" box will have drop down list of available COM ports
- select as required.
4) Press OK - new port settings window will appear - change baud rate to suite (leave others)
5) Press OK & you should immediately see NMEA
data stream (if there is one on that particular port)
6) You will be invited to save this connection when done so you can choose .ht shortcut from hyperterm folder next time & be connected straight away.
Note if you are using virtual COM ports they will not appear in drop down list as they are not listed in Device Manager. You need to manually create an entry in Device Manager to match.