"Larry W4CSC" wrote in message
...
Those problems are usually because of the hardware connections associated
with CTS (clear to send) and RTS (request to send) lines not being held
high. RS-232 is made for hardware handshaking between devices so the
listening device can stop the transmission when its buffer (bit bucket?)
is
full. It goes way back to really dumb terminals that have no storage in
them for data. Jumpers added to the DB9 or DB25 connectors can make it
run
wide open to hyperterm on dumb data....er, ah, like NMEA..(c;

In Hyperterminal, you can goto File-Properties, click the button Configure,
goto Flow Control and select None.

And at the Properties page, tab Settings, goto ASCII setup and select "Send
line ends with line feeds" in order to send a line feed when you type an
NMEA sentence manually.

But a much better substute for HyperTerminal is TeraTerm.

Meindert