Are you looping back the control signals on the PC side?
RTS to CTS, DTR to DTR (& optionally CD)?
If hardware handshaking is enabled by the application,
and and CTS is not asserted (high in this case), the
serial port will NOT send data.

http://www.lammertbies.nl/comm/cable/RS-232.html


Vic Fraenckel wrote:
> First, let me thank those that have replied. I appreciate you taking the 
> time.
> 
> This is getting curiouser and curiouser. I dug out another computer with a 
> serial port and put the Wisp2 software on it and connected to the '628 and 
> lo and behold it worked. This rules out the '628. The RS232 port on my 
> development computer will send and receive data from my application board 
> (16F876A with a serial interface and connected to an ADXL202 accelerometer). 
> The board sends a reading from the ADXL on demand from the host (in this 
> case a terminal program) this RS232 link (COM1)  works perfectly sending and 
> receiving, but the development system cannot communicate with the '628 over 
> the same port. I cannot account for this behaviour! Why does the comm port 
> (COM1) work for some apps and not for others? The windows device manager 
> shows the port is working. Any ideas?
> 
> Any enlightenment will be appreciated.
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