Hello,

I am working on a video tcp/ip project and am having problems with the pic
communicating with the modem.  Actually the modem isn't responding.  The
tx light on the modem does not indicate that it has received anything from
my PIC.  I am using the PIC17C44, with a NEWCOM external 33.6kbps modem.

I made an infinite loop (for test purposes) to send one character in
ascii, such as the letter 'a'.  With a scope I viewed the output on the
DB25 and everything is fine.  BTW, I have an RS232A chip between the PIC
TX/RX and the modem TX/RX.  And of course I flipped the lines, so the TX
from the PIC goes to the RX of the modem and vice versa.  Also, does
anyone have the specs or datasheets for a NEWCOM modem?

Attached is the code I am trying to use.  The code attempts to dial a
stored number in the modem's NVRAM, with the command atds=0.  The bsf
command to PORTC are for testing purposes to see have far the program
executes.  And it gets stuck RECV_PAUSE near the end.


Thanks,
Donald

~~~~~~~~ Donald D'Alessandro ~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~ Fourth Year Electrical Engineering ~~~~~~~~~~~~
~~~~~~~~ Ryerson Polytechnic University ~~~~~~~~~~~~~~~~
~~~~~~~~ Toronto, Ontario ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~ Email: ddaless@ee.ryerson.ca ~~~~~~~~~~~~~~~~~~