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PICList Thread
'PIC17C44'
2000\03\09@214914 by Donald D'Alessandro

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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: spam_OUTddalessTakeThisOuTspamee.ryerson.ca ~~~~~~~~~~~~~~~~~~

2000\03\10@185431 by Donald D'Alessandro

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part 0 1562 bytes content-type:TEXT/PLAIN; charset=US-ASCII; name="temp.asm"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: .....ddalessKILLspamspam@spam@ee.ryerson.ca ~~~~~~~~~~~~~~~~~~

Content-Type: TEXT/PLAIN; charset=US-ASCII; name="temp.asm"
Content-ID: <Pine.GSO.4.10.10003101852200.14775@tank>
Content-Description: temp.asm
Content-Disposition: attachment; filename="temp.asm"

Attachment converted: birth:temp.asm (TEXT/CSOm) (000077A0)

2000\03\10@191958 by Rich Leggitt

picon face
> 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
Do you have DTR, RTS, etc. asserted correctly?

2000\03\10@221003 by Donald D'Alessandro

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I did but then removed them.  Maybe you can tell me if I had done
so correctly. I had the RTS shorted with the CTS, and the DTR shorted with
the DSR.  And the modem light indicating 'terminal ready' was on.

Should this haved worked?  Because it didn't.  And I have tried the modem
(which is new) a few times on a computer and everything is fine.

Thanks,
Donald

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

~~~~~~~~ Email: ddalessspamKILLspamee.ryerson.ca ~~~~~~~~~~~~~~~~~~

On Fri, 10 Mar 2000, Rich Leggitt wrote:

> > 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
> Do you have DTR, RTS, etc. asserted correctly?
>

2000\03\10@224359 by Rich Leggitt

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Try using DSR to drive both DTR and RTS...

On Fri, 10 Mar 2000, Donald D'Alessandro wrote:

{Quote hidden}

2000\03\11@181147 by Donald D'Alessandro

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Thanks for your advice.  However, it didn't work for me.  I know my pic is
definitely working.  I looped the tx to the rx at the db25 connecter and
my pic sees itself transmitting.  But when I connect my modem, it still
doesn't respond.

Another other ideas would be greatly appreciated.

Thank you,
Donald

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

~~~~~~~~ Email: KILLspamddalessKILLspamspamee.ryerson.ca ~~~~~~~~~~~~~~~~~~

On Fri, 10 Mar 2000, Rich Leggitt wrote:

{Quote hidden}

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