RS232 help

Archiver

Hello,

I am having some trouble with an rs232 connection. I am kind of new to
this stuff, so I'm probably making a stupid mistake.

Anyhow, in this part of my project, I am connecting a pocket pc to a
external serial modem using a casio connector and a DB25 connector. I
wired up all of the connections per casio's specs, but I can't get the
modem to work.

When I power on both items, the modem's RD SD TR & CS lights come on.
However, when I try to send a dial string the TR light goes out, but it
doesn't dial, it just sits there until the connection times out then
gives me an error message at which point the TR light comes back on.

Would anybody be able to point me at which connection may be messed up
to make it do this? I have the TXD wired to the RXD and vice versa. Is
this correct or do I have them reversed?

Thanks a lot!!
-Ben

Archiver

Ben,

Does it respond OK if you just type "at"?

/Douglas
--- In basicstamps@y..., <bens@e...> wrote:
> Hello,
>
> I am having some trouble with an rs232 connection. I am kind of
new to
> this stuff, so I'm probably making a stupid mistake.
>
> Anyhow, in this part of my project, I am connecting a pocket pc to
a
> external serial modem using a casio connector and a DB25
connector. I
> wired up all of the connections per casio's specs, but I can't get
the
> modem to work.
>
> When I power on both items, the modem's RD SD TR & CS lights come
on.
> However, when I try to send a dial string the TR light goes out,
but it
> doesn't dial, it just sits there until the connection times out
then
> gives me an error message at which point the TR light comes back
on.
>
> Would anybody be able to point me at which connection may be
messed up
> to make it do this? I have the TXD wired to the RXD and vice
versa. Is
> this correct or do I have them reversed?
>
> Thanks a lot!!
> -Ben

Archiver

At 09:56 AM 11/29/02 +0000, you wrote:
>Ben,
>
>Does it respond OK if you just type "at"?
>
>/Douglas

Douglas -

For some modems you need to use ALL CAPS.

Bruce