Max 232 / Mobile Phone

Archiver

Hope someone can help. I am currently trying to get my stamp BS2
to talk to my mobile phone. I am running into a few problems. I
have written some code to output some AT command to a pin for serial
transfer to the phone. The phone does not recognise the signal which
works fine when I copy the output to a hyperterminal session and send
to the phone manually. I assume this was due to the phone wanting
232 voltages.

So to get past this I decided to run the output from the serial
pin through a Max 232 chip. I wired this up on a breadboard as per
the diagram in issue 89 of Nuts n' Volts. I get an output from the
chip but it shows up as jibberish (random characters) on a
hyperterminal session. Thinking that the characters were
just 'shifted' on the ascii map I tryed just sending 5 1's (ie
11111). It showed up as completly different characters.

This sounds like some sort of timing issue to me. Can anyone offer
me some help ?

Thanks in advance.
Mitch

Archiver

you may be seeing RF interference from the phone. Breadboard circuits are
quite often useless when dealing with RF.

jim
http://www.geocities.com/jimforkin2003/

---

Original Message

---

From: mknight73 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=0WrA8eolVEA3Vk8-qS4nctCwYXgTKcDC2bNAK4CNGKFLsPNHu5PiVGiNiYmEbQI-6nE1_sYffc8-Ydpv9A]mknight73@y...[/url
Sent: Monday, June 16, 2003 8:08 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Max 232 / Mobile Phone


Hope someone can help. I am currently trying to get my stamp BS2
to talk to my mobile phone. I am running into a few problems. I
have written some code to output some AT command to a pin for serial
transfer to the phone. The phone does not recognise the signal which
works fine when I copy the output to a hyperterminal session and send
to the phone manually. I assume this was due to the phone wanting
232 voltages.

So to get past this I decided to run the output from the serial
pin through a Max 232 chip. I wired this up on a breadboard as per
the diagram in issue 89 of Nuts n' Volts. I get an output from the
chip but it shows up as jibberish (random characters) on a
hyperterminal session. Thinking that the characters were
just 'shifted' on the ascii map I tryed just sending 5 1's (ie
11111). It showed up as completly different characters.

This sounds like some sort of timing issue to me. Can anyone offer
me some help ?

Thanks in advance.
Mitch


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Archiver

Also, when you put a 232 driver into the circuit,
you need to set the 'Invert' mode on the baudrate.

--- In basicstamps@yahoogroups.com, "mknight73" <mknight73@y...>
wrote:
> Hope someone can help. I am currently trying to get my stamp
BS2
> to talk to my mobile phone. I am running into a few problems. I
> have written some code to output some AT command to a pin for
serial
> transfer to the phone. The phone does not recognise the signal
which
> works fine when I copy the output to a hyperterminal session and
send
> to the phone manually. I assume this was due to the phone wanting
> 232 voltages.
>
> So to get past this I decided to run the output from the serial
> pin through a Max 232 chip. I wired this up on a breadboard as per
> the diagram in issue 89 of Nuts n' Volts. I get an output from the
> chip but it shows up as jibberish (random characters) on a
> hyperterminal session. Thinking that the characters were
> just 'shifted' on the ascii map I tryed just sending 5 1's (ie
> 11111). It showed up as completly different characters.
>
> This sounds like some sort of timing issue to me. Can anyone offer
> me some help ?
>
> Thanks in advance.
> Mitch

Archiver

Thanks for your help. The invert worked first time. I have only
got one step further. The phone will still not react to the AT
commands.

If I copy the commands to a hyperterminal session the phone reacts,
if I use the stamp, no response.

I have tried bridging pins (of the D9 plug) 1-4-6 and 7-8 to no
success.

Has anybody successfully communicated with a mobile phone from a
stamp ? What is the difference between the stamp and pc ? Do I
need to try RTS/CTS ?

I am using a Nokia 6210 with data cable.

Thanks again.



--- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
wrote:
> Also, when you put a 232 driver into the circuit,
> you need to set the 'Invert' mode on the baudrate.
>
> --- In basicstamps@yahoogroups.com, "mknight73" <mknight73@y...>
> wrote:
> > Hope someone can help. I am currently trying to get my stamp
> BS2
> > to talk to my mobile phone. I am running into a few problems.
I
> > have written some code to output some AT command to a pin for
> serial
> > transfer to the phone. The phone does not recognise the signal
> which
> > works fine when I copy the output to a hyperterminal session and
> send
> > to the phone manually. I assume this was due to the phone
wanting
> > 232 voltages.
> >
> > So to get past this I decided to run the output from the
serial
> > pin through a Max 232 chip. I wired this up on a breadboard as
per
> > the diagram in issue 89 of Nuts n' Volts. I get an output from
the
> > chip but it shows up as jibberish (random characters) on a
> > hyperterminal session. Thinking that the characters were
> > just 'shifted' on the ascii map I tryed just sending 5 1's (ie
> > 11111). It showed up as completly different characters.
> >
> > This sounds like some sort of timing issue to me. Can anyone
offer
> > me some help ?
> >
> > Thanks in advance.
> > Mitch

Archiver

I am working from memory, but I'm pretty sure I'm right

If Nokia still use the same method as they did for the 5110 then you
are being tricked.

The nokia software creates a virtual com port on the computer that you
can access with programs such as hyperterminal but in fact it is
speaking a nokia binary format out the physical com port.

So unless you know the binary protocol your sunk.

There was however a group that was striving to overcome this, try;

www.gnokii.org

Perhaps they can help

Regards

Rohan

---

Original Message

---

From: "mknight73" <mknight73@y...>
Date: Tuesday, June 17, 2003 6:51 am
Subject: [noparse][[/noparse]basicstamps] Re: Max 232 / Mobile Phone

> Thanks for your help. The invert worked first time. I have only
> got one step further. The phone will still not react to the AT
> commands.
>
> If I copy the commands to a hyperterminal session the phone
> reacts,
> if I use the stamp, no response.
>
> I have tried bridging pins (of the D9 plug) 1-4-6 and 7-8 to no
> success.
>
> Has anybody successfully communicated with a mobile phone from a
> stamp ? What is the difference between the stamp and pc ? Do I
> need to try RTS/CTS ?
>
> I am using a Nokia 6210 with data cable.
>
> Thanks again.
>
>
>
> --- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
> wrote:
> > Also, when you put a 232 driver into the circuit,
> > you need to set the 'Invert' mode on the baudrate.
> >
> > --- In basicstamps@yahoogroups.com, "mknight73" <mknight73@y...>
> > wrote:
> > > Hope someone can help. I am currently trying to get my
> stamp
> > BS2
> > > to talk to my mobile phone. I am running into a few problems.
>
> I
> > > have written some code to output some AT command to a pin for
> > serial
> > > transfer to the phone. The phone does not recognise the
> signal
> > which
> > > works fine when I copy the output to a hyperterminal session
> and
> > send
> > > to the phone manually. I assume this was due to the phone
> wanting
> > > 232 voltages.
> > >
> > > So to get past this I decided to run the output from the
> serial
> > > pin through a Max 232 chip. I wired this up on a breadboard
> as
> per
> > > the diagram in issue 89 of Nuts n' Volts. I get an output
> from
> the
> > > chip but it shows up as jibberish (random characters) on a
> > > hyperterminal session. Thinking that the characters were
> > > just 'shifted' on the ascii map I tryed just sending 5 1's (ie
> > > 11111). It showed up as completly different characters.
> > >
> > > This sounds like some sort of timing issue to me. Can anyone
> offer
> > > me some help ?
> > >
> > > Thanks in advance.
> > > Mitch
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
>

Archiver

I'm trying to do the very same thing, but it seems with a little more
success, though not much!
I have my bs2p connected to the nokia 6310i with data cable, and
when I send the 'AT' command, I can get the 'OK' reply (using the WAIT
(OK)) in the serin command.
I also copied a lot from Nuts&Volts 89, look at 60 also.
I'm trying to send a SMS message from the stamp, but I get problems
at the send stage. I get OK from the phone at each stage up to this
though. I followed the commands in the Nokia AT command guide.
I used flow control with serin, but not with serout (wouldn't work).
At this stage I'm wondering if I need to connect more than just TX,
RX, RTS, CTS, maybe the data cable gets power from the PC (stamp)
side?
I want to use the phone as a modem eventually, because it has its own
battery backup!
If you'd like the code I've got so far, let me know, perhaps we can
figure this out between us.

Darren.


--- In basicstamps@yahoogroups.com, "mknight73" <mknight73@y...>
wrote:
> Hope someone can help. I am currently trying to get my stamp
BS2
> to talk to my mobile phone. I am running into a few problems. I
> have written some code to output some AT command to a pin for
serial
> transfer to the phone. The phone does not recognise the signal
which
> works fine when I copy the output to a hyperterminal session and
send
> to the phone manually. I assume this was due to the phone wanting
> 232 voltages.
>
> So to get past this I decided to run the output from the serial
> pin through a Max 232 chip. I wired this up on a breadboard as per
> the diagram in issue 89 of Nuts n' Volts. I get an output from the
> chip but it shows up as jibberish (random characters) on a
> hyperterminal session. Thinking that the characters were
> just 'shifted' on the ascii map I tryed just sending 5 1's (ie
> 11111). It showed up as completly different characters.
>
> This sounds like some sort of timing issue to me. Can anyone offer
> me some help ?
>
> Thanks in advance.
> Mitch

Archiver

Darren, I'm trying to do almost exactly the same as you using a Sony
Ericsson mobile phone as a modem, but haven't had any success. I want
the Stamp to download received SMS messages from the phone (then do
other cool things with them, but that part is already resolved) using
the AT command set provided by Sony Ericsson. I know I can connect to
and download from the phone using hyperterminal but it doesn't seem
to work to use the same settings with the Stamp. Are you using the
I/O pins or the programming pin? I also wonder whether it's a voltage
issue. Since my phone runs on 3 volts I assumed that it wouldn't need
for a 12-volt RS 232 signal.
Germaine

--- In basicstamps@yahoogroups.com, "poguemomhoin"
<darren.gallagher@o...> wrote:
> I'm trying to do the very same thing, but it seems with a little
more
> success, though not much!
> I have my bs2p connected to the nokia 6310i with data cable, and
> when I send the 'AT' command, I can get the 'OK' reply (using the
WAIT
> (OK)) in the serin command.
> I also copied a lot from Nuts&Volts 89, look at 60 also.
> I'm trying to send a SMS message from the stamp, but I get problems
> at the send stage. I get OK from the phone at each stage up to this
> though. I followed the commands in the Nokia AT command guide.
> I used flow control with serin, but not with serout (wouldn't work).
> At this stage I'm wondering if I need to connect more than just TX,
> RX, RTS, CTS, maybe the data cable gets power from the PC (stamp)
> side?
> I want to use the phone as a modem eventually, because it has its
own
> battery backup!
> If you'd like the code I've got so far, let me know, perhaps we can
> figure this out between us.
>
> Darren.
>
>
> --- In basicstamps@yahoogroups.com, "mknight73" <mknight73@y...>
> wrote:
> > Hope someone can help. I am currently trying to get my stamp
> BS2
> > to talk to my mobile phone. I am running into a few problems. I
> > have written some code to output some AT command to a pin for
> serial
> > transfer to the phone. The phone does not recognise the signal
> which
> > works fine when I copy the output to a hyperterminal session and
> send
> > to the phone manually. I assume this was due to the phone
wanting
> > 232 voltages.
> >
> > So to get past this I decided to run the output from the
serial
> > pin through a Max 232 chip. I wired this up on a breadboard as
per
> > the diagram in issue 89 of Nuts n' Volts. I get an output from
the
> > chip but it shows up as jibberish (random characters) on a
> > hyperterminal session. Thinking that the characters were
> > just 'shifted' on the ascii map I tryed just sending 5 1's (ie
> > 11111). It showed up as completly different characters.
> >
> > This sounds like some sort of timing issue to me. Can anyone
offer
> > me some help ?
> >
> > Thanks in advance.
> > Mitch