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PICList Thread
'[OT]: SMSing and I am missing something'
2001\10\16@173954 by Peter May

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Well I have played, read, played and........

This is what I have came up with so far....

I have found info around the net that suggest that you can talk to a mobile
phone using PDU or TEXT. There is a way of telling the phone which is being
used. However if I use a terminal package (tried Hyperterminal,CRT, etc etc
etc plus a few more) I don't seem to get a response as in an error or
anything I would call usuable info. The only time I seem to get a response
is if I turn the phone on and off whilst plugged in????  However if I
download a SMS or phone manager type software I can communicate and control
the phone using the same cable.

In the PDU format info someone provided it said it was a 7 bit format. Does
that mean I should set the port to 7 bit and one stop bit or that is no
where near the ball park.

So what am I mising. I know the communication is carried to the phone via a
serial cable so therefore I reckon the PIC should do the same and will keep
at it but geeeeeeeees it is $#*^%% me off (fill in you own word). How does
the phone know the cable is there? Do I have to use flow control.

Fill me please. Regards, Peter.

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2001\10\17@040843 by Bond, Peter

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> ...The only time I seem to
> get a response
> is if I turn the phone on and off whilst plugged in????  However if I
> download a SMS or phone manager type software I can
> communicate and control
> the phone using the same cable.

My old Timeport had to be powered down before being controlled by the cable,
AFAIR.  Never managed to get an answer from handsets on why it was needed.

So it may be a feature...

Peter
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2001\10\17@044020 by Ian Chapman

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Peter May <.....managerKILLspamspam@spam@SALE-NET.COM.AU> wrote:
>However if I use a terminal package (tried Hyperterminal,CRT, etc etc
>etc plus a few more) I don't seem to get a response as in an error or
>anything I would call usuable info.

You need to use "AT" commands (like with a PSTN modem) to talk to the
mobile.  Any other lines of input text that don't start with an AT will
probably be ignored.  Try typing AT and pressing <return> (or <enter>) -
you should see an OK response.

If you don't get this response then one possibility is that your serial
port parameters are not set up correctly.  Try setting Hyperterminal up
for 8 data bits, no parity bits and 1 stop bit.  Sometimes, the mobile
detects the baud rate automatically (try sending a couple of <return>
characters at the start).  If this doesn't work, then start by setting
Hyperterminal for 9600 bps and work up through the speeds (19200 bps,
28800 bps, 38400 bps, 57600 bps etc.) until you find the correct one.

It is also possible but unlikely that a lower baud rate or a different
format has been set - check the menus on your mobile to see if there is a
configuration option for these.

>I have found info around the net that suggest that you can talk to a mobile
>phone using PDU or TEXT. There is a way of telling the phone which is being
>used.

The relevant command is AT+CMGF=0 for PDU mode or AT+CMGF=1 for text mode.
You can check the current setting using an AT+CMGF? command.

A complete list of SMS commands can be found in the standards document GSM
07.05 which is available from the ETSI Web site at http://www.etsi.org

>In the PDU format info someone provided it said it was a 7 bit format. Does
>that mean I should set the port to 7 bit and one stop bit or that is no
>where near the ball park.

You will probably find text mode simpler to use to start with.  In this
mode, you can send an SMS by entering AT+CMGS="<destination number>" and
pressing <return>, which should respond with a '>' prompt.  At this point,
you can type your text message.  To send the message, type a <control-Z>
character (or if you have made a mistake, send an <escape> character to
abort).  The mobile should respond with an OK message.

Note that the destination number does need to be enclosed in double quote
marks as shown above, and can be in "world" format (e.g. "+44" prefix for
the UK).

I hope this gets you started!
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Ian Chapman
Chapmip Technology, UK

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