Nokia GSM phones and 159 Char SMS

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Anonymous - 28 Feb 2004 11:32 GMT

Greetings,

I am sending SMS messages via AT commands programmatically.
I am using Text mode (AT+CMGF=1) and have discovered that the Nokia Card
Phone and 6210 only seem to accept 159 characters + ctrl z after the >
prompt. If I output 160, I get ERROR returned.

I have tried the same on a WaveCom Fasttrack modem and it accepts 160 chars
just fine.

Can anyone shed some light on this one. It seems odd since the Nokia AT
command manual states Nokia devices (as per the ETSI standard) accepts 160.

Any help appreciated.

Regs,

-J.

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John Henderson - 28 Feb 2004 19:42 GMT

> I am sending SMS messages via AT commands programmatically.
> I am using Text mode (AT+CMGF=1) and have discovered that the
[quoted text clipped - 8 lines]
> Nokia AT command manual states Nokia devices (as per the ETSI
> standard) accepts 160.

When you send your AT commands to the phone, how are you
terminating them?

The correct termination is a single <carriage return> character,
char(13), WITHOUT a <linefeed>. Many devices will tolerate a
<carriage return><linefeed> 2-character sequence. This is the
usual end-of-line sequence you'd use with peripheral devices.

If you're using

AT+CMGS=<da><carriage return><linefeed>

I wouldn't be surprised to see the Nokias counting the <linefeed>
as a character to be sent.

John

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Anonymous - 29 Feb 2004 22:09 GMT

Thanks for your response.

All sent commands are terminated with <cr>

Indeed after reading your comments I reviewed my code and discovered that
the sending function I created actually terminated the expected SMS text
stream with <ctrl-z><cr>
Reviewing the ETSI spec I discovered this should not be done, the sms
message text should only be terminated with <ctrl-z>
It seems the WaveCom modem ignored this extra character while the Nokia
complained.
Anyway, a quick code adjustment and all is now OK.

Regs,

-J.

> > I am sending SMS messages via AT commands programmatically.
> > I am using Text mode (AT+CMGF=1) and have discovered that the
[quoted text clipped - 25 lines]
>
> John

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