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'[PIC:] Anybody using Siemens MC35 and PIC ?'
2004\03\07@225203 by Jinx

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Mostly working OK but having an inconsistency problem. I'm
using AT+CMGL to read the engine but don't always get a
properly formatted response back. What I was expecting to
receive is truncated and the rest padded out witth what looks
like garbage

If anyone has experience setting these up for SMS in text mode
and have them working properly I'd like to hear from them

TIA

==============================================
Research is what I'm doing when I don't know what I'm doing
- Wernher von Braun

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2004\03\17@061132 by egnascimento

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face
what is the exact command that you are sending to MC35?
You are working in Text or PDU mode?


--
Eduardo Garcia

{Original Message removed}

2004\03\17@064733 by Jinx

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> what is the exact command that you are sending to MC35?

The sequence I'm using is at

http://home.clear.net.nz/pages/joecolquitt/mc35.html

> You are working in Text or PDU mode?

Text

The problem is that there isn't always a concluding OK coming
from the MC35. The diagram at the above address shows the
OK included on the top memory dump, and OK missing in the
memory dump below that. And it appears the MC35 just sends
garbage instead of terminating the message properly as it does
in the top example

Everything else I've tried seeems to be working OK (sending SMS
from the MC35 to a cellphone or e-mail address for example). Part
of the problem is that there are so many parameters for commands
in the AT Manual and I'm fairly ignorant of what they all do. The lack
of examples and very technicalese descriptions don't help. It's been
on hold for a few days and I did plan to look up a user group

The problem with CMGL hasn't manifested itself (yet) using Hyper-
terminal and the same set-up commands, which is puzzling. Electrically
the PIC+MAX232 and the PC are quite close. I've looked at the data
stream with an oscilloscope and logic analyser but can'[t detect any
kind of breakdown. The MC35 itself seems to be the source of the bad
data

If you can see anything wrong or missing I'd be grateful for any advice

thanks

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2004\03\17@160656 by Brent Brown

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Any joy from Siemens NZ? I can send you contact details off list. They are
supposed to have very good tech support (they say so) and at least should
be able to send your well defined problem to someone who really knows.

--
Brent Brown, Electronic Design Solutions
16 English Street, Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/txt: 025 334 069
eMail:  spam_OUTbrent.brownTakeThisOuTspamclear.net.nz

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2004\03\17@221358 by Peter Mcalpine

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face
Hi,
If it is working ok in hyperterminal then I would suggest you
have a problem in the PIC. I don't know how you are doing
the rs232 receive routine but would start looking there. I
suspect you are missing characters.

A good idea is to set aside a RAM buffer to use for rs232 rx
and all the rs232 rx interrupt does it put the character in it.
Then in a main loop keep checking the last character in for
a delimiter ie in this case should be a carriage return, then
process the info in the buffer.

Hope that is of some help.

Cheers,
Peter Mcalpine

{Original Message removed}

2004\03\18@081435 by Jinx

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> If it is working ok in hyperterminal then I would suggest you
> have a problem in the PIC. I don't know how you are doing
> the rs232 receive routine but would start looking there. I
> suspect you are missing characters.

Well, I've scoped it and analysed it many times. Characters
are not lost in transit, they just aren't being sent. It'll work maybe
3 or 4 times, then the next run, with a seemingly identical set-up,
it doesn't work

> A good idea is to set aside a RAM buffer to use for rs232 rx
> and all the rs232 rx interrupt does it put the character in it.

That's what is already being done (note - where the memory
dumps come from), and actually how the complete project has
to work anyway

> Then in a main loop keep checking the last character in for
> a delimiter ie in this case should be a carriage return, then
> process the info in the buffer.

If you look at the memory dump, you'll see it's full of CR and LF,
which are not delimiters. The "OK" is the delimiter, and that's
what goes missing

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'[PIC:] Anybody using Siemens MC35 and PIC ?'
2004\07\06@064639 by Jinx
face picon face
An update on my problems back in March. We eventually gave
up on the MC35 cellular engine. More bugs than a Mack's
windscreen. Many emails bewteen Siemens offices all over
the place accomplished nothing. Then we changed to the much
cheaper Fargo Maestro 20 GSM/GPRS Modem and haven't
looked back. It works perfectly with exactly the same commands
that the MC35 choked on, and hasn't missed a beat in 3 months
of intensive prototyping. So, a wee plug for Fargo

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2004\07\06@070543 by Russell McMahon

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>  ... We eventually gave up on the MC35 cellular engine ...

> Then we changed to the much cheaper Fargo Maestro 20
> GSM/GPRS Modem and haven't
> looked back. It works perfectly with exactly the same commands
> that the MC35 choked on, and hasn't missed a beat in 3 months

I hope you have, politely, conveyed this latest information to Siemens.

       RM

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2004\07\06@072032 by Jinx

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> I hope you have, politely, conveyed this latest information to Siemens.

I expressed to Siemens, politely, promise, my frustration with the
MC35. It had been pointed out to me, belatedly, that their range
had a number of errors that migrated though the series. Some
were fixed, some new ones appeared. Akin to Microchip's dodgy
silicon episodes. What really stopped me enjoying the work was
the uncertainty of when the next "anomoly" would appear and how
to work around it. It's hard enough debugging a lot of code without
having to factor in that the firmware might be at fault

My client was less than happy, and I left it to him to confront his
supplier. Although he is pleased with current progress, even
though there's some furious catching up to do

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