Pic to GSM Phone connection (HSerin problems)

[Ioannis]

Ralph is right about the serial kwnoledge Rufinus. I was about to say almost the same things. If you don't own the Serial Complete, do so as soon as possible. It will help you the most.

Now, about your phone, it is sure a problem of levels, no question about it. It is just that we cannot guess anything. You have to find data sheets and read them from A to Z. Then you sure find why it behaves like the way you describe.

Regards,
Ioannis

[Rufinus]

Well, S55/S65 suports only PDU, unfortunately


I will get the book, because this is not my last project related to this matter.

Regarding datasheets. It is quite a tricky one, to find a complete datasheet for the phone. Even service manual i managed to find in internet, has the stamp on it: "For internal use only". So it is pretty much of poking and trying here and there, or call it guessing, if you will. And if the models of the phone are relatively new..

[Ioannis]

OK. PDU is one thing. Some phone do support ASCII some do not.
That's why I choose modules like Telit or Wavecom for serious projects or Nokia for experimenting.

But EVERY phone should answer 'OK' if addressed by 'AT'.

Ioannis

[NavMicroSystems]

Ioannis is right.

There are two GSM-Terminals I can recommend:

SIEMENS TC35i Terminal

and the Telit Terminal Ioannis has already mentioned.