Pic to GSM Phone connection (HSerin problems)

[Ioannis]

On the above code:

HSerin 5000,loop,[wait("UNREAD"),skip 3,STR Caller\13,skip 4,STR GSMTime\17,skip 6, STR GSMBUFFER\16\13]

it would be good to change UNREAD to READ since the phone can answer also "REC READ" or other "READ" messages.

Ioannis

[kasamiko]

On the above code:

HSerin 5000,loop,[wait("UNREAD"),skip 3,STR Caller\13,skip 4,STR GSMTime\17,skip 6, STR GSMBUFFER\16\13]

it would be good to change UNREAD to READ since the phone can answer also "REC READ" or other "READ" messages.

Ioannis

What is the purposed of this code modification? and in what particular above code?
Thanks

[NavMicroSystems]

kasamiko,

see comments

As I was interrested in "NEW" Messages only (the ones I had not already taken action on) "UNREAD" was correct.

[aruran]

It seems though everybody are ignoring my problem. Please take a minute to help me.

thanks
aruran

[NavMicroSystems]

It seems though everybody are ignoring my problem...

Have you yet asked yourself why?

...Please take a minute to help me.

Have you taken some time to read this thread from the beginning and checked the links posted here ?

[aruran]

Hi NavMicroSystems

My aim is to send SMS using a Nokia 7250i phone using a PIC microcontroller most probably 16F877A, since

it has hardware USART

I went through entire thread from page 1 to 2. The problems I faced can be listed as follows


1) I am a beginner so the schematic Stu746 told, had me in some dilema
I thought only modifications to be done are to omit the PC part with two MAx232 ICs

2) I have a Nokia 7250i : which has an embedded modem as I learnt from Nokia website - Solved
But I have a DAU 9P-FBSU cable which I use to connect my phone with other third party

softwares and it is successful. But using Hyperterminal it is not responing to any AT commands. Do I

need an DLR 3P cable. How can I do it with my DAU 9P FBUS cable...?

3) To my knowledge phone voltages are between 3.6 and 5V so why we need a MAX232 IC to connect

the phone to a PIC. We may need it in case we are connecting it to PC COM port. where voltages are

between +15 and -15V. This contradicted with the NavMicrosystems post on 24th February 2004, 22:05

Unless of course you are using the phone datacable inbetween !.

For your reference I have attached the circuit I built.

regards
aruran

[NavMicroSystems]

aruran,

I'm sorry, but I really can't tell which cable to use with the 7250i.

For my tests I used a 6210 with a standard (NoName) Data cable.

All I can tell is:
If your Phone doesn't respond to AT-commands sent from Hyperterm there is most likely something wrong with your cable.
I had two different cables, one did work, the second one didn't. I haven't taken the time to investigate in detail what the difference between them was.

To find out which cable works with your particular phone (or how to build your own) I guess you will have a better chance on one of the many GSM-Forums.