Siemens TC35

[savnik]

Check that pic pin 18 is connected to Max pin 12 and pic pin 19 is connected to max pin 11.

Since it seems you have a wired PCB then very likely you are unable to change the DB9 connection, so cross the serial cable

Al.

The pin 18 is connected to Max pin 11 and pic pin 19 is connected to max pin 12.
When connect the DB9 connection with hyperterminal and with those :
at
OK
at+creg?
+CREG: 0,1

OK
at+cmgf=1
OK
at+cmgs=xxxxxxxxxx
> hello my friend
+CMGS: 4

work very well.
When i connect to DB9 connection the pic don't work. I connect the pin 2,3,5 with pic pin 25,26 and ground (normal and cross)

[savnik]

I have code for AVR and for C8051 , but i don't know c language.

[aratti]

I connect the pin 2,3,5 with pic pin 25,26 and ground (normal and cross)

Post which pic you are using. You must have a Max 232 in between your pic and your TC35.

The max232 you have internally the TC35 is for converting the internal TTL to rs232. You will need an additional Max232 for reconverting the RS232 to TTL for your pic. See my last schematic for connection from your pic to TC35 DB9

Al.

[savnik]

Post which pic you are using. You must have a Max 232 in between your pic and your TC35.

The max232 you have internally the TC35 is for converting the internal TTL to rs232. You will need an additional Max232 for reconverting the RS232 to TTL for your pic. See my last schematic for connection from your pic to TC35 DB9

Al.

I use a pic16f877a.
I will try again the max232 on easypic4 (i have test already with no success).
Thank you for the help.