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.
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.
All progress began with an idea
The pin 18 is connected to Max pin 11 and pic pin 19 is connected to max pin 12.Originally Posted by aratti
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)
I have code for AVR and for C8051 , but i don't know c language.
Last edited by savnik; - 4th December 2010 at 20:18.
Post which pic you are using. You must have a Max 232 in between your pic and your TC35.I connect the pin 2,3,5 with pic pin 25,26 and ground (normal and cross)
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.
All progress began with an idea
I use a pic16f877a.
I will try again the max232 on easypic4 (i have test already with no success).
Thank you for the help.
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