TC35i GSM With PIC 16F690 help

[financecatalyst]

Done it to 84, so now it is transmitting in True mode. NOW the code is entering gosub one as expected BUT not gosub two.
Changed the code to the following:
main:
gosub one
Serout2 tx,baud,["AT+CMGF=1",13]
Serin2 rx,baud,5000,main,[wait("OK"),i]
gosub two
goto main

As always code never enters label two which means it is not getting the required response. I attach my setup photo, though not very clear but the schematic is the same except the pin change to 10 & 12 instead of your 17 & 18.

[pedja089]

tc35i factory settings for bounrate is 2400 not 9600!
Becouse you use max its not inverted signal.
on 2400 and true settings should be 396 if you use 4mhz crystal.
here example of code how to star communication with modem if max232 is used:

 Init:
serout tx,0,["AT",13]
serin2 rx,396,1000,init,[WAIT("OK")]

[financecatalyst]

tc35i factory settings for bounrate is 2400 not 9600!
Becouse you use max its not inverted signal.
on 2400 and true settings should be 396 if you use 4mhz crystal.
here example of code how to star communication with modem if max232 is used:

 Init:
serout tx,0,["AT",13]
serin2 rx,396,1000,init,[WAIT("OK")]

Tried you way as well. I am using internal oscillator and I put it to 4MHz this time. After that I tried your instructions above but results are the same. Two questions I want to ask you
First: Why have you used "0" in the instruction serout tx,0,...
Second: why have you not used serout2 and used just serout & serin2 instead of serin?

[aratti]

tc35i factory settings for bounrate is 2400 not 9600!

TC35i is autobauding from 4.8Kbps to 115Kbps. 2400 bauds setting will not activate the auto-function.

Al.

[aratti]

I think you need to check your modem with hyperterminal to check if it works correctly. If your computer doesn't have a serial port, you can obtain a serial to USB converter (check if compatible with your operating system)

Al.

[financecatalyst]

I think you need to check your modem with hyperterminal to check if it works correctly. If your computer doesn't have a serial port, you can obtain a serial to USB converter (check if compatible with your operating system)

Al.

I will try that hopefully tomm, and will post my findings. Thank you all for your help upto now.

[financecatalyst]

By the way, can someone tell me the expected voltages across 232 pins and modem Rx & Tx pin. I just have a funny feeling that problem is with the hardware part instead of software.

[mackrackit]

I am using internal oscillator and I put it to 4MHz this time.

The internal OSC most often is NOT accurate enough for communications. Try an external.

Look at post #5 for the expected voltage levels.

[aratti]

baud con 84 ' baud rate = 9600 Inverted
Rx var Portb.7 ' Declaring rx pin
Tx var Portb.5 ' Declaring tx pin

Change your code as per the above, then it should work.

Edited:
Remember to allow the modem to settle after powerup, before start serial communication (See modem led blink)
Al.

[financecatalyst]

baud con 84 ' baud rate = 9600 Inverted
Rx var Portb.7 ' Declaring rx pin
Tx var Portb.5 ' Declaring tx pin

Change your code as per the above, then it should work.

Al.

No Luck still. In the datasheet, portb.5 is Rx & portb.7 is Tx! Why you advised to mark it the other way. Though it's still not working.
Also 9600 Inverted is NOT 84 (just looked into the PBP manual) it is 16468
Program is the same as above (With your modifications) i.e. Baud 84 & ports interchanged.