Siemens TC35

[pedja089]

Try to connect easypic to serial port, and hyper terminal. Then you can see does pic send "AT", and will receive OK.

[aratti]

Does your easypic4 have a RS232 level converter (Max232) prior connecting it to the Siemens TC35 ? If not then you will need one.

Cheers

Al.

[savnik]

Yes, have max232.

[pedja089]

Check the configuration switches and jumpers

[savnik]

Check the configuration switches and jumpers

I have check many times.

[aratti]

In this case, check your connection Tx from your pic should go to pin 3 of your TC35 while your pic Rx should go to pin 2 of TC35 and pin 5 of TC35 should be connected to ground of your pic board.

Cheers

Al.

Edited: HSEROUT ["AT" ,13] use only CR, remove LF from your code.

[savnik]

I have use this circuit.
If i connect to hyper terminal all works fine, but if i connect to pic don't work.

[savnik]

I have use this circuit.
If i connect to hyper terminal all works fine, but if i connect to pic don't work.

Why if i connect the DB9 connector to pc (hyper terminal) with rs232 cable all work?

[aratti]

If you have modified the Max232 to DB9 as per my previous post then you pic board now is a DTE device, and to connect to the PC, which is a DTE device you need to cross pin 2 with pin 3 in the connecting cable. Once you have a crossed cable you can check your board and program functionality using hyperterminal to send the "OK" once you receive the "AT" from the board. If this works and the TC35 works with hyperterminal it should work also with your pic board.

Remember that your TC35 is a DCE device and a DCE device is connected to DTE device with a cable pin to pin. Since you are very likely working without handshaking then you need only three connections on the DB9 (pin 2; pin 3 and pin 5)

Al.

Edited:
I looked once again to the picture you have posted and I noted on the left side a note "TO THE TC35". This is wrong. Pin 11 and pin 12 of Max232 must be connected to the pic, while Max pin 14 goes to DB9 pin 3 and max pin 13 goes to DB9 pin 2. This DB9 connector is the one you will use to connect your TC35