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Is some wrong with my schematic ?

 
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helmi03



Joined: 12 Apr 2011
Posts: 7

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Is some wrong with my schematic ?
PostPosted: Sat Apr 16, 2011 11:26 am     Reply with quote
Hi, I just want to do a simple connection between pc and rs232.

I'm using 2 virtual port RS232 and a terminal.

When I send data to the pic, the pic answer with no data .

http://img821.imageshack.us/i/shema.png/

My code is :
Code:

#include <16F877.h>
#device *=16
#fuses HS, NOWDT, NOLVP, NOBROWNOUT, NOPROTECT, PUT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,errors, stream=PC)

//int i=2;

int8 msg[40];
//int8 next_in=0;

void main() {
 
    //set_tris_a(0x00);

while(1) {

msg[0]=fgetc();
fputc(msg[0]);
}

}
temtronic



Joined: 01 Jul 2010
Posts: 9243
Location: Greensville,Ontario

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PostPosted: Sat Apr 16, 2011 5:01 pm     Reply with quote
Why not use the examples that CCS supplies in the examples folder ?
SherpaDoug



Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA

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PostPosted: Sat Apr 16, 2011 8:07 pm     Reply with quote
I don't think the MAX232 pin #2 should be grounded. That is the voltage doubled +V and grounding it will kill the + and - charge pumps. It should have a cap to ground. See the MAX232 datasheet.
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surfer0815



Joined: 10 Sep 2010
Posts: 7
Location: Germany

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PostPosted: Sun Apr 17, 2011 3:16 am     Reply with quote
HI! Ground pin 5 on your com Connector, and change Pin 2 and 3 of Com connector, It looks like your schema is wrong.
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