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RS232 error

 
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young



Joined: 24 Jun 2004
Posts: 285

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RS232 error
PostPosted: Tue Sep 07, 2004 3:15 pm     Reply with quote
When I am using RS232 to transfer message, error button on CCW serial port monitor light up, and ON the screen 'X' signal appeared, which according to my program should be 'a', awhat might caused this problem.

I used a RS232 convertor between a 12f675 and the computer, I sued the same system for a long time without anything happened. I just moved the set up to another breadboard. and I checked carefully everything is kept as original. here is my testing program

Code:
#if defined(__PCM__)
#include <12f675.h>
#fuses INTRC_IO,NOWDT,NOPROTECT,PUT,NOMCLR
#use delay(clock=4000000)
#use rs232(baud=9600, parity=N, xmit=PIN_A4, RCV=PIN_A3)


void main()
{
   int8 mode; //lighting condition grabbing set
   int16 i;
  setup_comparator(NC_NC_NC_NC);
  while(1) {
  char ch=' ';
  while(ch!='a')
  {
  ch=getc();
  output_high(PIN_A0);
  delay_ms(100);
  putc(ch);
    }
 output_high(PIN_A1);
 delay_ms(100);

//  mode=1;
//  while(mode)
//    {
//       mode=input_A() & 0x08;
//    }
  //  for(i=0;i<255;i++)
 //     produce_pwm(i);
 //   putc(getc()+1);

  }
}
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Tue Sep 07, 2004 5:26 pm     Reply with quote
Well if nothing changed except that you rewired the circuit, then that is where the problem most likely is.
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