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Modbus - Exception 0C

 
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delilcodes



Joined: 12 May 2021
Posts: 5

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Modbus - Exception 0C
PostPosted: Wed May 12, 2021 1:58 pm     Reply with quote

Hello all,

I am new at Modbus and trying to communicate on PIC processors via RS485. I have using Modbus library. When I started the Proteus simulation this exception returns. Only this exception returns when I choose a different selection.

This is project, i used

https://github.com/worrajak/PICmodbus

This is the catalogue. But i don't understand what's wrong?

https://modbus.org/docs/PI_MBUS_300.pdf

https://preview.redd.it/fkk632qk7jy61.png?width=902&format=png&auto=webp&s=d61d8f1336f578424de9bea0f7a12182361f0068

And this is my code: (Turn on the led)

master:
Code:
#include <master_led_yak.h>
#fuses HS, NOWDT
#use delay(clock=4M)
#define MODBUS_TYPE MODBUS_TYPE_MASTER
#define MODBUS_SERIAL_TYPE MODBUS_RTU     //use MODBUS_ASCII for ASCII mode
#define MODBUS_SERIAL_RX_BUFFER_SIZE 64
#define MODBUS_SERIAL_BAUD 2400
#use rs232(baud=9600, UART1, stream=PC, errors)
#define MODBUS_SERIAL_INT_SOURCE MODBUS_INT_EXT
#define MODBUS_SERIAL_TX_PIN PIN_B1   // Data transmit pin
#define MODBUS_SERIAL_RX_PIN PIN_B0   // Data receive pin
#define DEBUG_MSG(msg) fprintf(PC, msg)
#define DEBUG_DATA(msg,data) fprintf(PC, msg, data)



#include <modbus.c>
#define MODBUS_SLAVE_ADDRESS 0x80

int i;
int8 swap_bits(int8 c)
{
   return ((c&1)?128:0)|((c&2)?64:0)|((c&4)?32:0)|((c&8)?16:0)|((c&16)?8:0)
          |((c&32)?4:0)|((c&64)?2:0)|((c&128)?1:0);
}
void print_menu()
{
   DEBUG_MSG("\r\n1. ledi yak\r\n");
}
void turnOnLED(){
   DEBUG_MSG("LED YAKILACAK\r\n");
   if(!(modbus_write_single_coil(MODBUS_SLAVE_ADDRESS,1,TRUE))){
      DEBUG_MSG("data: ");
      for(i=0; i<(modbus_rx.len); ++i)
         DEBUG_DATA("%X",modbus_rx.data[i]);
      DEBUG_MSG("\r\n\r\n");
   }else{
      DEBUG_DATA("<-**Exception %X**->\r\n\r\n", modbus_rx.error);
   }
}
void display(char c){
   switch(c){
      case '1':
         turnOnLED();
         break;
   }
}
void main(){
   char c;
   DEBUG_MSG("\r\nInitializing...");
   modbus_init();
   DEBUG_MSG("...ready\r\n");
   
      do{
      print_menu();
      c = getc(PC);
      fprintf(PC,"\r\n");
      display(c);
   } while(TRUE);
   
}


slave:
Code:
#include <slave_led_yak.h>
#fuses HS,NOWDT
#use delay(clock=4M)
#use fast_io(d)
#define MODBUS_TYPE MODBUS_TYPE_SLAVE
#define MODBUS_SERIAL_TYPE MODBUS_RTU     //use MODBUS_ASCII for ASCII mode
#define MODBUS_SERIAL_RX_BUFFER_SIZE 64
#define MODBUS_SERIAL_BAUD 2400
#define MODBUS_SERIAL_TX_PIN PIN_B1   // Data transmit pin
#define MODBUS_SERIAL_RX_PIN PIN_B0   // Data receive pin
#include <modbus.c>
#define MODBUS_ADDRESS 0x80
/*This function may come in handy for you since MODBUS uses MSB first.*/
int8 swap_bits(int8 c)
{
   return ((c&1)?128:0)|((c&2)?64:0)|((c&4)?32:0)|((c&8)?16:0)|((c&16)?8:0)
          |((c&32)?4:0)|((c&64)?2:0)|((c&128)?1:0);
}
void main()
{
//!   char c;
   
   set_tris_d(0x00);
   
   int8 coils = 0x00;
   int16 event_count = 0;
   
   modbus_init();
   
   while(TRUE){
      output_d(coils);
      while(!modbus_kbhit());
      delay_us(50);
     
      if((modbus_rx.address == MODBUS_ADDRESS) || modbus_rx.address == 0){
         switch(modbus_rx.func){
            case FUNC_WRITE_SINGLE_COIL:      //write coil
                   if(modbus_rx.data[0] || modbus_rx.data[3] || modbus_rx.data[1] > 8)
                        modbus_exception_rsp(MODBUS_ADDRESS,modbus_rx.func,ILLEGAL_DATA_ADDRESS);
                   else if(modbus_rx.data[2] != 0xFF && modbus_rx.data[2] != 0x00)
                        modbus_exception_rsp(MODBUS_ADDRESS,modbus_rx.func,ILLEGAL_DATA_VALUE);
                   else
                   {
                        //coils are stored msb->lsb so we must use 7-address
                        if(modbus_rx.data[2] == 0xFF)
                            bit_set(coils,modbus_rx.data[1]);
                        else
                            bit_clear(coils,modbus_rx.data[1]);
                        modbus_write_single_coil_rsp(MODBUS_ADDRESS,modbus_rx.data[1],((int16)(modbus_rx.data[2]))<<8);
                        event_count++;
                   }
                   break;
         }
      }
   }
}


https://i.hizliresim.com/6f7tzsz.png
https://i.hizliresim.com/d920p52.png
The left one is slave modbus TX and nothing going on.
The upper right one is master rx-tx. My gui for turn on the led.
the bottom right one is slave modbus RX. The information received.

What should i do with this. Can you help me?
temtronic



Joined: 01 Jul 2010
Posts: 8181
Location: Greensville,Ontario

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PostPosted: Wed May 12, 2021 2:48 pm     Reply with quote

Quite understandable as it's a Proteus 'simulation'... please read PIC101 sticky...

When you get real hardware 'up and running', let me know....
Jay
dluu13



Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON

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PostPosted: Wed May 12, 2021 7:09 pm     Reply with quote

If you look at the github you posted, there are pictures there with a RS485 transceiver. I've also only ever used the modbus 485 library with the transceiver in there. I cannot be sure that without the transceiver, something is going wrong.
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