File content as of revision 0:db474e15b188:

/* mbed software with debugger
 *
 * author : Mike van Doorn
 *
 */

#include "mbed.h"
#define slaveAdress     0xFF
#define functioncode    0x03

Serial pc(USBTX, USBRX);
Serial bus(PA_9,PA_10);
DigitalOut led1(LED1);
DigitalOut activateSN65(PA_8);
int Read(void); 

int main()
{
    int count = 0 ;
    int data = 0 ; 
    int buffer = 0 ;
    int value = 0 ;
    activateSN65 = 0 ;
    pc.baud(115200);
    wait(1);
    
    while(1)
    {
        if ( count == 10 )
        {
            count = 0 ;     
        }
        activateSN65 = 0 ;
        if(bus.readable())
        { 
            data = bus.getc();
            pc.putc(data);
            if ( data == 0x07 && buffer == 0) 
            {
               buffer = 1;    
            }
            else if ( data == 0x02 && buffer == 1)
            {
                buffer = 2; 
            } 
            else if ( buffer == 2 || buffer == 3 )
            {
               if ( buffer == 2 ) 
               {
                   value = data ;  
                   value = value << 8  ;
                   buffer = 3 ;
               }
               else
               {
                   value = value + data ;
                   //if ( value > 0 && value < 0xFFFF )
                   //{
                       buffer = 5 ; 
                   //}    
               }                      
            }
            else if ( buffer == 5 )
            {
                // crc check 
                buffer = 6 ;     
            }
            else if ( buffer == 6 )
            {
                // crc check 
                buffer = 7 ;    
            }    
            else 
            {
                buffer = 0 ;     
            }
              
        }
        if ( buffer == 7 )
        {
            if ( count < 5 )
            {
                led1 = !led1; 
                wait_ms(3);
                activateSN65 = 1 ; 
                //adress
                bus.putc(0x07);
                wait_us(900);
                //send function code
                bus.putc(0x02);
                wait_us(900);
                // Byte count
                bus.putc(0x01);
                wait_us(900); 
                //data
                bus.putc(0x01);
                wait_us(900);
                // crc check 
                bus.putc(0x60);
                wait_us(900);
                bus.putc(0xC0);
                buffer = 0 ; 
                wait_ms(2) ;
                activateSN65 = 0 ; 
                count++;
            }
            else 
            {
                led1 = !led1; 
                wait_ms(3);
                activateSN65 = 1 ; 
                //adress
                bus.putc(0x07);
                wait_us(900);
                //send function code
                bus.putc(0x02);
                wait_us(900);
                // Byte count
                bus.putc(0x02);
                wait_us(900); 
                //data
                bus.putc(0x02);
                wait_us(900);
                bus.putc(0x02);
                wait_us(900);
                // crc check 
                bus.putc(0xB1);
                wait_us(900);
                bus.putc(0x19);
                buffer = 0 ; 
                wait_ms(2) ;
                activateSN65 = 0 ; 
                count++;
            }
        }
            
    }

}