File content as of revision 0:84c281baac9c:

  #include "mbed.h" 
  #include <RS485.h>
  Serial pc(USBTX, USBRX); 
  RS485 RS485(p13,p14,p15); // Tx, Rx , !RE and DE MAX485 pin
 
  DigitalOut ho(p15); // this pin should be connected to !RE and DE
  typedef uint8_t byte;
 
  byte regvalue[9];
  //byte data[9] = {0x01,0x04,0x00,0x48,0x00,0x02,0xf1,0xdd};//your data
  byte data[9] = {0x02,0x05,0x01,0x49,0x01,0x03,0xf2,0xde};//your data
  int main()
  {
    pc.baud(115200);   
    pc.printf("main\n");
    while(1) {
       pc.printf("Starting\n");
       ho = 1;                  // Enable sending on MAX485
       RS485.sendMsg(data,sizeof(data));
       wait_ms(600);            // Must wait for all the data to be sent   
       ho = 0;                  // Enable receiving on MAX485
       pc.printf("Getting data\n");
       if(RS485.readable() >0){
           memset(regvalue,0,sizeof(regvalue));
           wait_ms(200);
           RS485.recvMsg(regvalue,sizeof(data),500);
           wait_ms(200);
           for (int count = 0; count < 9; count++) {
               pc.printf("%X - ", regvalue[count]);
           }
       }else printf("No Data\n");
       printf("Done\n");
       wait_ms(1000);
    }
  }