Hexabitz RS485 Controlling Schneider VFD

#define SlaveAdd2 2
#define cmdaddress 8501
#define frqaddress 8602
#define cfrqaddress 8604 

uint8_t	first_param;
uint16_t	second_param;
	
main()
{
  for(::)
  {
    shnider_vfd(first_param,second_param);
  }
}


extern void shnider_vfd(uint8_t cmd,uint16_t freq)
{


		switch(cmd){
		///////Writing speed
			case 1:


			freq=freq*30;
				WriteModbusRegister(SlaveAdd2,frqaddress, freq) ;
	

			break;

			//////////run motor
			case 2:


	  	WriteModbusRegister(SlaveAdd2,cmdaddress, 6);
	

			break;
			/////ready motor
			case 3:
				
				WriteModbusRegister(SlaveAdd2,cmdaddress, 7) ;

			break;
			/////start motor
			case 4:
				WriteModbusRegister(SlaveAdd2,cmdaddress, 15) ;

			break;
			
			
			default:
				
			ReadModbusRegister(SlaveAdd2,cfrqaddress,1, DataRcv);


			break;			
		}
}