// set RS485 for 8 bit and Timer 4 baud
//S0_SCON0  = SM_SCON0_REN  + SM_SCON0_SM2 + SM_SCON0_SM1 + SM_SCON0_SM0 ;
  S0_SCON0  = SM_SCON0_REN                 + SM_SCON0_SM1                ;