AbortIO() 
     BeginIO() 
     CloseDevice() 
     CMD_CLEAR 
     CMD_FLUSH 
     CMD_READ 
     CMD_RESET 
     CMD_START 
     CMD_STOP 
     CMD_WRITE 
     OpenDevice() 
     SDCMD_BREAK 
     SDCMD_QUERY 
     SDCMD_SETPARAMS