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how to read use the extend sms cmd

i want to use my vc software   to   read /write   the  battery   ,   now i can read the volt .etc.now the device in sealed mode  ,i want to read the opreation status  ,now i know must write the ManufacturerAccess  and  read the ManufacturerAccess,for example  ,read OperationStatus (0x54),please tell me  how  to  read  , first    write ManufacturerAccess ,what is write ?

( 0x00   byte1  byte2  )what is the byte1 and byte2.please  help me.  i searth "send 0x0041 to ManufacturerAccess  "in   web ,but not  find in   the  Technical Reference ,how to  get the  information .  Manual   thans