IEC 60870-5-101 asdu object reference

M_ME_TF_1

Measured value, short floating point value with CP56Time2a time tag.

- obj         ASDU object
   |--- + head       Reserved
   |--- - ident       DATA UNIT IDENTIFIER
   |    |--- eType = 0x24 (36) = M_ME_TF_1 Type identification
   |    |--- bSQ   = FALSE Sequence of information objects
   |    |--- nObj   = 1 Number of objects
   |    |--- bT     Test
   |    |--- bPN     Positive/negative confirmation/activation
   |    |--- eCOT     Cause of transmission
   |    |--- nORG     Originator address
   |    |--- asduAddr     Common address of asdu
   |    |--- eClass     Fifo priority class
   |--- - info       INFORMATION OBJECT
     |--- objAddr     Information object address
     |--- stream     Information element/object data
         |--- length = 12  
         |--- data   7 6 5 4 3 2 1 0  
         |--- data[0..3] = R32 Short floating point value
         |--- data[4] = IV NT SB BL 0 0 0 OV QDS = Quality descriptor
         |--- data[5..11] = CP56Time2a Seven octets binary time tag
         |--- data[12..IEC870_MAX_ASDU_DATA_BYTE] =   Reserved