M_SP_NA_1

Single-point information without time tag.

- obj

 

 

 

 

ASDU object

   |---

+ head

 

 

 

Reserved

   |---

- ident

 

 

 

DATA UNIT IDENTIFIER

   |

   |---

eType

= 0x01 (1)

= M_SP_NA_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

= 1

 

   

 

   |---

data

 

7

6

5

4

3

2

1

0

 

 

 

 

   |---

data[0] =

IV

NT

SB

BL

0

0

0

SPI

SIQ = Single-point information with quality descriptor

 

 

 

   |---

data[1..IEC870_MAX_ASDU_DATA_BYTE] =

 

Reserved