C_IGI_NA_3

General interrogation.

- obj

 

 

 

 

ASDU object

|---

+ head

 

 

 

Reserved

|---

- ident

 

 

 

DATA UNIT IDENTIFIER

|

|---

eType

= 0x7 (7)

= C_IGI_NA_3

Type identification

|

|---

bSQ

 

= TRUE

Sequence of information objects

|

|---

nObj

 

= 1

Number of objects

|

|---

eCOT

 

 

Cause of transmission

|

|---

asduAddr

 

 

Common address of asdu

|

|---

eClass

 

 

Fifo priority class

|---

- info

 

 

 

INFORMATION OBJECT

 

|---

fc

 

:= GLB

Function code/type

 

|---

n

 

 

Information number

 

|---

stream

 

 

Information element/object data

 

 

|---

length

= 1

 

 

 

|---

data

 

7

6

5

4

3

2

1

0

 

 

 

 

|---

data[0] =

SCN

Scan number

 

 

 

|---

data[1..IEC870_MAX_ASDU_DATA_BYTE] =

 

Reserved