Furuno FELCOM 12 Service Manual page 35

SES Signalling Channel Packet Types
Packet
1 Acknowledgement
2 Announcement Response
3 Assignment Response
4 Clear
5 Data Report
6 Distress Alert
7 Distress Alert Test
8 MES Forced Clear
9 Login Request
10 Logout Request
11 Message Status Request
12 Test Request
13 Test Result Acknowledgement
14 Transfer Status Request
15 Assignment Request
8 7 6 5 4 3 2 1
Type 1
P C
Logical Channel No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Check sum
15
1. Acknowledgement
Figure 2-4 Signalling Channel Packet Formats
Destination
LES
LES
LES
LES
NCS & LES
NCS & LES
LES
NCS & LES
NCS
NCS
NCS & LES
NCS
LES
NCS & LES
NCS & LES
8 7 6 5 4 3 2 1
Type 1
P C
MES ID
Logical Channel No.
Packets
Check sum
FILL
15
3. Assignment Response
8 7 6 5 4 3 2 1
Type 1
P C
MES ID
LES ID
Position
Nature
P
Course
Speed
DA PA CU
Check sum
15
6. Distress Alert
2-4
Note) P: Priority (Distress,
Normal)
C: Continuation (Last
packet in sequence,
Another packet to follow)
Type:Packet type
Logical Channel No.:
Communication
Channel
8 7 6 5 4 3 2 1
Type 1
P C
MES ID
LES ID
Service Depend Descriptor
Destination
Descriptor
Check sum
15
15. Assignment Request
8 7 6 5 4 3 2 1
Type 1
P C
MES ID
Class
Version Number
Check sum
FILL
15
9. Login Request
8 7 6 5 4 3 2 1
Type 1
P C
MES ID
Check sum
FILL
15
10. Logout Request