Data Transmission by Accessing Layer 2 Services S5-95U, SINEC L2
Figure 8-7. Structure of Requests, Confirmations and Indications for the SDA Service
Request
com_class
FDL_Request=00
H
Byte
a
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0
Confirmation
com_class
Confirmation=01
H
Byte
a
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a
a
0
a
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a
a
a
a
1 user_id
ID assigned in connection with
a request
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a
a
a
1
Indication
com_class
Indication=02
H
Byte
a
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a
a
0
a
a
a
a
1
irrelevant
user_id
User-definable ID
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8
.
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249
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a
4 Bits 0 to 3
0
rem_add_station
Address of the destination
station (1 to 126)
a
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a
5 Destination SAP 0 to 62,
FF (=default SAP 64)
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6
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a
7 rem_add_segment
Logical segment address;
always enter FF
H
Bits 4 to 7
service_class
Priority of
send message
low=0
H
or
high=1
H
Send data
(0 to 242 bytes)
service_code
Type of service:
SDA=00
H
a
a
a
a
a
a
2
link_status
( Table 8-5 )
a
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3
a
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a
4
Destination SAP 0 to 62,
FF (=default SAP 64)
rem_add_station
Address of the destination
station (1 to 126)
a
a
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a
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a
5
a
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a
a
6
a
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a
a
a
a
7 rem_add_segment
Logical segment address;
is always FF
H
Bits 0 to 3
0
Bits 4 to 7
service_class
Priority of the
send message
low=0
H
or
high=1
H
service_code
Type of service requested
SDA=00
H
a
a
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a
2
a
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a
3
irrelevant
service_code
Type of service:
SDA=00
H
a
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a
a
2
irrelevant
a
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a
3
a
a
a
a
4
Source SAP 0 to 62,
FF (=default SAP 64)
rem_add_station
Address of source station
(1 to 126)
a
a
a
a
5
a
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a
a
6
a
a
a
a
7 rem_add_segment
Logical segment address;
is always FF
H
Bits 0 to 3
0
Bits 4 to 7
service_class
priority of
receive frame
low=0
H
or
high=1
H
Receive data
(0 to 242 bytes)
a
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8
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249
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Must be specified by the user in the request header
8-16
EWA 4NEB 812 6112-02
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