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Response Segmentation
When a response is segmented, the command initiator requests the next segment by sending the same com-
mand multiple times. For each response, the data field is exchanged with the next data segment.
Response segmentation is used for responses to the following commands (Socket Interface Object specific
commands):
•
Receive
•
Receive From
When receiving a segmented response, the following rules apply:
•
In the first segment, FS is set.
•
In all subsequent segment, both FS and LS are cleared.
•
In the last segment, LS is set.
•
For single segment responses (i.e. size less or equal to the message channel size), both FS and LS are
set.
•
The command initiator may at any time abort the operation by issuing a message with AB set.
Segmentation Control bits (Command)
Bit
Contents
Meaning
0
(reserved)
(set to zero)
1
2
AB
Set if the segmentation shall be aborted
3...7
(reserved)
Set to 0 (zero)
Segmentation Control bits (Response)
Bit
Contents
Meaning
0
FS
Set if the current segment is the first segment
1
LS
Set if the current segment is the last segment
2...7
(reserved)
Set to 0 (zero)
Anybus
®
CompactCom
™
40 EtherCAT
®
Network Guide
SCM-1202-034 1.1