Anybus Module Objects 116 (258)
Command Details: Receive
Category
Extended
Details
Command Code 15h
Valid for: Instance
Description
This command receives data from a connected socket. Message segmentation may be used to receive up to
1472 bytes (for more information, see Message Segmentation, p. 123).
For SOCK-DGRAM-sockets, the module will return the requested amount of data from the next received da-
tagram. If the datagram is smaller than requested, the entire datagram will be returned in the response mes-
sage. If the datagram is larger than requested, the excess bytes will be discarded.
For SOCK_STREAM-sockets, the module will return the requested number of bytes from the received data
stream. If the actual data size is less than requested, all available data will be returned.
NON-BLOCKING mode: If no data is available on the socket, the error code 0006h (EWOULDBLOCK) will be returned.
BLOCKING mode: The module will not issue a response until the operation has finished.
If the module responds successfully with 0 (zero) bytes of data, it means that the host has closed the connec-
tion. The send channel may however still be valid and must be closed using Shutdown and/or Delete.
• Command Details
Field Contents Comments
CmdExt[0] (reserved) (set to zero)
CmdExt[1] Segmentation Control bits For more information, see Message Segmentation, p.
123
Data[0] Receive data size (low) Only used in the first segment
Data[1] Receive data size (high)
• Response Details
The data in the response may be segmented (For more information, see Message Segmentation, p.
123).
Field Contents Comments
CmdExt[0] (reserved) (set to zero)
CmdExt[1] Segmentation Control bits For more information, see Message Segmentation, p.
123
Data[0...n] Received data
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Anybus
®
CompactCom
™
40 PROFINET IRT Network Guide SCM-1202-023 EN 1.8
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