![Anybus CompactCom 40 Common Ethernet Скачать руководство пользователя страница 76](http://html1.mh-extra.com/html/anybus/compactcom-40-common-ethernet/compactcom-40-common-ethernet_design-manual_2948756076.webp)
74 (104)
Command Details: Receive_From
Category
Extended
Details
Command Code
16h
Valid for:
Instance
Description
This command receives data from an unconnected SOCK_DGRAM-socket. Message segmentation may be
used to receive up to 1472 bytes (For more information, see
The module will return the requested amount of data from the next received datagram. If the datagram is
smaller than requested, the entire datagram will be returned in the response message. If the datagram is larg-
er than requested, the excess bytes will be discarded.
The response message contains the IP address and port number of the sender.
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.
•
Command Details
Field
Contents
Comments
CmdExt[0]
(reserved)
(set to zero)
CmdExt[1]
Segmentation Control bits
For more information, see
Data[0]
Receive data size (low byte)
Only used in the first segment
Data[1]
Receive data size (high byte)
•
Response Details
The data in the response may be segmented (For more information, see
).
Field
Contents
Comments
CmdExt[0]
(reserved)
(set to zero)
CmdExt[1]
Segmentation Control bits
For more information, see
Data[0]
Host IP address byte 4
The host address/port information is only included in the
first segment. All data thereafter will start at Data[0]
Data[1]
Host IP address byte 3
Data[2]
Host IP address byte 2
Data[3]
Host IP address byte 1
Data[4]
Host port number (low byte)
Data[5]
Host port number (high byte)
Data[6...n]
Received data
Anybus
®
CompactCom
™
40 Common Ethernet Design Guide
HMSI-27–269 2.1