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Page 28 of 153 TR-EMO-BA-GB-0022 v03 09/29/2020
Write services, Client --> Server
● Initiate SDO Download
The Initiate SDO Download service is used for an individual transmission of
data, if the number of bytes can be accepted by the mailbox, or if a
segmented transmission is to be started with more bytes.
● Download SDO Segment
The SDO Download Segment service is used to transfer the additional data
that could not be transferred with the Initiate SDO Download service. The
master starts as many Download SDO Segment services as are required
to transfer all data to the server.
Read services, Server --> Client
● Initiate SDO Upload
The Initiate SDO Upload service is used for an individual transmission of
data, if the number of bytes can be accepted by the mailbox, or if a
segmented transmission is to be started with more bytes. The server
responds with the result of the upload request and the required data, in the
event of successful execution.
● Upload SDO Segment
The SDO Upload Segment service is used to transfer the additional data
that could not be transferred with the Initiate SDO Upload service
response. The server starts as many Upload SDO Segment services as
are required to transfer all data from the server.
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