ABB FCAN-01, Руководство пользователя

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126 Communication protocol
Read Service (SDO Upload)

Initiate SDO Upload Protocol
This protocol is used to implement the Initiate SDO Upload service.
ccs Client command specifier; ccs = 2: Initiates the upload request.
scs Server command specifier; scs = 2: Initiates the upload
response.
n Number of data bytes (in d) which do not contain data. Bytes
[8-n, 7] do not contain segment data. Valid only if e = 1 and s =
1 (otherwise n = 0).
e Transfer type; e = 0: Normal transfer. e = 1: Expedited transfer.
s Size indicator; s = 0: No data set size indication.
s = 1: Data set size indication.
m Multiplexor; represents the index/subindex of the data to be
transferred by the SDO.
d Data; e = 0, s = 0: Reserved for further use.
e = 0, s = 1: Contains the number of bytes to be uploaded.
Byte 4 contains the LSB and byte 7 contains the MSB.
e = 1, s = 1: Contains the data of length 4-n to be uploaded.
Encoding depends on the type of the data referenced by index
and subindex.
e = 1, s = 0: Contains unspecified number of bytes to be
uploaded.
x Not used. Value is always 0.
Reserved Reserved for further use. Value is always 0.
Client Initiate SDO Upload Protocol
Request
Confirm
Server
Indication
Response
4...0
x
7...5
ccs = 2
7...5
scs = 2
4
x 3...2
n
1
e
0
s
0 1 4 8
0 1 4 8
Reserved
m
m d