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SDO-Segment auslesen:
Abbildung 8.5: SDO-Segment auslesen
ccs
client command specifier
3 = read (upload) segment request
scs
server command specifier
0 = read (upload) segment response
t
toggle bit
Must alternate for each subsequent segment with t=0 for the first
segment. Equal for each pair of request and response.
c
more segments indicator
0 = more segments to be read (uploaded).
1 = no more segments to be read (uploaded).
seg-
data
Segment data
At most 7 byte of segment data.
n
Number of bytes that don’t
contain segment data
Bytes [8-
n;7] don’t contain segment
n = 0 if no segment size indicated
x
not used
always 0
reserved
reserved for further use, always 0
Tabelle 8.20: Erläuterung der in Abbildung 8.5 verwendeten Abkürzungen
Das erste Segment lesen:
600h+ID
8
60h
01100000b
ccs=3, t=0
00h
00h
00h
08h
00h
00h
00h
CAN-ID
DLC Command
Object L Object H Sub-
Index
Byte0
Byte1
Byte2
Byte3
Tabelle 8.21: Lesen des ersten Segmentes
Der Drehgeber antwortet mit dem ersten Datensegment:
580h+ID
8
00h
00000000b
scs=0, t=0,
n=0, c=0
data
data
data
data
data
data
data
CAN-ID
DLC Command
Object L Object H Sub-
Index
Byte0
Byte1
Byte2
Byte3
Tabelle 8.22: Antwort mit erstem Datensegment
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