53
V700-L21
User's Manual
Section 4
4.4 Message specifications
Section 4
SECS Protocol Specifications
S18,F7 Write data request S,H→E,reply
L,4
1.<TARGETID> "01"-"31"
2.<DATASEG>
3.<DATALENGTH>
4.<DATA>
• If all the data of all segments are requested as a block, both DATASEG and DATALENGTH must be zero length items.
• If all the data in a particular segment is requested, DATALENGTH alone is omitted (zero length item or zero).
• When specifying DATASEG and DATALENGTH, it is impossible to choose DATALENGTH that exceeds the maximum allowable
length of that DATASEG.
• When a DATALENGTH shorter than the preset length of DATASEG is specified, the data corresponding to that DATALENGTH is writ-
ten into a lower address.
• The DATALENGTH must coincide with the DATA item length.
• If both DATASEG and DATALENGTH are set to zero length items, the DATA length must coincide with the sum of all the segments.
S18,F8 Write data acknowledge S,H←E
L,3
1.<TARGETID> "01"-"31"
2.<SSACK>
3.L,s
1.<STATUS1>
.
s.<STATUSs>
• When the specified target is invalid:
s=0, SSACK = CE (communications error)
• When DATASEG or DATALENGTH is illegal:
s=0, SSACK = CE (communications error)
• When SSACK is other than NO (normal), the List of Status will take a list structure with which the number of items is 0.
To Next Page
Loading...
