Omron V700-HMD13 series - Page 54

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Section 4
4.4 Message specifications
V700-L21
User's Manual
Section 4
SECS Protocol Specifications
S18,F5 Read request S,H→E,reply
L,3
1.<TARGETID> "01"-"31"
2.<DATASEG>
3.<DATALENGTH>
• 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 a DATALENGTH that exceeds the maximum allowable
length of that DATASEG.
• If DATALENGTH whose length is shorter than DATASEG is specified, the data corresponding with that DATALENGTH only is read.
S18,F6 Read data S,H←E
L,4
1.<TARGETID> "01"-"31"
2.<SSACK>
3.<DATA>
4.L,s
1.<STATUS1>
.
s.<STATUSs>
• When the specified target is invalid:
DATA item length=0, s=0, SSACK = CE (communications error)
• When an undefined DATASEG is specified, or DATALENGTH is illegal:
DATA item length=0, s=0, SSACK = CE (communications error)
• When reading of all segment data is instructed for a system whose data segments have not yet been defined:
DATA length=0, SSACK = NO
• When SSACK is other than NO (normal), the List of Status will take a list structure with which the number of items is 0.