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SECTION 4
When SECS Is Used
CIDRW System
User’s Manual
SECTION 4
Reading from/Writing to ID Tags
• Read Data
ID Tag Memory Maps Refer to page 159.
S18,F5 Read Request S,H → E,reply
L,3
1.<TARGETID> "01"-"31"
2.<DATASEG>
3.<DATALENGTH>
• When DATASEG is specified as "0" and a character string, the size of data determined by the DATALENGTH setting is read,
starting from the address indicated by the DATASEG setting. If DATALENGTH = 0, data is read up to the end of the data
area.
• If DATASEG is specified as a character string, a size of data determined by DATALENGTH, starting from the address speci-
fied by DATASEG, is read (segment specification).
• When the data of all segments is batch read, both DATASEG and DATALENGTH are omitted (they are zero length items).
• When all the data for a particular segment is read, DATALENGTH is omitted (it is a zero length item).
• In a segment specification, it is not possible to specify a DATALENGTH that exceeds the maximum length of the relevant
DATASEG.
• In a segment specification, if a DATALENGTH that is under the set length for DATASEG is specified, only the data corre-
sponding to specified DATALENGTH is read.
S18,F6 Read Data S,H
→
E,reply
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
• In an address specification, if:
(S DATALENGTH) ≤ total value for all segments then SSACK = "NO"
• In an address specification, if:
(S DATALENGTH) > total value for all segments then DATA item length = 0, s = 0, SSACK = "CE" communica-
tions error
• In a segment specification, if an undefined DATASEG is specified, or if the DATALENGTH is illegal:
DATA item length = 0, s = 0, SSACK = "CE" communications error
• When reading of all segment data is specified in a system where the data segment is not defined:
DATA length = 0, SSACK = "NO"
• If the status of SSACK is other than "NO" (normal), the List of Status will comprise zero items.