Read Data - Omron V640-HAM11-V3 User Manual

SECTION 4
Reading from/Writing to ID Tags

• Read Data

S18,F5
L,3
• 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.
ID Tag Memory Maps
S18,F6
L,4
• When the specified target is invalid:
DATA item length = 0, s = 0, SSACK = "CE" communications error
• In an address specification, if:
(SEGMENT + DATALENGTH) ≤ total value for all segments then SSACK = "NO"
• In an address specification, if:
(SEGMENT + 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.
CIDRW System
78
User's Manual
Read Request
1.<TARGETID>
2.<DATASEG>
3.<DATALENGTH>
Refer to page 151.
Read Data
1.<TARGETID>
2.<SSACK>
3.<DATA>
4.L,s
1.<STATUS1>
⋅
s.<STATUSs>
S,H→E,reply
"01"-"31"
S,H→E,reply
"01"-"31"