Omron V780 Series, User Manual

Page: 102 / 398

6 Functions
6 - 26 UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
The Gen2 session setting determines the length of time to hold the status of the RF Tag. The
Reader/Writer communicates with an RF Tag and then sets a flag in the RF Tag after communica-
tions to indicate that it has been processed. The timing for retaining this flag depends on the ses-
sion. We recommend that you normally use the default setting of S0.
Precautions for Correct Use
If you specify a stop time in the transmission time settings and then stop the output during RF
Tag communications, you cannot use session S0 for multiaccess communications. If you spec-
ify S0 anyway, results may be returned more than once for the same RF Tag. (When the output
is stopped, the status in the RF Tag is reset, so the “already processed” status is cleared.)
You must specify the access password (8 hexadecimal digits) to the Reader/Writer to execute com-
munications commands for an RF Tag with a locked memory area. If you attempt to execute a com-
munications command without specifying the access password, a password error will occur.
• If the access password area in the memory of the RF Tag is not all zeros, the memory will be
locked.
• If the UII (EPC) area, TID area, user area, or access password area in the memory of the RF Tag
is locked, you must specify the access password to use write communications commands for the
locked area.
• If the access password area in the memory of the RF Tag is locked, you must specify the access
password to use a communications command (DATA READ) to read the area.
Gen2 Session
Setting Description Default
S0 The status of the flag is not retained after power to the RF Tag is
turned OFF.
Use this setting to always process communications for each com-
mand for all RF Tags that are in the communications range. S0
S1 The status of the flag is retained for 500 ms to 5 s regardless of
whether the power supply to the RF Tag is turned ON or OFF.
Use this setting to process communications at a set interval for the
same RF Tags when a communications command is repeatedly
executed.
S2/S3 The status of the flag is retained for at least 2 s after power to the
RF Tag is turned OFF.
Use either of these settings to process communications only once
when each RF Tag first enters the communications range when a
communications command is repeatedly executed.
Access Password
Setting Description Default
All zeros An access password is not set.
Access password verification is not required to communi-
cate with the RF Tag. 00000000 hex (Not set.)
Not all zeros (any
value) An access password is set.
Access password verification is required to communicate
with the RF Tag.