Omron V600 Series User Manual page 77

Using the AUTO READ and AUTO WRITE Commands
The READ and WRITE commands are normally used when Data Carriers are stopped.
The Auto Commands are normally used when Data Carriers are moving.
● READ or WRITE Command
Read/Write Head
• A much wider communica-
tions area can be used to
ensure dependable communi-
cations in comparison with
moving Data Carriers.
Data Carrier
Stopped
● Command Application Examples.
Item Application method
The next Auto Command is
sent after receiving a
response.
Data Carrier
Sending com-
Read/Write Head
mands using
a timer
The next Auto Command is
sent when a trigger is
received after a response is
returned.
Trigger
Data Carrier
Read/Write Head
● AUTO READ or AUTO WRITE Command
• This method is applicable when
Data Carriers pass through the
communications area of the
Read/Write Head at fixed inter-
vals.
• It can also be used when a long
time elapses before next Data
Carrier arrives.
• Repeating the same communi-
cation with the same Data Car-
rier can be prevented if the
waiting time during which the
Data Carrier leaves the commu-
nications area elapses after the
end of the communication.
• For example, an Auto Com-
mand is transmitted after end of
processing for the previous pro-
cess has been confirmed.
Data Carrier
• The trigger must be input before
the next Data Carrier
Trigger approaches.
• When using Auto Commands,
Read/Write Head
the approach of Data Carriers
is automatically detected.
• If the Data Carriers are moving
slowly enough and positioning
is dependable enough, then
Data Carrier
there are few restrictions on
Moving
the communications distance.
Description
• Transportation speed
must be kept constant.
• This method is valid only
for systems where com-
munications are not per-
formed more than once
with same Data Carrier.
• Trigger processing is
necessary.
Section 5
Communications
Precautions
RFID System
75
Operation Manual