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3. Operations of the R/W Module
3.1 Outline of operations
The R/W Module receives commands from the User board, executes read / write
processes on the Tag, and returns a response of the results of the process to the
User board. The status of the R/W Module operations will be reflected on the Output
/ LED.
n
Operations Timing Chart
Status
Initial
process
Waiting for
command
Receiving
command
Processing
command
Transmitting
response
Waiting
command
TXD
Command
RXD
Response
Tag
communi-
cations
COMM
↓
NORM
↓
ERR
↓
RUN
↓
3.2 Oscillation Control
The R/W Module supplies power to the Tag by oscillating the antenna, and thus
conducts communication with the Tag. The Module may be set on either the
“Oscillate Mode” “Stop Mode” depending on whether the Module should oscillate
while not in communication with the Tag. The “Stop Mode” conserves dissipation
power, and enables the R/W Module antenna to be installed close to the Tag to
conduct communications on a time sharing basis. The “Oscillate Mode” allows the
Module to constantly supply power to the Tag for FIFO processing.
Oscillation Status
Operation
Mode Switching Conditions
Stop Mode (conserves
dissipation power)
The antenna stops
oscillating while not
processing commands
•
Mode switching conditions at
start-up
•
When oscillation OFF
command is active
Oscillation Mode
(enables high-speed
processing)
The antenna is
constantly oscillating
•
When oscillation ON command
is active
•
When option is active in FIFO
Trigger / FIFO Auto Command
Out-
put /
LED
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Page n
User CPU
R/W Module
Tag
User Board
