4-1 Operation of Reader/Writer
4-1
4-3
4-1-2 Online Mode
Communication with Tags (2) is performed according to the command (1) from the connected
host. The result is returned to the host as a response (3). The I/O can be read or controlled
using commands. The input can be used as a command execution trigger, and the output can be
used as a result-based control signal for peripherals. Some outputs are exclusively used for
antenna control, depending on the settings.
●
Command Standby State
The Command Standby State is where the Reader/Writer is not processing but can accept any
command other than AK or NK, which are used for ACK/NACK control. When the Reader/Writer
accepts a command, it enters the command processing state.
●
Command Processing State
When a command is accepted, other commands are ignored until the accepted command has been
processed. However, the Stop (ST) and Reset (XZ) Commands are always accepted. When a command
that performs continuous processing is executed, the processing state continues until completed or
stopped.
The COMM LED is lit (flashed) while communication with the Tags is in progress.
The Reader/Writer enters a special command processing state in the following situations, although it is
not actually communicating with the Tags. The COMM LED is not lit in these cases.
・
After the commands have been executed in FIFO trigger or FIFO auto mode
FIFO continuation state where the antenna oscillates continuously: Only the FIFO access
commands are accepted.
・
After the Tag Detection Command has been executed (I.CODE1 Mode only).
）
Selective state where the simplified numbers of Tags are stored, only the Tag specification
commands are accepted.
●
Normal/abnormal completion of command processes
The NORM LED is turned on when the command from the host has been completed normally, and
ERROR LED is turned on if the command has been completed abnormally, for a short period of time at
the returning of the response.
■
LED/Output state in each operating status
LED state
Output
Operation state
RUN
COMM
NORM
ERROR
OUT1
Command standby
○
●
●
●
(command)*
1
Processing with Tags
○
○
●
●
−
Normal completion of command processing
○
●／○
*2
○
●
−
Abnormal completion of command processing
○
●／○
*2
●
○
−
○
: ON,
●
:OFF, : Flashing ,
−
: Unchanged
*1 Specified by I/O Control Command (CC.)
*2 Stays lit (flashed) when the communication with Tags is continued.
Reader/writer
Antenna
Tag
（
1) Command
(2)
Communication
Radio communication
between antenna and tag.
Multipurpose
input
(3) Response
Host device (PC)
Multipurpose output
(antenna control output)
