5-6
Reader/Writer Control Commands
5-6
5-49
5-6-1 Stop (ST)
Stop (ST) Stop command terminates Auto mode, Repeat mode, EAS check and other command
processings, as well as continued FIFO state after FIFO Access, or Select state after executing
Detection command, returning to the Reader/Writer to a stand-by status to wait for commands.
<Command Format>
STX
Node No.
Command
code
"ST"
ETX BCC
1 2
2 1
1
<Response Format>
STX Node
No.
Retry
flag
Command
code
"ST"
Response
code
"00"
ETX BCC
1 2 1 2
2 1
1
Response code
00: Normal completion
For other response codes, refer to 5-3-7Response Code List.
5-6-2 Reset (XZ)
Reset Command resets the Reader/Writer software. No response is returned for this command.
Other commands are rejected during the software reset process (approximately 2.5 seconds).
<Command Format>
STX
Node No.
Command
code
"XZ"
ETX BCC
1 2
2 1
1
5-6-3 ACK(AK)
This command is used during ACK/NACK control to inform the Reader/Writer that the host device
normally received a response from the Reader/Writer. There is no response if this command is used in
ACK/NACK control, but if the Reader/Writer is not waiting to receive ACK/NACK signals, an error will
occur when the command is received. Refer to SECTION 5-1-3 ACK/NACK Control for details.
<Command
Format>
STX
Node No.
Command
code
"AK"
ETX BCC
1 2
2 1
1
5-6-4 NACK(NK)
This command is used during ACK/NACK control to inform the Reader/Writer that the host device did not
normally receive a response from the Reader/Writer. When the Reader/Writer receives a NACK command,
the previous response is retried provided that the maximum number of retries (9) has not been exceeded.
If the Reader/Writer is not waiting to receive ACK/NACK signals, an error will occur when the
command is received. Refer to SECTION 5-1-3 ACK/NACK Control for details.
<Command Format>
STX
Node No.
Command
code
"NK"
ETX BCC
1 2
2 1
1