User's Manual

23
Chapter 4 Functions
4-1 Procedure of Communication and Outline of Operation
HOST KR11
Command
Response
V720 series tag
When the host issues a command to Model 4S2VR-V720-KR11 , Model 4S2VR-V720-KR11  communicates
with the tag according to the command and returns a response to the host.
A command specifies: 1) page of the tag to be accessed "Specification of Access Page (4-3)"
2) communication procedure to be used "Specification of Communication mode (4-4)"
3) what to do "Specification of Command (4-5)"
As a response, the result of execution of the command added with a message of an exit code is returned to the host
"Exit Code (4-7) ".
As a result of communication of 4S2VR-V720-KR11
 with the tag, the OK or NG LED display lights up for
about 1 second. In addition, the host can present its judgment such as judgment on checking of read data by
flashing the LED display on the terminal, Model 4S2VR-V720-KR11 , for about 2 seconds (See the diagram
below).
Data exchange between the host and Model 4S2VR-V720-KR11  is executed smoothly by exchanging status
information with each other. "Response Status of Command (4-6)"
(In case that KR11 makes a judgment and displays it)
HOST
KR11
(OK display)
1S
(NG display)
(OK output)
(NG output)
(In case that reading is OK and the host displays its judgment based on the read data)
HOST
KR11
(OK display)
(NG display)
(OK output)
(NG output)
Command Response
Continued light-up
Flashing for 2 seconds (0.2/0.2s)
In case of OK
In case of NG
Execution of communication
Command Response
Judgment
(OK output)
(NG output)
Execution of communication