User's Manual

4-4 Specification of Communication Mode

A communication mode optimum for object motion according to the intended application is selected. The

specification of the communication mode is represented by ASCII digits.

Transmission operation No. Description

Trigger ‘0’ When the host puts object movement under control, a command is issued

after ensuring that the tag is present before Model 4S2VR-V720-KR11

.

Immediately after receiving the command, the Kanban reader

4S2VR-V720-KR11  communicates with the tag and sends a response.

If the tag is not present, a tag absence error is transmitted. After

sending the response, the reader stands by for a new command. It is

essential that one tag is present in the communication area.

Auto ‘1’ When the host puts object motion under control mostly, and if a

command has been issued in advance when the tag is approaching the

Kanban reader 4S2VR-V720-KR11 , transmission is made when the

tag comes into the communication area.

After completing the transmission and sending a response, the reader

stands by for a new command. When it receives a command and is

waiting for the tag, the T/R lights up. When a stop command is

received, the command is cancelled and the T/R goes out. It is essential

that one tag is present in the communication area.

Continue ‘A’ Even when the host is not controlling object movement at all, if a

command has been received in advance, the reader makes a

communication with the tag waiting for the tag to come into the

communication area. Reading can be executed in synchronization with

objects using the EXT input of the I/O of 4S2VR-V720-KR11

. Even

when the host cannot keep synchronization, the reader

4S2VR-V720-KR11  as a local control can keep synchronization.

In this case, if an error occurs as the result of communication, it is

reflected on the response.

In the continue mode, too, reading by keeping synchronization via the

reader 4S2VR-V720-KR11  is recommended because it will be easier

to recover from an error status.

Caution!

As a rule, reading and writing operation of Kanban information by the reader should be performed for one Kanban.

If communication is executed when more than one Kanban is present within the communication area, a

communication is made with any one of tags or no communication is made, causing a tag absence error and

resulting in incorrect information collection.