User's Manual

1-2 System Configuration
1-2
1-4
1-2-2 Example of 1-to-N System Configuration
The unit has a built-in RS-485 interface that enables multi-drop
connection of up to 31 Reader/Writer units per host such as a mainframe
or PLC.
The cable for RS-485 can be extended to a total maximum length of 300
meters.
RUN
COM
M
NOR
M
ERR
OR
Personal computer ＰＬＣ
Desktop
computer
Laptop
computer
V720-HS04
V720S-BC5D4A
RUN
COM
M
NOR
M
ERR
OR
V720-HS04
V720S-BC5D4A
RUN
COM
M
NOR
M
ERR
OR
V720-HS04
V720S-BC5D4A
RS-485
RS-485
RS-485
Host device
Container
Tag
RUN
COM
M
NOR
M
ERR
OR
Personal computer ＰＬＣ
Desktop
computer
Laptop
computer
V720-HS04
V720S-BC5D4A
RUN
COM
M
NOR
M
ERR
OR
V720-HS04
V720S-BC5D4A
RUN
COM
M
NOR
M
ERR
OR
V720-HS04
V720S-BC5D4A
RS-485
RS-485
RS-485
Host device
Container
Tag

Note:
In the configuration, where multiple Reader/Writers are connected via an RS-485 interface, the commands in a
Communication Mode by which responses are returned at the Tag’s entry into the communication area, such as
those in the Auto or Repeat Modes, cannot be executed simultaneously. The responses from the Reader/Writer will
collide, preventing the host from receiving them normally. Such commands must be executed from the Polling
Command, or by the time-shared processing performed by the host.
：The models shown in the diagram are for example purposes only