4-1
Section
Controller
53
The following diagram shows the basic connections in a 1:N system.
Host device
220-
Ω
termination
connected
RS-485 Controller 0
220-
Ω
termination
not connected
RS-485 Controller 1
220-
Ω
termination
not connected
RS-485 Controller 30
220-
Ω
termination
connected
Set up the host device’s processing to confirm that a response has been re-
ceived from the Controller before sending the next command.
When an RS-232C/RS-485 Adapter is being used at the host device, send the
command only when transmission is allowed. Furthermore, switch the host de-
vice to allow reception within 20 ms after the command is sent. The host may not
be able to communicate with the Controller if the host is not able to receive within
20 ms.
Host device
Controller
Command frame
Response frame
Command frame
20 ms
1:N RS-485 Connections
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