114
Connecting to the Host’s RS-422A/485 Port
Section 5-2
Note One end of the wire must always be connected to the host (PC), and there must be
no branching. Branching will cause problems such as transmission delays and
communication failures.
NT31
NT31C
PC
PC
NT31
PC
NT31C NT31CNT31 NT31 NT31 NT31 NT31
(At termination)
Relay terminal block Relay terminal block
Max. 2 m
(Not at
termination)
(Not at
termination)
(Not at
termination)
(At
termination)
Example of Good Connection Examples of Bad Connections
Reference: CS1 series CPUs cannot be connected with the 1:1 connection NT link method.
Use the 1:N connection NT link method instead to make the 1:1 connection. For
details, refer to “Using the NT link (1:N) Method” (page 127)
5-2-1 Host Types and Settings
The types of host that have an RS-422A port and can be connected to the
RS-422A/485 port of the NT31/NT31C, and the settings to be made at the host,
are described here.
When Using the Host Link Method
Compatible host units
Some models and series of OMRON PCs have the RS-422A/485 type host link
function built in. In a CS1 series, the host link method can be used by installing a
serial communication board. In addition, some C200HX/HG/HE (–Z) devices
have an integral CPU that can be connected in the host link method by installing
a communication board.
Check the model and series of the PC, the type of the installed serial commu-
nication board, the serial communication unit, and host link unit at the connection
end before making a connection.
The host units featuring the RS-422A/485 type host link function and can be con-
nected to the RS-422A/485 port of the NT31/NT31C are indicated in the table
below.
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