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Connecting to the Host’s RS-422A/485 Port
Section 5-2
5-2 Connecting to the Host’s RS-422A/485 Port
The methods for connecting the RS-422A/485 port of the NT31/NT31C and the
RS-422A/485 port of the host are described here. There are the following meth-
ods.
The following discussion is focused on the connection method to OMRON PCs
(By using the memory link method, a connection can be made to any arbitrary
RS-422 unit). When making a connection to a host other than OMRON PCs, refer
to the “ PC Connection” (V042-E1-).
Method in which the RS-422A ports of the NT31/NT31C and host are connected
directly by an RS-422A cable (page 133).
When this method is used, the cable length can be extended up to 500 m.
PT Host
RS-422A cable
(max. 500 m)
Method in which the RS-485 ports of the NT31/NT31C and host are connected
by an RS-485 cable (page 138).
When this method is used, the cable length can be extended up to 500 m.
This connection method canbe used only with the NT link (1:N) method of type
RS-485.
PT Host
RS-485 cable
(max. 500 m)
Method in which the RS-422A ports of multiple NT31/NT31Cs and the RS-422A
port of the host are connected in a 1:N connection (page 139).
This connection method is used with the RS-422A type NT link (1:N) method.
PT
Host
RS-422A cable
(max. total length 500 m)
Method in which the RS-485 ports of multiple NT31/NT31Cs and the RS-485
port of the host are connected in a 1:N connection (page 142).
This connection method is used with the with the RS-485 type NT link (1:N)
method.
PT
Host
RS-485 cable
(max. total length 500 m)
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