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Connecting to the Host’s RS-232C Port Section 5-1
5-1 Connecting to the Host’s RS-232C Port
The methods for connecting the RS-422A/485 port of the NT31/NT31C and
the RS-232C port of the host are described here. There are the following
methods.
The following discussion is focused on the connection method to OMRON
PLCs (By using the memory link method, a connection can be made to any
arbitrary RS-232 unit). When making a connection to a host other than
OMRON PLCs, refer to the PLC Connection Manual (V042-E1-@) or NT31/
631 Multi Vendor Connection Manual (V060-E1-@).
• Method in which the RS-422A port of the NT31/NT31C and the RS-232C
port of the host are connected in a 1:1 connection via an RS-232C/RS-
422A Adapter (page 82).
When this method is used, the cable length can be extended up to
500 m.
• Method in which the RS-485 port of the NT31/NT31C and the RS-232C
port of the host are connected in a 1:1 connection via an RS-232C/RS-
422A Adapter (page 82).
When this method is used, the cable length can be extended up to
500 m. This connection method can be used only with the NT link
(1:N) method of type RS-485.
• Method in which the RS-422A ports of multiple NT31/NT31Cs and the
RS-232C port of the host are connected in a 1:N connection via an RS-
232C/RS-422A Adapter (page 86).
This connection method is used with the RS-422A type NT link (1:N)
method.
• Method in which the RS-485 ports of multiple NT31/NT31Cs and the RS-
232C port of the host are connected in a 1:N connection via an RS-232C/
RS-422A Adapter (page 86).
This connection method is used with the RS-485 type NT link (1:N)
method (standard or high-speed).
PT Host
RS-232C/RS-422A
convertor unit
RS-422A cable
(max. 500 m)
RS-232C
cable
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