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Connecting to the Host’s RS-232C Port Section 5-1
Note One end of the wire must always be connected to the host (PLC), and there
must be no branching. Branching will cause problems such as transmission
delays and communications failures.
Reference: CS/CJ-series CPU Units cannot be connected with the 1:1 connection NT
Link method. Use the 1:N connection NT Link method (standard or high-
speed) instead to make the 1:1 connection. For details, refer to Using the NT
Link (1:N) Method (page 65) or Using the High-speed NT Link (1:N) Method
(page 70).
5-1-1 The Type of Host and Settings
The using condition is the same as the connecting PT side RS-232C and the
host side RS-232C.
For the available type and settings of the host, refer to the pages listed below.
Settings at the RS-232C/
RS-422A Adapter (NT-
AL001)
When making a connection between RS-232C and RS-422A/485 ports using
an RS-232C/RS-422A Adapter, set the DIP switches on the NT-AL001 as fol-
lows.
PT Host
RS-485 cable
(max. total length
500 m)
RS-232C
cable
(max. 2 m)
RS-232C/RS422A
convertor unit
NT631
NT631C
PLC
PLC
NT631
PLC
NT631C NT631CNT631 NT631 NT631 NT631 NT631
(At termination)
Relay terminal block Relay terminal bloc
k
Max. 2 m
Exam
p
le of Good Connection Exam
p
les of Bad Connections
(Not at
termination)
(Not at
termination)
(Not at
termination)
(At
termination)
Method Reference
Host link Host Link Method (page 48)
NT Link (1:1) NT Link (1:1) method (page 61)
NT Link (1:N) Using the NT Link (1:N) Method (page 65)
High-speed NT Link (1:N) Using the High-speed NT Link (1:N) Method (page 70)
Memory link Memory Link Method (page 73)