97
Connecting to the Host’s RS-232C Port
Section 5-1
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
convertor unit (page 104).
This connection method is used with the RS-485 type NT link (1:N) method.
PT
Host
RS-232C/RS422A
convertor unit
RS-485 cable
(max. total length
500 m)
RS-232C
cable
(max. 2 m)
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 “NT link (1:N) method” (page 84).
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.
For the host link method, refer to “Host Link Method” (page 67).
For the NT link (1:1) method, refer to “NT Link (1:1) method” (page 81).
For the NT link (1:N) method, refer to “NT Link (1:N) method” (page 84).
For the memory link method, refer to “Memory Link Method” (page 88).
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