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1-11
1 Introduction
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
1-5 System C
onfigu
ration
s
1
1
-5-1
P
rotocol Ma
cro
, Ser
ial Gate
w
a
y, No-protocol, or Mod
b
us-R
T
U
Sla
v
e
*1
With the CJ1W-SCU[]2, the maximum total cable length for RS-422/485 is 1200 m. The length when an NT-AL001
Link Adapter is used is 500 m. In both cases, the length includes branch lines. Communications distance may
vary by the device being connected. Refer to the manual for the device.
*2
The maximum length is restricted to 2 m when an NT-AL001 Link Adapter is connected.
PLC:
General-
purpose
external
device
Connection configuration
Required
devices
Connected
serial
communica-
tions
port/Remarks
1:1
Port: RS-
422A/485
Connection of a Serial Communications Unit to a device with an RS-
232C or RS-422A/485 port
CJ1W-SCU32
Port 1 or 2
CJ1W-SCU42
Port 1
NT-AL001 Con-
verting Link
Adapter
Convert between
RS-232C and
RS-422A/485
5-V power sup-
ply
For NT-AL001
Link Adapter
NT-AL001
RS-232C
RS-422A/485
Resistance ON
5-V power
RS-232C interface
RS-422A/485 interface
RS-422A/
485
Resistance ON
Resistance ON
Resistance ON
*1
*1
*2