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6.2. Cable Wiring
For details on cable wiring, refer to SECTION 3 Installation and Wiring of the CJ Series Serial
Communications Units OPERATION MANUAL (Cat. No. W336).
Check the connector configurations and pin assignments before wiring.
■Connector configuration and pin assignment
Serial Communications Unit (CJ1W-SCU42) applicable connector: Terminal block
Pin No.
1 (See note 1.)
2 (See note 1.)
3 (See note 1.)
4 (See note 1.)
5 (See note 2.)
Note
1: For 2-wire connection, use either pins 1 and 2 or pins 3 and 4.
2: Pin 5 (Shield) is connected to the GR terminal on the Power Supply Unit though the
Serial Communications Unit. The cable shield can thus be grounded if you ground
the GR terminal of the Power Supply Unit.
Digital Temperature Controller (E5CD) applicable connector: Terminal block
Pin No.
Signal name
1-12
13
14
15-18
■Cable and pin assignment
Serial Communications
Unit (CJ1W-SCU42)
RS-422A/
Signal
485
name
interface
RDA-
RDB+
SDA-
SDB+
FG
Terminal block
Additional Information
For information on the connector configurations and pin assignments of the other models,
refer to their respective manuals.
Symbol
Signal name
RDA
Receive data -
RDB
Receive data +
SDA
Send data -
SDB
Send data +
FG
Shield
Input/Output
B(+)
Input/Output
A(-)
Input/Output
Pin No.
1
Terminating resistance
2
3
4
5
6．Serial Communications Settings
Input/Output
Input
Input
Output
Output
-
Digital Temperature Controller
Terminal
No.
13
14
Terminal block
*Connect 120 Ω (1/2 W) terminating resistance
between B(+) and A(-) of the Digital Temperature
Controller that is connected at the end of the
network.
（E5CD）
Signal
RS-485
name
interface
B(＋)
A(－)
10
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