7
．
Serial Communications Connection Procedure
15
Controller Setup
7.3.
Set up the Controller.
7.3.1. Hardware Settings
Set the hardware switches on the Serial Communications Unit and connect the cables.
Precautions for Correct Use
Make sure that the power supply is OFF when you set up.
If it is ON, the settings described in the following steps and subsequent procedures may not
be applicable.
1
Make sure that Controller is
powered OFF.
2
Check the positions of the
hardware switches and Port 1
on the front panel of Serial
Communications Unit by
referring to the figure on the
right.
3
Set Unit number switch to
0
.
*The unit number is set to 0 as
the factory default setting.
4
Set Terminating resistance
ON/OFF switch to
ON
.
(Terminating resistance ON)
5
Set 2-wire or 4-wire switch to
2
.
(2-wire)
・
TERM
(Terminating resistance ON/OFF switch)
OFF: Terminating resistance OFF
ON: Terminating resistance ON
・
WIRE (2-wire or 4-wire switch)
2: 2-wire, 4: 4-wire
