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Connecting with a 1:1 NT Link
Section 3-4
3-4
3-4-1
Connecting with a 1:1 NT Link
Connection Methods
This section describes the methods for connecting the host to a serial port of
the PT using RS-232C, RS-422A or RS-485 communications. The connection
methods are as follows:
Direct Connection to
the COM 1 Serial Port
This is the easiest connection method. OMRON cables with connectors can
be used, depending on the host being connected.
Using RS-232C
PT
RS-232C cable
(15 m max.)
Host
Connection to COM2
Serial Port using RS-
This connection method allows an extended communications distance of up
to 500 m.
422A/485
PT
Host
RS-422A/RS-485 cable
(500 m max.)
Using RS-232C and RS-422A or RS-232C and RS-485 allows connecting two
hosts at the same time. Any combination of devices can be connected to the
PT.
PT
Host 1
RS-232C cable
RS-422A/RS-485 cable
Host 2
To use the COM2 serial port, the SW2 DIP switch on the back of the PT must
be set.
Pin No.
Pin 1
Function
COM2 RS-422A/485 set-
RS-485
ON
OFF
RS-422A
ting
Pin 2
COM2 RS-422A/485 set-
RS-485
RS-422A
ting
Pin 3
Pin 4
COM2 terminating resis-
tance setting
Not used
Terminating resis-
tance enabled
---
Terminating resis-
tance disabled
---
Precautions
for Safe Use
? Always tighten the connector screws after connecting communica-
tions cables. The tightening torque of the serial port COM2 is 0.2 N·m.
? The connector's pull load is 30 N.
Do not subject the connectors to a greater load than that specified.
24
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