Samba™ OPLC™
Unitronics
11
Earthing the OPLC
To maximize system performance, avoid electromagnetic interference by:
Mounting the controller on a metal panel.
Connect each common and ground connection directly to the earth ground of your system.
For ground wiring use the shortest and thickest possible wire.
Communication Port
Turn off power before making communications connections.
Caution
Always use the appropriate port adapters.
SM43-J-R20/SM43-J-T20
This series comprises a USB port.
Caution
The USB port is not isolated. Make sure that the PC and the controller are grounded to
same potential.
The USB port may be used for programming, OS download, and PC access.
SM35-J-R20/SM35-J-T20
This series comprises a build-in RS232 port.
Caution
Signals are related to the controller’s 0V; the same 0V is used by the power supply.
The serial port is not isolated. If the controller is used with a non-isolated external device,
avoid potential voltage that exceeds ± 10V.
Use RS232 to download programs from a PC, and to communicate with serial devices and
applications, such as SCADA.
Pinouts
The pinouts below show the PLC port signals.
RS232
Pin #
Description
1
Not connected
2
0V reference
3
TXD signal
4
RXD signal
5
0V reference
6
Not connected
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