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Pinouts
The pinouts below show PLC port signals.
To connect a PC to a port that is set to RS485, remove the RS485 connector, and connect the PC to
the PLC via the programming cable. Note that this is possible only if flow control signals are not used
(which is the standard case).
RS232
Pin #
Description
1*
DTR signal
2
0V reference
3
TXD signal
4
RXD signal
5
0V reference
6*
DSR signal
*Standard programming cables do not provide connection points for pins 1 and 6.
**When a port is adapted to RS485, Pin 1 (DTR) is used for signal A,
and Pin 6 (DSR) signal is used for signal B.
RS232 to RS485: Changing DIP Switch Settings
The port set to RS232 by factory default.
To change the settings, first remove the Snap-in I/O Module, if one is installed, and then set the
switches according to the following table.
RS232/RS485: DIP Switch Settings
RS232*
RS485
RS485 with
termination**
*Default factory setting
**Causes the unit to function as an end unit in an RS485 network
Ethernet
Implement communications via TCP/IP, such as MODBUS over TCP.
RJ45 Connector Pinout
Pin #
Description
1
T+ = Positive transmit signal
2
T- = Negative transmit signal
3
R+ = Positive receive signal
6
R- = Negative receive signal
6
RS485**
Pin #
1
2
3
4
5
6
Switch Settings
1
2
3
ON
ON
ON
OFF
OFF
OFF
ON
ON
OFF
Description
A signal (+)
(RS232 signal)
(RS232 signal)
(RS232 signal)
(RS232 signal)
B signal (-)
4
5
6
ON
OFF
OFF
ON
OFF
ON
ON
ON
OFF
Vision™ Installation Guide
Controller Port
Pin #1
Ethernet LEDS
LED
Function
Green
ON when link
(LNK)
exists
Yellow
Blinks during
(ACT)
RX/TX
Unitronics
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