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Pinouts
The pinouts below show the 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, Pin 6 (DSR) signal for signal B.
RS232/RS485: DIP Switch Settings
The settings below are for each COM port.
RS232*
RS485
RS485 with
termination**
*Default factory setting
**Causes the unit to function as an end unit in an RS485 network
Removing a Snap-in I/O Module
1. Locate the four buttons on the sides of the controller, two on either side.
2. Press the buttons and hold them down to open the locking mechanism.
3. Gently rock the module from side to side, easing the module from the controller.
10
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
OFF
ON
V570-57-T34 Installation Guide
Controller Port
Pin #1
Unitronics
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