Communication Port - Unitronics Vision OPLC V350-35-T2 Installation Manual

Communication Port

Turn off power before making communications connections.
Signals are related to the controller's 0V; the same 0V is used by the power supply.
Always use the appropriate port adapters.
Caution
The serial port is not isolated. If the controller is used with a non-isolated external
device, avoid potential voltage that exceeds ± 10V.
Port 1 is type RJ-11 and may be set to either RS232 or RS485 via jumper as shown below.
By factory default, the port is set to RS232, termination ON.
Use RS232 to download programs from a PC, and to communicate with serial devices
and applications, such as SCADA.
Use RS485 to create a multi-drop network containing up to 32 devices.
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,
and Pin 6 (DSR) signal is used for signal B.
RS232 to RS485 Jumper Settings
The figure to the right shows the
jumper factory default settings,
RS232, RS485 termination ON.
Note that in order:
To change the
communication setting to
RS485, both communication
standard jumpers must be
moved
To change the RS485
termination, both
termination jumpers must
be moved
To access the jumpers, you must
open the controller according to the
instructions beginning on page 9.
8
RS485**
Pin # Description
1 A signal (+)
2 (RS232 signal)
3 (RS232 signal)
4 (RS232 signal)
5 (RS232 signal)
6 B signal (-)
V350-35-T2 Installation Guide
Controller Port
Pin #1
Unitronics