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Installation Guide
Power Supply
The controller requires an external 24VDC power supply. The permissible input voltage range is
20.4-28.8VDC, with less than 10% ripple.
A non-isolated power supply can be used if a 0V signal is connected to the chassis.
You must use an external circuit protection device.
Install an external circuit breaker. Guard against
short-circuiting in external wiring.
Double-check all wiring before turning on the power
supply.
Do not connect either the 'Neutral or 'Line' signal of
the 110/220VAC to device's 0V pin.
In the event of voltage fluctuations or non-conformity
to voltage power supply specifications, connect the
device to a regulated power supply.
To avoid electromagnetic interference, earth the
power supply as described on page 3.
Communication Ports
This series comprises 2 RS232/RS485 serial ports and a CANbus 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.
Caution
Always use the appropriate port adapters.
Serial Communications
The serial ports are type RJ-11 and may be set to either RS232 or RS485 via DIP switches, in
accordance with to the table shown on page 7.
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.
Caution
The serial ports are isolated. If the controller is used with a non-isolated external device,
avoid potential voltage that exceeds ± 10V.
Pinouts
The pinouts below show the signals between the adapter and port.
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.
Unitronics
RS485**
Pin #
Description
1
A signal (+)
2
(RS232 signal)
3
(RS232 signal)
4
(RS232 signal)
5
(RS232 signal)
6
B signal (-)
Controller Port
Pin #1
5
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