Vertiv USB485I interface cards/adapter

How It Works
Supporting two-wire RS-485
communications, Model includes
circuitry with 2000 volts isolation to
protect against ground loops and voltage
spikes. This model uses a pluggable
terminal blocks on the RS-485 side.
Two light-emitting diodes (LEDs) indicate
whether data is being transmitted or
received. The converters draw power
from the USB port, so no power supply
is required (USB cable included).

Ensure Secure Communication
No special software is required to
control the RS-485 converter.
The driver is automatically enabled
when the converter is plugged into the
RDU101 card. The USB485I uses a pair
of wires to send a differential signal over
distances up to 1000 feet without a
repeater. The differential signal is ideal
in applications that require security, noise
immunity and long-distance. RS-485 is
capable of multi-drop communications –
up to 32 nodes.