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USB485I
USB to RS-485 Converter
Overview
The Vertiv USB485I converts universal
serial bus (USB) port to a RS-485 port.
With high retention USB connector
designed to hold a standard USB
cables in place, these devices are ideal
for applications requiring long range or
multi-drop capabilities.
Benefits
Quick and easy installation
Enables additional
connectivity for devices
requiring communication
with the building management
system (BMS)
Provides serial connection for
secure communication from
the BMS back to connected
devices
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 dierential signal over
distances up to 1000 feet without a
repeater. The dierential 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.
Features
2000V RMS optical isolation
460.8 kbps data rate
Powered by USB port
High-retention USB port
USB cable included
USB485I
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USB485I
Technical Specifications
Serial Technology
RS-485 2-Wire Data A(-), Data B(+), GND
Connector Terminal block
Data Rate 460.8 Kbps
Isolation 2 kV RMS
Surge Protection 15kV ESD
Industrial Bus Modbus RTU
Bias 4.7 KΩ on receive lines in RS-485 mode
USB Technology
USB Compatibility 1.1 and 2.0
Speed 1.5, 12 Mbps
Connector Type B High Retention (15 N / 3.4 lbs-force with-
drawal)
Power
USB Low power device (draws <100 mA)
Indicators
LEDs Transmit Data, Receive Data
Mechanical
Dimensions 8.9 x 4.3 x 2.1 cm (3.5 x 1.7 x 0.8 in)
Enclosure IP30, Plastic
Meantime Between Failures (MTBF)
MTBF BB-USOPTL4-xx 1,318,809 hours
MTBF Calculation MIL 217F Parts Count Reliability Method
Environmental
Operating Temperature 0 to +70 °C (32 to +158 °F)
Operating Humidity 0 to 95%, non-condensing
Regulatory
CE - Directives
CE - Standards
2014/30/EC - Electromagnetic Compatibility
2011/65/EU - Reduction of Hazardous Substances (RoHS2)
2012/19/EU - Waste Electrical and Electronic Equipment (WEEE)
EN 55032: Class B - Electromagnetic Compatibility of Multimedia
Equipment - Emission Requirements
EN 55024 - Information Technology Equipment
- Immunity Characteristics
EN 61000-6-1 - Generic Immunity for Residential, Commercial,
Light-Industrial Environments
EN 61000-6-3 A1 - Generic Emissions for Residential, Commercial,
Light-Industrial Environments (Class B)
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Product Overview
Quick Start Guide
Model USB485I
USB to RS-485 Isolated Converter
Before you begin, be sure you have
the following:
USB Serial Converter
(Model USB485I)
LED
LEDUSB PORT
TERMINAL BLOCK
WIRING INFORMATION
SERIAL CONNECTER
TERMINAL BLOCK
USB Cable
1. Connect the Converter
2-WIRE SET-UP
Connect the converter to the USB-A
port of the RDU101 monitoring card
2. Wire the Converter
USB485I RS-485
TDA(-) NEG(-)
2-Wire RS-485 (half-duplex)
TDB(+) POS(+)
GND GND
Vertiv.com | Vertiv Headquarters, 1050 Dearborn Drive, Columbus, OH, 43085, USA
© 2019 Vertiv G roup Corp. All right s reserved. Verti v™ and the Vertiv logo are tr ademarks or regis tered trademarks of Ver tiv Group Corp. All o ther names and log os referred to are trad e names, tradema rks or registered tra demarks of their res pective owners . While every
precauti on has been taken to en sure accuracy and c ompleteness he re, Vertiv Group Cor p. assumes no resp onsibility, and dis claims all liabili ty, for damages resu lting from use of this inf ormation or for any erro rs or omissions . Specificatio ns, rebates and oth er promotional
oers are su bject to change at Ver tiv’s sole discret ion upon notice.
SL-70523 (R011/19)
NOTE :
THE MAXIMUM RS-48 5 CABLE
LENGTH IS 1000 FEET (30 4.8M).
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