USB RS422 / RS485 Isolated


Model: U485G
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The U485G is a true industrial grade optical isolated USB to RS485 / RS422 converter. It can be mounted on a standard DIN rail or optional screws, so its easy to install it in any standard electrical enclosure.

An interesting feature of this converter is that it has a built-in terminal resistor which can easily be enabled or disabled with a slide switch on top of the converter. Additionally a second slide switch is used to switch between RS485 and RS422.

This converter is powered from the USB port so no external power supply is required.

Optical isolation is provided by four high-speed 6N137 opto-couplers from Fairchild Semiconductors, which provides super reliable isolation at voltages of up to 700V continuous and 3500V spike, which effectively will protect your equipment, the converter and the data communication against high voltage spikes, surges and ground loops; an essential feature to have in industrial environments.

Indication LED lights for TX and RX clearly indicates when data is present which is a great help when troubleshooting, or simply just to see when the converter is turned on and working.

The chipset in this USB to RS485 / RS422 converter is the highly reliable and high performance FT232BL processor from FTDI which leaves no question about the high quality of this converter.

Single RS485 / RS422 wires are easily connected via the terminal header on the left side of the converter.

Overall features
  • Fully optical isolated
  • USB port-powered
  • Industrial grade design
  • DIN mountable
  • Compatible with most operating systems
  • Indication LED lights for TX, RX and Power
Model number U485G
Recommended operating system
  • Windows 10 32/64, Windows 8 32/64, Windows 7 32/64, Vista 32/64, XP 32/64, Server 2003/8R2 32/64, 2000, ME, 98Se
  • Linux
  • Mac OS 8, OS 9, OS X
  • Windows CE.NET (Version 4.2 and greater)
  • Android
Processor FT232BL
Opto-coupler 6N137
Serial driver SP491EEN
Baud rate 300-3Mbps, auto detection
Power Port powered from USB port
Output 1 RS422 4 wire Full Duplex
Output 2 RS485 2 wire Half Duplex
Installation 35mm DIN mount or screws
RS422/RS485 selection Manual switch
USB cable 23 inches
Optical Isolation 700V continuous and 3500V spike
ESD protection 15KV / 400W
RS485 / RS422 interface Screw terminal header
USB interface Male type A
Parity None, Odd, Even, Mark, Space
Data bits 7, 8
Stop Bits 1, 2
Flow Control None, Xon/Xoff, Hardware
Indication LEDs TX, RX and Power
Buffer size 128/385 Bytes
Serial signals RS422: TX-, TX+, RX-, RX+, GND (full duplex)
RS485: D-, D+ GND (half duplex)
USB signals VCC, DATA+, DATA-, GND, FG
Flow control Automatic. No IRQ Conflicts, no IRQs, IO or DMA required
Operating humidity 5% To 95% - No Condensation
Operating Temp. -20 to 70C
Certifications CE, FCC, RoHS
Warranty 2-year Limited Warranty
ECCN 4A994.a
Schedule B 8471.80.1000
HTS 8517.18.0050

For alternative solutions please see our selection of other USB to RS485 / RS422 converters

RS485 / RS422 to USB converter

Click images to enlarge

RS485 / RS422 to USB converter RS485 / RS422 to USB converter RS485 / RS422 to USB converter
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