USB RS485 / RS422 Standard


Model: XS850
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If you need a USB to RS485 / RS422 converter for older operating systems and legacy devices then this converters is suitable. It is designed around the low-cost processor chip PL-2303HX from Prolific which is a good all-round processor ideal for many low-performance applications, simple point-to-point setups and devices however we do not recommend using this converter for newer operating systems (Windows Vista, 7, Mac OS-X), complex and industrial applications.

The XS850 is a bi-directional converter, it communicates in both directions, it has both RS485 and RS422 capabilities and is powered through the USB port so no external power supply is required. The serial connector is a standard DB9 male connector and a screw terminal header for easy connection of single wires is included with each converter.

The drivers that comes with this USB to RS485 / RS422 converter are standard drivers compatible with older operating systems (Windows 95, 98, 2000) and simple point-to-point networks, so again: WE DO NOT RECOMMEND USING THIS CONVERTER WITH NEWER OPERATING SYSTEMS OR COMPLEX DEVICES.

Overall features
  • Ideal for older operating systems
  • RS485 and RS422 capabilities
  • Port powered from USB port
  • Baud rates from 300bps to 921.600bps
  • Surge / static electrical protection up to 2500 Vrms/600W
  • FCC, RoHS, CE certified

Model number XS850
Recommended operating system
  • Windows 98, ME, XP 32-bit
  • Linux ver 2.4 or older
  • Mac OS 8
For newer operating systems please see our selection of other USB to RS485 / RS422 converters
Processor PL-2303HX
Baud rate 300-921.600bps, auto detection
Power Port powered from USB port
RS485 / RS422 interface DB9 male + optional screw terminal header
USB interface Male type A
Cable length 3 feet (1 meter)
Parity None, Odd, Even, Mark, Space
Data bits 7, 8
Stop Bits 1, 2
Flow Control None, Xon/Xoff, Hardware
Indication LEDs No
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
Current draw
Static less than 80mA, dynamic average consumption less than 150mA
ESD electrostatic protection 15KV / 600W/ms
Operating humidity 5% To 95% - No Condensation
Operating Temp. -40 to 85C
Certifications CE, FCC, RoHS
Warranty 2-year Limited Warranty
ECCN 4A994.a
Schedule B 8471.80.1000
HTS 8517.18.0050

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