Low-cost standard USB to RS422 / RS485 adapter suitable mainly for older operating systems and applications. This is a basic and cost-effective converter that lets you connect a RS422 or RS485 device directly to your computer's USB port, converting USB signals to half-duplex RS485 signals and full-duplex RS422 signals and vice versa.
This USB to RS422 / RS485 adapter is powered from the USB port so no external power supply is needed. The RS422 / RS485 end is a standard 9-pin D-sub connector with a optional screw terminal board included for easy connection of cables or single wires.
Automatic send data control is enabled by default so no external flow or handshake control is needed.
Not Recommended for any Applications
We do not recommend using this converter under any circumstances unless your application specifically requires a converter with the Prolific PL-2303 processor chip.
The Prolific processor is a low-cost solution with several known problems, so the only reason we sell this converter is because a few of our customers require this converter due to outdated or other application specific reasons.
Drivers
Drivers for this converter are compatible with Windows 98Se, ME, 2000, XP, Server 2003, Mac and older versions of Linux but has only limited compatibility with Windows 7 and Vista. It is NOT compatible with Windows 8 and 8.1.
We highly recommend our Pro USB to RS422 / RS485 converter which is optimized and fully compatible with Windows 7 Windows 8 and 8.1 as a replacement for this converter.
Overall features
- Best for only older operating systems
- Low-cost solution
- USB port powered converter
- Terminal board included with each converter
- Hexagonal nut stand-offs for connecting thumbscrews
- Processor: Prolific PL2303HX
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Resources
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| SPECIFICATIONS |
| Part number |
XS850 |
| Operating system |
- Windows 98, ME, 2000, XP32, Server 2003
Since this is a low-cost adapter it has limited compatibility and is not recommended for Windows Vista, Windows 7 and it will not work with Windows 8
- Mac OS X 8, 9, 10, 10.6
- Linux
- Windows CE 5.0
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| Processor |
Prolific PL2303HX |
| RS485 / RS422 Interface |
DB9 Male / included screw terminal header |
| USB interface |
Standard Type A Male |
| Indication LEDs |
No |
| Ports |
1-port |
| Signals |
- RS485: D+, D-, GND
- RS422: TX+, RX-, TX+, RX-, GND |
| Power on pin 9 |
No |
| Baud rate |
300bps to 115200bps |
| Parity |
None, Odd, Even, Mark, Space |
| Data Bits |
5, 6, 7 or 8 |
| Stop Bits |
One, one and a half, or two stop bits |
| TX / RX buffer size |
Configurable 512-byte bi-directional data buffer
- 256-byte outbound buffer and 256-byte inbound buffer; or
- 128-byte outbound buffer and 384-byte inbound buffer |
| Adjustable USB transfer sizes for TX and RX |
From 64 bytes to 4096 bytes |
| Flow Control |
None, Xon/Xoff, Hardware |
| COM port accessible by |
Included virtual COM port drivers |
| Electrostatic (ESD) protection |
600W surge protection, 15KV static electricity protection |
| Current draw |
less than 100mA |
| Interface compliance |
USB1.1,2.0,3.0, EIA/TIA RS-232 |
| Regulatory compliance |
FCC, CE and RoHS |
| Working temp |
-20°C to 60°C |
| Warranty |
1 year limited warranty |
For alternative USB to serial RS485 and RS422 solutions please see our full selection of USB to Serial RS485 converters
