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How to download the CH340 driver?
Down load website 1:
http://www.cesareriva.com/category/usbserial-converter/
Down load website 2:
http://wch-ic.com/products/CH340.html?from=list
Standard: compatible with USB 2.0 using USB am print port standard,
backward compatible, comply with RS485 standard
Direction control: adopt data flow to automatic control technology
to automatically identify and control data transmission direction
Baud rate: 300-9216000 bps, automatic detection of serial signal
rate
Load capacity: support point to multipoint
Interface protection: TVS tube protection, USB self-recovery
protection
Features:
USB to RS485 Converter Adapter can be supported on systems like
Windows 7, Windows XP, Linux, etc.
Power Supply: Not required
Compatibility: USB 2.0, USB1.1
Baud Rate: 75 bps to 115200 bps.
Maximum Baud Rate: Up to 6 Mbps