Quatech USB to RS-232/422/485 Isolated Converter SSU2-400I - Manual (Page 4)

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Introduction
Thank you for your purchase of the USB to serial adapter. Featuring USB
(Universal Serial Bus) interface technology, it is converted the USB to RS-232 or
industrial RS422/485, so it can be easily adopted for industrial machines with
RS232 or RS422/485 interfaces. The USB to Serial converter is fully compatible
with the USB V1.0 2.0 . This converter is USB bus powered and does not need
any power adapter. You can connect a PC USB port or USB hub to this converter
via USB cable and High-Speed RS-232/422/485 serial port (Auto-Detection) which
features easy connectivity for traditional serial devices in your working
environments.
The RS232 standard supports handshaking signals (such as RTS, CTS) and
full-duplex communication. For the RS485 control, it is completely transparent to
user and their software written for Half-Duplex COM works without any extra
modification effort.
The USB to Serial Isolated Converter meets the industrial level as it provides 3000
VDC of isolation to protect the host computer or other connected equipments from
ground loops and destructive voltage spikes on the RS-232/422/485 data lines. It
also offers internal surge-protection on data lines. Internal high-speed transient
suppressors on each data line to protect it from dangerous voltages levels or
spikes.