Quatech USB to RS-232/422/485 Isolated Converter SSU2-400I - Manual (Page 9)

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Product Panel Views Description
Product Views
USB Type B Connector
Power Outlet - The USB to Serial converter is powered by USB (Universal
Serial Bus) port a single 5V DC (Inner positive/outer negative) power supply
and 500mA of current. If the power is properly supplied, the SYS indicator of
red color LED will be on.
Serial I/O Port
RS-232
LED Indicators
USB Type B
Connector
Serial I/O Port
RS422/485