
COMMBOX PTY LTD | ABN: 431 583 817 05 | Telephone: +61 2 9975 6001 | Fax: +61 2 9975 2032
PO Box 6667, Frenchs Forest NSW 2086 Australia | www.commbox.com.au
AUSTRALIA, CHINA, MALAYSIA, SINGAPORE, KOREA, SOUTH AFRICA
Third Party Integration
The USB switcher is powered from the USB host(s) to which it is connected.
Control is via the 10 way IDC ribbon header.
Your 3
rd
part controller needs two active low or TTL level outputs – the USB switcher will pull
them high to 3.3 volts via 20k ohms. To select hosts 2, 3 or 4, pull the lines low according to
the truth table below.
Connections and control truth table
(Trace is Pin 1)
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