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Using configuration utilities Quatech Freedom USB-1/2/300 User’s Manual
Setting advanced options
Notes: Changing any setting in
the advanced options window
affects all ports on the
Freedom USB adapter.
The Freedom USB port properties can only be altered from the Device
Manager window. Attempting to access these properties from another
software program will generate an error message box that refers you
to the Device Manager.
See Exploring Device Manager screen on page 34 for help in
navigating through the Device Manager screens.
Data Rate Multiplier
The Freedom USB uses an accelerated UART clock frequency to boost
data rates to as high as 460,800 bits per second. This setting
determines the amount of data rate acceleration applied.
Notes: We recommend leaving
the Data Rate Multiplier in
Auto mode unless the
application specifically requires
otherwise.
Auto (default)
Select this radio button to allow the USB serial port device drivers to
automatically adjust the clock as necessary. The software application
can request any desired baud rate up to 460,800 bits per second.
Note: This setting is suitable
for most applications.
Force X1 mode
Select this radio button to limit each serial port to a maximum of
115,200 bits per second. The software application can request any
desired baud rate up to 115,200 bits per second.
Note: This setting will not
enhance most applications.
Force X2 mode
Select this radio button to allow each serial port to run at a maximum
of 230,400 bits per second. The software application can request any
desired baud rate up to 115,200 bits per second. The actual baud rate
will be two (2) times higher than requested.
Note: This setting allows
applications not capable of
asking for higher baud rates to
achieve them.
Force X4 mode
Select this radio button to allow each serial port to run at a maximum
of 460,800 bits per second. The software application can request any
desired baud rate up to 115,200 bits per second. The actual baud rate
will be four (4) times higher than requested.
Note: This setting allows
applications not capable of
asking for higher baud rates to
achieve them.
Connector Signal Selection (DSU/QSU/ESU/HSU-200/300 only)
This setting determines which signals are routed to the AuxIn and
AuxOut pins of the serial port connectors. Regardless of which setting
is chosen, each UART's DTR output is internally looped back to its
own DSR, DCD, and RI inputs.
Page 44 Rev 2.02 (2/24/2004)