Keyspan 1.9 - Manual (Page 15)

The Default buffer size text box allows to set a different buffer size to be established for the
specified Adapter port. This change takes effect upon restart of your computer. Since most
applications which use serial ports supply their own buffer, this setting often has no benefit.
The Double Baud Rate check box will allow certain older applications to use higher data rates
than were foreseen when the application was written. Some applications, for example, may not
provide the opportunity to select a baud rate above 57.6 Kbps. When this check box is checked, the
port will use a baud rate which is exactly double the rate specified in the application software.
Changes will take effect upon restart of your computer.
WARNING: DO NOT enable this check box if you do not need to. Enabling
this check box in software that supports the baud rates higher than
57.6 will cause that software to operate incorrectly.
The Tx Ack Advance popup menu allows you to set the Keyspan adapter's transmit behavior to
achieve the optimum compromise between compatibility (exact emulation of built-in ports) and
maximum throughput. Please read the
TX Ack Advance appendix in this manual for more detailed
information.
The RTS follows DTR check box will cause the RTS modem signal to follow the DTR modem
signal. This option is ON by default. You should not modify this setting unless you are sure that
you need to.
The Emulate Modem/Printer Port check box allows your Keyspan adapter to emulate the
"Printer Port" or "Modem Port" as found on older Macintosh computers. This allows software that
is not CommToolBox Savvy to use a port on the Keyspan adapter.
Note: This option is only available on Macs that do not have a built-in
Modem or Printer (ie "Blue and White" G3s, iMacs, iBooks, etc.). On
Keyspan Adapters that only have ONE serial port, you can only emulate
the Printer port.
(continued on next page...)
Keyspan:High Speed USB Serial Adapter for Mac OS-v1.9 User Manual
This User Manual applies to the Keyspan High Speed USB Serial Adapter Software for Mac OS.
(rev 02may12JA)
Page 15