Comtrol Multiport Modems Windows NT - Manual (Page 16)

Driver and Adapter Information 16
Changing or Viewing Driver Configuration
3. Select, clear, or set the following as desired:
a. Verbose Event Log. Select this check box to cause longer messages to be
sent to the Windows NT Event Log. This added information can be useful
when debugging communications and configuration problems.
b. Scan Rate. Use this droplist to set the driver servicing rate. As a general
rule this is changed only if you are driving ports at rates in excess of 230.4
Kbps. For example, if you are using a RocketPort OctaCable running at
460.8 Kbps, select 4 ms. If you are running a RocketPort Plus at 921.6
Kbps, select 2 ms.
Note: Earlier versions of the Comtrol Windows NT driver also required an
interrupt (IRQ) setting in order to achieve high baud rates. The
improved servicing routine in the 4.x driver no longer requires an IRQ.
c. If you are using a RocketPort 485, or if you are using a standard
RocketPort with an external RS-232 to RS-485 converter, select the Enable
RS-485 check box to permit RS-485 operation, and you want to use RS-485
mode. If you are not using RS-485, leave this box box blank.
Note: This sets the driver to support RS-485. You must also configure each
port that you plan to use for RS-485.
4. When you are done working with the driver configuration options, select the
Main Setup tab to return to the Main Setup window, or the OK button to save
your configuration changes and exit.
Changes to RS-485 status take effect immediately on exit. Changes to the scan
rate or event log status require that you save your changes and restart the
server before your changes take effect.