Card Setup; Clock Modes - Black Box IC142C Manual

8-PORT SERIAL HOST ADAPTER PCI

3.1 Clock Modes

The adapter employs a unique clocking option that allows the end user to select
from divide-by-4 and divide-by-1 clocking modes. This mode is selected at J1.
To select the baud rates commonly associated with COM ports (2400, 4800, 9600,
19.2, ... 115.2 kbps), place the jumper in the divide-by-4 position (marked DIV4).
To select the maximum data rate (460.8 kbps), place the jumper in the divide-
by-1 position (marked DIV1).
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3. Card Setup

Figure 3-1. Clocking mode "Divide By 4."
Figure 3-2. Clocking mode "Divide By 1."