User Manual

Card Setup
Sealevel Systems ULTRA COMM+422.PCI Page 6
Clock Modes
The ULTRA COMM+422.PCI employs a unique clocking option that allows
the end user to select from divide by 4, divide by 2 and divide by 1 clocking
modes. These modes are selected at Headers J1C through J4C.
To select the Baud rates commonly associated with COM: ports (i.e. 2400,
4800, 9600, 19.2, … 115.2K Bps) place the jumper in the divide by 4 mode
(silk-screen DIV4).
DIV1 DIV2 DIV4
Figure 7 - Clocking Mode 'Divide By 4’
To double these rates up to a maximum rate for 230.4K bps place the jumper in
the divide by 2 (silk-screen DIV2) position.
DIV1 DIV2 DIV4
Figure 8 - Clocking Mode 'Divide By 2’