User Manual

Card Setup
Sealevel Systems COMM+4.PCI Page 6
Clock Modes
The COMM+4.PCI employs a unique clocking option that allows the end user
to select from divide by 4, and divide by 1 clocking modes. These modes are
selected at Header J1.
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 D4).
To select the Baud rates above 115.2K select the divide by 1 mode (silk-screen
D1).
Baud Rates and Divisors for the ‘DIV1’ mode
The following table shows some common data rates and the rates you should
choose to match them if using the adapter in the ‘DIV1’ mode.
For this Data Rate Choose this Data Rate
1200 bps 300 bps
2400 bps 600 bps
4800 bps 1200 bps
9600 bps 2400 bps
19.2K bps 4800 bps
57.6 K bps 14.4K bps
115.2 K bps 28.8K bps
230.4K bps 57.6 K bps
460.8K bps 115.2 K bps
If your communications package allows the use of Baud rate divisors, choose the
appropriate divisor from the following table:
For this Data Rate Choose this Divisor
1200 bps 384
2400 bps 192
4800 bps 96
9600 bps 48
19.2K bps 24
38.4K bps 12
57.6K bps 8
115.2K bps 4
230.4K bps 2
460.8K bps 1