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The Ultra COMM+8.PCIe is automatically assigned I/O addresses and IRQs by your motherboard
BIOS or by a 'Plug-n-Play' Operating System. Adding or removing other hardware or moving the
adapter to another slot may change the assignment of I/O addresses and IRQs.
The Ultra COMM+4.PCIe derives a 62.5MHz clock from the PCI express link which is divided by
a 8 bit clock prescaler and a 16 bit clock divisor to provide a wide range of possible baud rates.
Note that there are many combinations that can give the same result (e.g. Prescaler=1 and
Divisor = 8, Prescaler =2 and Divisor = 4, or Prescaler=8 and Divisor = 1). As long as the
calculated data rate is within +/- 2% you should communicate fine.
The following table shows some common data rates and the rates you should choose to achieve
them when using the ULTRA COMM+8.PCI
For This Data Rate
1200 bps
2400 bps
4800 bps
9600 bps
19.2K bps
38.4K bps
57.6K bps
115.2K bps
230.4K bps
460.8K bps
921.6K bps
©Sealevel Systems, Inc.
SL9219 – 04/2013
Clock Prescaler
1
1.625
1.750
1.875
1.5
1.75
1.825
1.875
1
2.125
2.125
7804e Manual
Choose This Divisor DLM:DLL
3255
1001
465
217
136
588
37
18
17
4
2
6
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