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Hardware Configuration
Address and IRQ selection
The COMM+8.422.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.
Clock Modes
The COMM+8.422.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.
Baud Rates
The following table shows some common data rates and the rates you should choose to achieve them
when using the COMM+8.422.PCIe.
For This Data Rate
19.2K bps
38.4K bps
57.6K bps
115.2K bps
230.4K bps
460.8K bps
921.6K bps
© Sealevel Systems, Inc.
7802e Manual | SL9249 11/2022
1200 bps
2400 bps
4800 bps
9600 bps
Clock Prescaler
3.625
3.625
1.875
1.875
1.375
1.375
22.625
1
1
2.125
2.125
Choose This Divisor DLM:DLL
898
449
434
217
148
74
3
34
17
4
2
7
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