Impulse 7104 - Manual (Page 4)

Introduction and Card Setup
Sealevel Systems COMM+850.LPCI Page 2
Card Setup
Address and IRQ selection
The COMM+850.LPCI is automatically assigned resources by your motherboard BIOS. Only the I/O address may
be modified by the user.
Adding or removing other hardware may change the assignment of I/O addresses and IRQs.
Clock Modes
The COMM+850.LPCI 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) position.
To select the maximum data rates up to 460.8K bps place the jumper in the divide by 1 (silk-screen D1) position.
Please refer to the following page for these additional data rates.
Baud Rates and Divisors for the ‘D1’ mode
The following table shows some common data rates and the rates you should choose if using the adapter in the ‘D1’
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