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© Sealevel Systems, Inc. 3420 Manual | SL9145 9/2022
Clock Modes
The
COMM+8
employs a unique clocking option that allows the user to select from divide by 4 or divide by
1 clocking modes. This mode is selected at E12.
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).
D
IV
1
D
IV
4
Figure 7 - Clocking Mode ‘Divide By 4’
To select the maximum data rate (460.8K bps) place the jumper in the divide by 1 (silk-screen DIV1) position.
D
IV
1
D
IV
4
Figure 8 - Clocking Mode ‘Divide By 1’
Baud Rates and Divisors for the ‘Div1’ mode
The following table shows some common data rates and the matching data rates you should choose 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
