Quatech Asynchronous Communications Adapter QSCLP-100 - Manual (Page 24)

4800 4300 3300 1570 800 115.2
2000 1630 1100 900 330 230.4
1100 900 670 430 100 460.8
470 430 300 100 N/A 921.6
25%
trans
time
20%
trans
time
15%
trans
time
10%
trans
time
4%
trans
time
Maximum Load (pF)
Data Rate
(kbaud)
Note 1: The signal transition time ratio is defined as the percentage of the unit
interval or bit time (the inverse of the data rate) that is occupied by the signal
transitioning from -3V to +3V. The EIA/TIA-232-E standard defines a
maximum signal transition time ratio of 4%; most RS-232 receivers will
recognize signal transitions with much larger ratios. With a 4% signal transition
time ratio, EIA/TIA-232-E is limited to a theoretical data rate of 200 kbaud. If
maximum signal transition time ratio is extended to 10%, 15%, 20%, or even
25%, the maximum data rate achievable using EIA/TIA-232-E can be
increased past 200 kbaud.
Note 2: A typical value for capacitance per foot of standard cable is 50 pF/ft.
QSCLP-100 User's Manual 25