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5030440035001670800115.2
2100167012001000330230.4
1
0
00
900
670
430
100
460.8
470430200100N/A921.6
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.
Quatech DSC-100 User's Manual
30