Quatech Asynchronous Communications Adapter QSCLP-100 Manuale Utente Scaricare il pdf (Pagina 24)

4800430033001570800115.2

200016301100900330230.4

1100900670430100460.8

470430300100N/A921.6

25%

trans

time

20%

trans

time

15%

trans

time

10%

trans

time

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

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Quatech Asynchronous Communications Adapter QSCLP-100 Manuale Utente Pagina 24