Quatech ESC-100 user manual Maximum Load pF Data Rate 10% 15% 20% 25% Kbaud Trans Time

Page 33

 

 

Maximum Load (pF)

 

Data Rate

4%

10%

15%

20%

25%

(kbaud)

trans

trans

trans

trans

trans

 

time

time

time

time

time

921.6

N/A

100

300

430

470

460.8

100

430

670

900

1100

230.4

330

900

1100

1630

2000

115.2

800

1570

3300

4300

4800

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 ESC-100 User's Manual

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Contents ESC-100 Warranty Information Page Declaration of Conformity Base Address and Interrupt Level IRQ Address Map and Special RegistersEnhanced Serial Adapter Identification Viewing Resources with Device ManagerGeneral Information Connector TypeIND Option --- Surge Suppression Upgrade FeaturesHardware Configuration Factory Default ConfigurationEnable Scratchpad Register SPAD, J4 Clock multiplier jumper options Force High-Speed Uart Clock X2, X4, or X8, J1-J3Jumper/connector locations Hardware InstallationPort Address Range Interrupt Status Register Enabling the Special RegistersBit Name Description Options RegisterRR1 RR0 Clock Rate MultiplierWindows Millennium Windows ConfigurationWindows Windows Windows Windows NT Viewing Resources with Device Manager Page DOS and other operating systems DOS and Other Operating SystemsQTPCI.EXE Basic Mode display QTPCI.EXE Expert Mode display OS/2 External Connections ESC-100D Connector Pinouts ESC-100D Channel Output ConfigurationESC-100D Output Connectors CTS DSR ESC-100M only INTA# PCI Resource Map10Specifications Maximum Load pF Data Rate 10% 15% 20% 25% Kbaud Trans Time Computer will not boot up TroubleshootingESC-100D/M Revision March