B&B Electronics QSU2-400-EMB Manual de usuario descargar pdf (Pagina 29)

Quatech USB-to-Serial Adapter User’s Manual Appendix A

Appendix A

Specifications

Bus interface USB Specification 2.0, high speed 480 Mbps.

Backward compatible with USB 1.1 full speed 12

Mbps.

Baud rates Up to 921,600 bps.

Factors impacting performance include:

¾ Hardware flow control

¾ Horsepower of the host computer

¾ Quality of and length of cables

¾ Continuous or “bursty” data

Ports SSU2-100: 1

DSU2-100: 2

QSU2-100: 4

ESU2-100 8

DSU2-400: 2

QSU2-400: 4

ESU2-400 8

UARTs SSU2-100: 16550 UART with 1024-byte

secondary FIFO buffering for both

transmit and receive.

All others: Custom high-speed UARTs with

1024-byte FIFOs for both transmit

and receive. Automatic hardware

and software flow control.

Transceivers:

SSU2-100

DSU2-100

QSU2-100

ESU2-100

RS-232 Output

Voltage Swing: +/–5V min, +/–5.4V typical

RS-232 Input

Voltage Range: –15V min, +15V max

Input Threshold Low: 0.6V min, 1.0V typical

Input Threshold High: 2.4V max, 1.5V typical

Transceivers:

DSU2-400

QSU2-400

ESU2-400

RS-232, see above.

RS-422/485:

Differential Driver Output (50Ω Load): +2V min

+3.3V max

Differential Driver Output (27Ω Load): +1.5V min

+3.3V max

High Input: +2V min

Low Input: +0.8V max

Driver Rise or Fall Time:

5 ns typ, 20.5 ns max

Driver Input to Output Delay:

20 ns min, 40 ns typ, 60ns max

Receiver Input to Output Delay:

40 ns min, 70 ns typ, 100 ns max

Rev 1.01 (February 2007) Page 25

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B&B Electronics QSU2-400-EMB Manual de usuario Pagina 29

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