B&B Electronics ESU2-400 - Manual - Manual (Page 29)

USB-to-Serial Adapter User’s Manual Appendix A
Rev 1.01 (February 2007) Page 25
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:
 Hardware flow control
 Horsepower of the host computer
 Quality of and length of cables
 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