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Appendix D Troubleshooting and Common Questions
© National Instruments Corporation D-23 Serial Hardware and Software for Windows
What is the maximum baud rate supported and how can I set it?
The maximum baud rate supported is 460.8 Kbaud for RS-485 and
115.2 Kbaud for RS-232. To set the baud rate, use the SetCommState
Win32 function and pass the actual value of the baud rate in the BaudRate
field of the DCB structure.
How many interrupts are required for my serial interface?
If you have a shared IRQ card or an isolated serial card, you need one
interrupt per card. This is the hardware that currently ships with
Windows NT.
If you have an older, non-shared IRQ card, you need as many interrupts as
there are ports on the card.
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