11. Serial Communications

This section answers common questions about serial communications with FreeBSD.

11.1. How do I tell if FreeBSD found my serial ports or modem cards?

11.2. Hey, I just upgraded to 2.0.5 and my tty0X are missing!

11.3. How do I access the serial ports once FreeBSD is running?

11.4. How do I configure the kernel for my multiport serial card?

11.5. I have two multiport serial cards that can share irqs. Can FreeBSD handle this?

11.6. What's the difference between ttyd1, ttyid1, and ttyld1? Or, how can I set the default serial parameters for a port?

11.7. How can I enable dialup logins on my modem?

11.8. How can I make my spare computer a dumb terminal connected to my FreeBSD box?

11.9. Why can't I run tip or cu?

11.10. My stock Hayes modem isn't supported---what should I do?

11.11. How am I expected to enter these AT commands without resorting to some DOS-based terminal program?

11.12. Why doesn't the @ sign for the phone number capability work?

11.13. How can I dial a phone number on the command line?

11.14. Great---but how can I do that without having to specify the bps rate on the command line?

11.15. I want separate entries for various hosts I access through a terminal server, but I don't want to type ``CONNECT <host>'' each time once I'm connected. Can tip do that for me?

11.16. My university has 42 billion students but only 4 modem lines. Can tip automatically try each line?

11.17. How come I have to hit CTRL+P twice to send CTRL+P once?

11.18. Suddenly everything I type is all UPPER CASE. What gives?

11.19. How can I do file transfers with tip?

11.20. Okay, how can I run zmodem with tip?