UCOM(4) | Kernel Interfaces Manual | UCOM(4) |
The portno locator can be used to decide which port to use for device that have multiple external ports.
Note that while ucom supports the (undocumented) pulse-per-second API normally used on conventional serial ports, USB serial devices typically have a varying latency around 1 ms due to the USB frame structure.
The ttyXX devices are traditional dial-in devices; the dtyXX devices are used for dial-out. (See tty(4).)
September 29, 2016 | NetBSD 7.2 |