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Full Discussion: Carrier Detection in FreeBSD
Operating Systems BSD Carrier Detection in FreeBSD Post 302821307 by DGPickett on Friday 14th of June 2013 11:05:14 AM
Old 06-14-2013
So what is the question? FreeBSD knows what i needs to know about peripherals and no more. When it finds a serial port, it creates a support program for it. Different rs232 ports can have different sets of leads implemented. CD may be one that the driver trusts more than say DTR or CTS.
 

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UBSA(4) 						   BSD Kernel Interfaces Manual 						   UBSA(4)

NAME
ubsa -- USB support for Belkin serial adapters SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device usb device ucom device ubsa Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): ubsa_load="YES" DESCRIPTION
The ubsa driver provides support for the USB-to-RS232 Bridge chip used by a variety of serial adapters from Belkin and other vendors. The device is accessed through the ucom(4) driver which makes it behave like a tty(4). HARDWARE
The ubsa driver supports the following adapters: o AnyData ADU-500A EV-DO modem o AnyData ADU-E100A (no EV-DO mode support) o Belkin F5U103 o Belkin F5U120 o e-Tek Labs Kwik232 o GoHubs GoCOM232 o Peracom single port serial adapter SEE ALSO
tty(4), ucom(4), usb(4) HISTORY
The ubsa driver appeared in FreeBSD 5.0. The uplcom(4) manual page was adopted from NetBSD by Tom Rhodes <trhodes@FreeBSD.org> in April 2002 and modified for the ubsa driver by Alexander Kabaev <kan@FreeBSD.org> in October 2002. AUTHORS
The ubsa driver was written by Alexander Kabaev <kan@FreeBSD.org>. BSD
November 20, 2011 BSD
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