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Full Discussion: Serial Lines Explained
Top Forums UNIX for Dummies Questions & Answers Serial Lines Explained Post 302930475 by wisecracker on Sunday 4th of January 2015 06:09:18 PM
Old 01-04-2015
This gives a fair insight on the RS232 port(s).

RS-232 - Wikipedia, the free encyclopedia

Note the voltage levels:-

RS-232 - Wikipedia, the free encyclopedia

For low transfer speeds, (usually up to 9600bps on recent(ish) gear), data blocks can be sent without handshaking.
 

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UMCT(4) 						   BSD Kernel Interfaces Manual 						   UMCT(4)

NAME
umct -- Magic Control Technology USB-RS232 converter driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device umct device ucom Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): umct_load="YES" DESCRIPTION
The umct driver provides support for USB to RS-232 converters based on the Magic Control Technology USB-232 design. These devices support most of the standard RS-232 features including baud rates ranging from 300 to 115200 bits per second. However, neither hardware nor software flow control seems to be supported. Access to devices under this driver is via the ucom(4) framework and device nodes. HARDWARE
The umct driver supports the following adapters: o Belkin F5U109 o Belkin F5U409 o D-Link DU-H3SP USB BAY Hub o Magic Control Technology USB-232 o Sitecom USB-232 SEE ALSO
tty(4), ucom(4), usb(4) HISTORY
The umct driver appeared in FreeBSD 5.2. It is loosely based on the ubsa(4) driver by Alexander Kabaev <kan@FreeBSD.org> with documentation from Wolfgang Grandeggar <wolfgang@cec.ch>. AUTHORS
The umct driver was written by Scott Long <scottl@FreeBSD.org>. BSD
November 22, 2006 BSD
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