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Full Discussion: Serial Lines Explained
Top Forums UNIX for Dummies Questions & Answers Serial Lines Explained Post 302912179 by edfair on Wednesday 6th of August 2014 11:32:31 AM
Old 08-06-2014
Since most serial communications is via a UART this might help with the data transfer part:
Universal asynchronous receiver/transmitter - Wikipedia, the free encyclopedia

The UART voltage swings are between 0 and 5 volts. This signal is inverted and expanded to higher voltages by line drivers for transmission and inverted again and reduced to 0/5 swings by line receivers on the receiving end.

The transmitted signal starts degrading immediately and at higher transmission speeds it can be expected to be useless beyond 50 feet due to RC effects. (with a scope you would see rounding of what started as sharp shapes of voltage transitions)
 

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UPLCOM(4)						   BSD Kernel Interfaces Manual 						 UPLCOM(4)

NAME
uplcom -- USB support for Prolific PL-2303/2303X/2303HX serial adapters driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device uplcom device ucom Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): uplcom_load="YES" DESCRIPTION
The uplcom driver provides support for various serial adapters based on the Prolific PL-2303, PL-2303X and PL-2303HX USB-to-RS232 Bridge chips. The device is accessed through the ucom(4) driver which makes it behave like a tty(4). HARDWARE
The uplcom driver supports the following adapters: o ATEN UC-232A o BAFO BF-800 o BAFO BF-810 o Belkin F5U257 o ELECOM UC-SGT o HAL Corporation Crossam2+USB IR commander o Hama USB RS-232 Serial Adapter o Hamlet exagerate XURS232 o IOGEAR UC-232A o I/O DATA USB-RSAQ o I/O DATA USB-RSAQ2 o I/O DATA USB-RSAQ3 o Mobile Action MA-620 Infrared Adapter o PLANEX USB-RS232 URS-03 o RATOC REX-USB60 o Radio Shack USB Serial Cable o Sandberg USB to Serial Link (model number 133-08) o SOURCENEXT KeikaiDenwa 8 (with and without charger) o Sony Ericsson USB Cable (Susteen USB Data Cable) o Willcom W-SIM DD PHS terminal.(WS002IN) SEE ALSO
tty(4), ucom(4), usb(4) HISTORY
The uplcom driver appeared in NetBSD 1.6. This manual page was adopted from NetBSD by Tom Rhodes <trhodes@FreeBSD.org> in April 2002. BSD
November 22, 2006 BSD
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