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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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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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