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Serial Lines Explained

 
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# 8  
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

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