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Full Discussion: Writing to a Serial Port
Top Forums Web Development Writing to a Serial Port Post 302923548 by wisecracker on Monday 3rd of November 2014 02:13:43 PM
Old 11-03-2014
Remember that an RS232 port is NOT p'n'p so if there is any interruption then problems could be had.

You have learnt SW from Corona688 and HW pitfalls from me.

The real world is that your connection may be interrupted by a third party event beyond your control, (example a major underground cable assembly being damaged during roadworks), which shuts you off from access to the remote scales...

Not sure how you are going to cater for long time interruptions unless you can get the scales to store its data locally then do a dump to your machine when everything returns back to normal...

BTW these tests should initially be done locally before even attempting ANY remote tests.

This is a good starting point to find out more about the old serial port:-

RS-232 - Wikipedia, the free encyclopedia
 

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LEARN ABOUT MINIX

umct

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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