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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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genhash(1)						      General Commands Manual							genhash(1)

NAME
genhash - md5 hash generation tool for remote web pages SYNOPSIS
genhash [options] [-s server-address] [-p port] [-u url] DESCRIPTION
genhash is a tool used for generating md5sum hashes of remote web pages. genhash can use HTTP or HTTPS to connect to the web page. The output by this utility includes the HTTP header, page data, and the md5sum of the data. This md5sum can then be used within the keepalived(8) program, for monitoring HTTP and HTTPS services. OPTIONS
--use-ssl, -S Use SSL to connect to the server. --server <host>, -s Specify the ip address to connect to. --port <port>, -p Specify the port to connect to. --url <url>, -u Specify the path to the file you want to generate the hash of. --use-virtualhost <host>, -u Specify the virtual host to send along with the HTTP headers. --verbose, -v Be verbose with the output. --help, -h Display the program help screen and exit. --release, -r Display the release number (version) and exit. SEE ALSO
keepalived(8), keepalived.conf(5) AUTHOR
genhash was written by Alexandre Cassen <acassen@linux-vs.org>. This man page was contributed by Andres Salomon <dilinger@voxel.net> for the Debian GNU/Linux system (but may be used by others). Feb 2004 genhash(1)
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