Computer ports -(Serial)-

While most new computers sold in 2010, will not have serial -/- parallel ports, you might wonder why serial-ports might be of interest. Most industrial automation still use the RS-232 and RS-485 protocols for network communications, monitoring and control systems, (amongst others).

Not claiming to be an expert of these technologies, just a keen interest in placing industrial-hardware, .. juxtaposed with consumer-grade electronics.

pinouts serial port
+ pinouts serial port +

Found this nice simple explanation of ‘computer-ports’ – (Esp serial-ports) in, ..

SOURCE – Chapter 22 How Computers Work – (Millennium Edition)
Author – Ron White | Illustrated by Timothy Edward Downs
PUBLISHED: – First Printing: September 1999 –

STARTING AT THE THIRD PARAGRAPH: -[Page 209]-
Historically, the serial port is the jack-of-all-trades among computer components. It is simple in concept: one line to send data, another line to receive data, and a few other lines to regulate how data is sent over the other two lines. Because of its simplicity, the serial port has been used at one time or another to make a PC communicate with just about any device imaginable-from commonplace modems and printers to plotters and burglar alarms. And while it may be slow compared to a parrallel port, a serial port is fine for modems, that can only push signals across a telephone line serially, and for a mouse and digital camera, which dont need to send large quantities of data.

The serial port of often referred to an an RS-232 port. RS-232 is the Electronic Industries Association’s designation for a standard for how the various connectors in a serial port are to be used. But the fact that both 9-pin and 25-pin connectors are used as serial ports shows that we still have a long way to go before settling on exactly what constitues an RS-232 port. One of the drawbacks to both parallel and serial ports is that, for practical purposes, you’re limited to having two of each. The serial port functions are likely to migrate to the Univeral Serial Bus. The USB allows dozens of devices to be daisy chained from a single port.

pic-serial-port
+ pic-serial-port +

GOOGLE-IMAGE-SEARCH: – Serial Port

NOTE-1; – Click PLC (Programable Logic Controllers) – for related post in this category

NOTE-2; – the images (If clicked upon) – open in a new window (Or tabbed-page) where-upon those images were sourced.

http://en.wikipedia.org/wiki/Programmable_logic_controller

A programmable logic controller (PLC) or programmable controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or lighting fixtures. PLCs are used in many industries and machines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in battery-backed or non-volatile memory. A PLC is an example of a real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result.

RFC1925 – The Twelve Networking Truths

RFC1925 – The Twelve Networking Truths

Pasted below (In part starting on -2- ) Read-All here >>> – rfc 1925 – <<<

2. The Fundamental Truths

(1) It Has To Work.

(2) No matter how hard you push and no matter what the priority,
you can’t increase the speed of light.

(2a) (corollary). No matter how hard you try, you can’t make a
baby in much less than 9 months. Trying to speed this up
*might* make it slower, but it won’t make it happen any
quicker.

(3) With sufficient thrust, pigs fly just fine. However, this is
not necessarily a good idea.
It is hard to be sure where they
are going to land, and it could be dangerous sitting under them
as they fly overhead.

Pigs might fly

(4) Some things in life can never be fully appreciated nor
understood unless experienced firsthand. Some things in
networking can never be fully understood by someone who neither
builds commercial networking equipment nor runs an operational
network.

Approaches, perspectives & design

Scientific Vs Engineering
The scientific approach to solving problems say, “We need to understand and research MORE!”
The engineering approach to solving problems say, “Use what we know and understand NOW!”

THE INTERNET
The Internet was designed for unforeseen use. It was not designed to be perfect at what-ever its use was, .. at the time it was created. There was a choice NOT to apply perfect control. (Unlike Telecommunications systems with $$$-billing-$$$ as its core centralised feature)

fibre optic cabling http://www.nbn.gov.au/
http://www.nbn.gov.au/content/what-national-broadband-network

Networking (Connecting Linux-boxes to Micro$oft-boxes)

Samba – (And some quoted text)
The following series of quoted text are from url >>> http://www.oregontechsupport.com/articles/samba.php <<<

#1: – Microsoft came along and decided, rather than pay $20 per seat to license this technology, to reimplement DCE/RPC themselves as MS-RPC. (MY-GUESS – Approximately, this might have happened around 1997, .. but it could have been 1987, or even 1983 – IF I ever find the answer to that question I will update this little post)

#2: – While often tedious, at least the way has been generously littered with occurrences of clapping hand to forehead and muttering ‘crikey, what are they *thinking*?!’”

SOME KNOWLEDGE -/- HISTORY – (Is required)
#3: – With all things being what they were, Microsoft kept their implementation of NBT (mostly) secret. If you didn’t have a Windows machine, you were out of luck sharing files or printers with other Windows machines. Thus, the need for Samba — a way to mix Windows and Linux machines together without requiring a separate Windows server — was born.

#4: – What Exactly is Samba?
Samba is essentially a TCP/IP file and print server for Microsoft Windows clients. In fact, it can support any SMB/CIFS-enabled client. One of Samba’s big strengths is that you can use it to blend your mix of Windows and Linux machines together without requiring a separate Windows server. Samba includes support for Active Directory, unicode, new authentication and filename mangling systems, printing support, trust relationships, LDAP integration and loadable RPC modules.

I just want to connect Linux-boxes to Micro$oft-boxes, – (But that will require LOTs of effort) – hmmm – so I have produced this little post about what I have found so far, .. after approx 1 to 2 hours attempt(s) and failed configuration of this idea.

PREVIOUS POST: – Common Internet File System

GOOGLED – Windows 1.0 Timeline

THE (GUI) M$ HISTORY? – Starts approx 1983 – The Windows 1.0 product box featured the operating system’s new, tiled windows and graphical user interface (GUI).

THE DOS M$ HISTORY? – Starts approx { Insert date here _? = April 1980 according to Wikipedia }
GOOGLED – DOS Timeline

VISITED: – http://en.wikipedia.org/wiki/Timeline_of_x86_DOS_operating_systems

IF ONLY – (The OS most consumers use today (2010), .. could have been CP/M) – In 1973, Gary Kildall writes a simple operating system for Intel 8080-based computers which he calls CP/M.

Samba and Bugs – (Screen-Dump below; – taken from >>> http://samba.org/samba/docs/Samba24Hc13.pdf <<< )

Analyzing Problems

YEY – 9:15pm – Got Ubuntu 9.04 connected to Windows XP-Share – USED; The ubuntu menu ->>> Places | Connect to Server <<< – (AND; Input the appropriate configuration details, such as host-name, workgroup, share-name, account-ID -/- password) – happy now 🙂

MORE ? >>> 9:55pm – Can access the Window box from Ubuntu laptop, .. Getting XP to access ubuntu may require samba configuation, .. OR maybe terminal services might work with some minimal configuration.

THIS-SITE; – (Mentioned above) – actually provides a “nice simple” installation procedure >>> http://www.oregontechsupport.com/articles/samba.php <<<

Error code: 0x80070035 The network path was not found

We have a problem Huston! – Windows 7, will NOT connect to Server 2008 share

HERE; Is a – (Basic – setup / configure a LAN) – simple check-list that works with XP-Pro systems in a ‘work-group’

OTHER MISCELLANEOUS ITEMs; – Windows 7 is RC7100, and Server 2008 = Trial-Version – BUT that should NOT be having any bearing on this problem.

It is a strange problem, as the normal trouble shooting procedures have been completed, and firewall / configuration turned OFF, on both machines. It was working yesterday – BEFORE installing ZA, and installed a swag of Micro$oft updates – so once again, the problem can NOT be pin-pointed to one particular update / software install.

The Server-2008 – can access the laptop, and so I can work-around this issue, but it would be REALLY NICE, if I could resolve the problem. BUT it might be all for nothing, IF I have to RE-Install Windows-7 all over again – cause it IS going to expire on 1st  March 2010 (About 7 days from NOW)

GOOGLED: – “Error Code: 0x80070035” – This can be overly complicated by misinformation, but I believe that I have collected some RELEVANT facts / checks to perform when this problem arises.

#1: – http://www.techsupportforum.com/networking-forum/networking-support/175665-solved-error-code-0x80070035-network-path-not-found.html

SOLUTION – BY; johnwill – Manager, Networking Forums – S.E. Pennsylvania, US – OS: Windows 7, XP-Pro, Vista, Linux

[THIS; Seems to all make sense to me – so I have pasted below the relevant BITs, which may be useful when this problem occurs again later]

[VERBATIM-START]

Re: error code: 0x80070035 network path not found
Turn off any firewalls for debugging. If the firewall is the problem, you’ll have to configure it to allow access to “trusted zone” addresses. Note that some firewalls must be completely uninstalled to stop them from affecting your networking.

PING each computer by IP address, and if successful, PING by name. You can obtain the IP address of a computer by opening a command prompt (DOS window) and typing IPCONFIG. This should work for any Windows version. A failure here needs to be corrected before you go any farther.

Check your Services are Started on all PCs: Workstation, DHCP Client, DNS Client, Server, TCP/IP Netbios helper, Computer Browser.

All computers should be in the same workgroup for computer browsing to function properly. File & Print Sharing has to be enabled on any computer you wish to share files or printers from. You also need to actually share the resource in question from My Computer, right click on the drive/printer/folder, and select sharing.

If you encounter difficulties accessing computers that are visible in Network Neighborhood, make sure the computer being accessed has an account with the same name/password as the system connecting to it uses to login.

While the default NetBIOS setting is correct for normal network configurations, it’s possible for it to be altered, and it costs nothing to make sure it’s correct. NETBIOS over TCP/IP must be enabled for normal network browsing.

[VERBATIM – END]

[THAT; Makes a nice checklist to work through][Follow the link above, IF you need to read more about this particular issue – OR register on the http://www.techsupportforum.com/ – to post a particular OS/hardware senario]

net neutrality

GOOGLED: net neutrality (AND; Some of the links pasted below)

#1: http://en.wikipedia.org/wiki/Network_neutrality

#2: http://www.zdnet.com.au/insight/communications/soa/Net-neutrality-is-an-American-problem-/0,139023754,339292161,00.htm

#3: http://www.computerworld.com/s/article/9156578/Net_neutrality_A_complex_topic_made_simple

Friday 12, 2010 – The group, Anonymous, blocked the main government website www.australia.gov.au and www.aph.gov.au, the Australian parliament’s homepage, for a second day running in protest over controversial plans to filter the internet.

Codenamed “Operation: Titstorm”, the hacking campaign involves hundreds of people from around the world and used a technique called Distributed Denial of Service (DDoS) to jam web traffic, one of the protesters said.

The main-stream media (TV) – is not reporting on this much (Or, I have stopped watching), and so, ..  ANY good ‘Internet-Search’ reveals a wealth of information on these topics).  – I hope to follow up soon on this topic, from the technical angle, without the political-hype, lies, and deception provided by bias reporters, and hence provide my-own biased opinion.

AND – Google; Operation Tits storm

TED – 4chan’s moot takes pro-anonymity to TED 2010

In the closing minutes, moot’s purpose for speaking became clear: he insisted that anonymity is a good thing, yet we’re all giving it up voluntarily. He wasn’t talking about the NSA or tech policy or anything like that. Rather, he said sites like 4chan may go the way of the dinosaur because people are choosing to join social networking sites and persistent identity services. One of the ‘Net’s greatest strengths is disappearing as a result, but moot claimed that sites like 4chan show that a lot of good can come of anonymity, too. He seemed puzzled as to why everyone wants their identity tied to so much of what they say and do online. Do people hold back? Do they censor themselves? The power of being able to say or post whatever you want is undeniably strong, but moot didn’t speak to the dangers of anonymity.

FINALLY; – (I found these two comments – to be accurate and insightful ~ From URL; http://www.news.com.au/technology/anonymous-hackers-threaten-to-shut-down-australian-government-websites-for-months/story-e6frfro0-1225829536342

#
daniel marsh Posted at 4:41 PM February 12, 2010
Why do people keep saying it’s a child porn filter?? Conroy wants to censor sites like youtube for goodness sakes. it’s about banning anything and everything he doesn’t like not just child porn.

#
GE of Canberra Posted at 4:23 PM February 12, 2010
This just demonstrates how underprepared the government is to make sweeping changes to internet access. I predicted cyber attacks in response to the filter months ago, I can’t believe the government are so naive, and to now see them flailing around helpless against simple DDOS attacks is pathetic. This internet filter issue is waking a sleeping giant, DDOS is surely just the tip of the iceberg. The underground community have more resources and are more organised than what people give them credit for. How can they seriously complain about these attacks not being a legitimate form of political protest, when they are pushing this filter ahead without any public consultation in the first place? What goes around comes around.