Using a PCs serial port ele. HOME. ELECTRONICS MAIN PAGE. ELECTRONICS PROJECTS CONTENTS Bookmark this on Delicious. Recommend at Stumble. Upon. This is your entry point to a variety of material about using the serial port of a Windows PC. Some of the information here, for instance the pin assignments, will even be useful to Linux users. Theres a table of contents in a moment. While some things here can be found elsewhere, it include this link to my essay on writing to the serial port. Once you have done that, theres also my tutorial on a program which reads from and writes to a device using the serial port. Theres more about these in the Software section of this page. While they are most immediately useful to a Delphi programmer, there is little Delphi cleverness in them. Delphi just wraps some Windows API calls, so the tutorials should be useful, whatever language you like. What follows started as a Hodge Podge of things I harvested from the internet back when I was looking for an answer to accessing the serial port from Windows 9. Over the years, some USB, LAN and TCPIP stuff has crept in. If any of those are your interest, use your browsers Find on this Page tool to search for USB. Some rough edges have been worn smooth over the years, but is still not typical of my other web pages. A detail References to me in the following do not always refer to the editor of this page. I have a much more polished page with information to help you use a parallel port. My Parallel Port FAQ Answers. Also a page specifically about the issues of connecting big computers to microprocessors like the Arduino, etc. Access 2010 Serial Port Control HtmlOr microprocessors to each other. PLEASE NOTE You CAN damage your computer if you make ill advised. Any use you make of anything you find here must be. AT YOUR OWN RISKIve also published information and an offer about a small, hobbyist friendly circuit with relays and opto isolators, which may be of interest. It is for protecting your PC if you connect things via the parallel port. Dont let the warning above worry you too much. Drivers License Photoshop Template more. I want to stress that there is a lot of fun to be had with electronics projects. Find yourself an antique PC. Get card reader and Weigand access control systems from DoorKing, EMX, HID and other great suppliers. If you cant rescue one from a dusty corner, you can buy one for almost nothing. You can use the same monitor as you use on your main machine. If you wreck the antique, it hasnt cost you much I got one, with monitor, off a sidewalk once. Table of contents, Sheepdogs Serial Port Page. Before we get to the serial port stuff, two ads from our sponsors. If you are going to use this page, you are probably not a computing novice. Ever set up a web server It isnt hard If you have an always on broadband connection, Far. Watch may be of interest. I have written pages for you explaining how to use an old Win. Win. 98 box is at from anywhere on the internet. Nothing to buy And if you connect something to that PC via its serial port, you can see the data from the serial port from afar, too. If you would be willing to help bring this information about the serial port to a wider readership, please check out my plea for translators Hardware. Much of this page is about the software aspects of talking via a serial port. Not least, if it is relevant to what you are doing, you need to know which pins carry which serial port data signals What do you connect where And what about cablesMundane though those details are. There are also other hardware issues to master. TemplateRefimprove This is a list of Internet socket port numbers used by protocols of the transport layer of the Internet Protocol Suite for the establishment of. Unlike many other virtualization solutions, its not particularly easy to connect a Windows 2008 HyperV guest to its host serial ports. Fingerprint Capture Software Download'>Fingerprint Capture Software Download. Perversely, there are. If you are coming here from one of the several great hobbyist friendly microprocessors out there, e. Arduino, I hope you will find the following useful. You probably know that a stream of serial data is, conceptually, a string of ones and zeros. In the newgroups there are many questions about serial communication so I thought make it public Its freeware. The only thing I expect from users is that they drop. Prepared by Kelly Buchanan Chief, Foreign, Comparative, and International Law Division I February 2013. Appendix Current State and Territory Firearms Legislation in. In happy innocence, you may think that zero is represented by zero volts, and one is something reasonably close to 5 volts. And the can be shown that way. But they arent always shown that way. The next few sentences may give you rising annoyance, but hang in there. Once upon a time, serial ports from PCs, i. COM1, COM2, etc, used about 1. Use this class to control a serial port file resource. This class provides synchronous and eventdriven IO, access to pin and break states, and access to serial. Cisco helps service providers build flexible, scalable, and highly secure networks. Learn how our technology can help deliver profitable growth. These examples are suitable for use in Visual Basic, Word, Excel and Access. The serial port ActiveX object can be inserted by VBA code see the first example or be. I always check those which way around is it questions each time I develop a new project. Im pretty sure it was the illogical way around Ive stated. There were reasons for these annoying, unhelpful voltage conventions, concerned with giving you reliable links. These voltages were part of what it meant when you said RS 2. Wikipedia has more on the subject. V. 2. 4 is a similar protocol. Quite a while ago, most computers serial ports were changed to use lower voltages. RS 2. 32 merely mandated below 3v and above 3 for the two states. Things were done to let you continue to attach the older equipment, but gradually everyone shifted gear to the lower voltages. Now we get to the happy ending. There are simple chips, if you want to do things the hard way, and simple small circuits if you want to go the luxury route, to translate between the RS 2. Note that we are not talking just about the change from 1. Ive explained all this in greater detail, and presented solutions for you, at my page on RS 2. TTL converters. A quick diversion for neophytes Beware RX and TX. They stand for transmit data and receive data. PCs point of view, or from the point of view of the attached device The PC transmits to the attached devices receive line. So is the blue wire the TX or the RX wire This, like the voltage levels mentioned earlier, is one of those things I re check every time. In general, you have to be careful when not sure if something is an input or an output. In this instance, you will often times get away with shorting an output to ground, because the RS 2. But dont rely on every part of your RS 2. Back to How We Do Serial Comms, the hardware And it gets better Although operating systems still have support for serial communications channels, the hardware is increasingly scarce on the PCs being sold today. One solution is a virtual serial port carried across a USB device. The hardware half of you sees a USB device, but the software side of you only has to deal with the virtual serial port created by the USB hardware. Again, Wulfden to the rescue with their BUB USB serial port. Yes, thats the same page the PA4. B is on. A left over detail Earlier I mentioned TTL in passing. Even after you have converted the 1. PCs serial port to zero volts 5v or is it the other way around, there remains a problem. How strong do they have to be In other words, how much current can run in, or out, of the wire before the 5v droops or the zero volts rises If you say that a circuit is a TTL circuit, you are making certain promises about the current levels it will demand or supply. This isnt something you need to lose a lot of sleep over if you are just using a MAX2. PCs serial port be it real, or virtual over USB to a microprocessor, e. Arduino. Just dont think that you can, for instance, connect a serial port output to a bank of 5. LEDs to get a simple high frequency light show As ever, Wikipedia can tell you more. I just didnt want you worrying about the TTL stuff that you will see when you read about the MAX2. Return to pages Table of Contents. Software. I have, after several serious attempts sprinkled across MANY years of trying, finally sussed out the underlying routines for a Hyperterminal clone. While they are most immediately useful to a Delphi programmer, there is little Delphi cleverness in them. An Error Occurred during Port Configuration. Access is Denied. So youre just cruising along, minding your own business, trying to add a new shared printer to a Windows 2. Server, when all of a sudden, you get hit with this strange error message. I mean, come on, were just trying to configure or delete a port, right One of my favorite sayings is that the only constant is change. The first time I ran into this one, it drove me a little batty. Ive been configuring shared printers on TCPIP ports for years, and never had a machine give me this error. Well, Microsoft changed this one on me. The solution is to close the Printer properties dialog, then in the Device and Printers window, highlight the printer you want to change, and click on Print Server Properties in the menu bar. Then in the next screen, click the ports tab, and Change Port SettingsNote If youre using Windows 1. How to Change Port Settings for Printers in Windows 1. Now youll have the configure port button that works. Just select your port and click Configure Port and youll have access to everything you expected. Hope that helps you out. I dont know why they made the change, but well just have to improvise, adapt, and overcome.