Delphi 7 Serial Port Component
- Arduino Tutorial Delphi 10.2 and Serial Port. Interface created with Delphi that you can control the serial port to Arduino turning on and off a Led, handle the LCD and receive messages towards the PC. The Delphi environment with the pascal language is still current and its use in Arduino is growing more and more.
- Virtual Serial Port ActiveX Control is an advanced component which enables your application to have the ability to create an unlimited number of virtual serial port Delphi 7 serial port component. Delphi 7 serial port component.
While some things here can be found elsewhere, it include this link to my essay on. Once you have done that, there's also my. There's more about these in. While they are most immediately useful to a Delphi programmer, there is little 'Delphi cleverness' in them.
Using ActiveXperts Serial Port Component with Delphi. ActiveXperts Serial Port Component is a software development kit (SDK) that enables the user to communicate to a device over a serial interface. Such a device can be: a weight indicator, a modem, a scanner, or any other device that is equiped with a serial port.
The 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 95 programs written by me. Over the years, some USB, LAN and TCP/IP stuff has crept in.
Delphi 7 Serial Port Component
If any of those are your interest, use your browser's '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. Also a page specifically about the issues of (Or microprocessors to each other.)PLEASE NOTE: You CAN damage your computer if you make ill-advisedconnections to it. Any use you make of anything you find here must beAT YOUR OWN RISKI've also published with relays and opto-isolators, which may be of interest. It is for protecting your PC if you connect things via the.
Don't let the warning above worry you too much. I want to stress that there is a lot of fun to be had with electronics projects. Find yourself an 'antique' PC. If you can't 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 hasn't cost you much!
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(I got one, with monitor, off a sidewalk once!)Table of contents, Sheepdog's Serial Port Page:. Brief, please read??. of using serial port. What you put in a program. for the determined reader. Includes some stuff about connecting to telephone equipment. contact author, search tool, etcAds.Before we get to the serial port stuff, two ads from our sponsors.1) If you are going to use this page, you are probably not a computing novice.
Ever set up a web server? It isn't hard! If you have an always- on broadband connection, FarWatch may be of interest. I have written explaining how to use an old Win98 box (or better) to give yourself a way to monitor the premises the old Win98 box is at from anywhere on the internet.
Nothing to buy! And if you connect something to that PC via it's serial port, you can 'see' the data from the serial port from afar, too.2) If you would be willing to help bring this information about the serial port to a wider readership, please check out?Hardware.Much of this page is about the software aspects of talking via a serial port. But there are also hardware issues to master.Not least, if it is relevant to what you are doing, you need to know! What do you connect where? And what about cables?
Mundane though those 'details' are.There are also other hardware issues to master. If you are coming here from one of the several great, 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 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 aren't always shown that way. The next few sentences may give you rising annoyance, but hang in there.
It has a happy ending!Once upon a time, serial ports from PCs, i.e. The ones referred to as COM1, COM2, etc, used about 12v and negative 12v to show 'zero' and 'one'. Or was it the other way around? (I always check those 'which way around is it?' Questions each time I develop a new project.
I'm pretty sure it was the 'illogical' way around I've 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-232', a name for the commonly used serial communications protocol. Wikipedia has. ('V.24' is a similar protocol.)Quite a while ago, most computer's serial ports were changed to use lower voltages. (RS-232 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-232 requirements and the zero volts/ 5v environment that you are probably working in if you are using a microprocessor.
Note that we are not talking just about the change from 12 to 5. Relatively trivial, but from a system with negative voltages. Potentially very harmful, to the wrong circuit. To a system with no negative voltages. I've explained all this in greater detail, and presented solutions for you, at.A quick diversion for neophytes: Beware 'RX' and 'TX'.
They stand for 'transmit data' and 'receive data'. Are you looking at this from the PC's point of view, or from the point of view of the attached device? The PC transmits to the attached device's 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-232 spec says the equipment must survive such a mistake.
But don't rely on every part of your 'RS-232' circuits being fully compliant!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.
(Yes, that's the same page the PA4B is on.)A left over detail: Earlier I mentioned 'TTL' in passing. Even after you have converted the 12v/ negative 12v levels on the 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 isn't something you need to lose a lot of sleep over if you are just using a MAX232 based circuit to connect your PC's serial port (be it 'real', or virtual over USB) to a microprocessor, e.g. Just don't think that you can, for instance, connect a serial port output to a bank of 50 LEDs to get a simple high frequency light show!
Which you probably don't need. I just didn't want you worrying about the TTL stuff that you will see when you read about the MAX232.)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.
Kitty, kitty, kitty.- you are.- you.Yes, ma'am. Fish!- Morning, Father.- Morning, Catherine.I a fine fishfor the you like.That's very thoughtful.Next time,let the man it in for you.- Oh. The heiress script pdf.
The Delphi just 'wraps' some Windows API calls, so the tutorials should be useful, whatever language you like.
The buffers are ansistring, the comport devicename still being 'string' doesn't matter. I'll debug and play with more tomorrow, my only desktop with comport here refused to open a port for the remote debugger, probably too botched up by an old antivirus install. I didn't like the direction of newer tcomports, converting essentially ascii data to unicodestring. I added the relevant defines for XE to the.inc myself. But anyway, for this specialty it doesn't matter, I'll test tomorrow with newer code.–Dec 19 '11 at 21:17.