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Delphi Xe5 Serial Communication Protocols Free

Product Name	Description
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NSELib	GP Software (Thame) LTD France Name space extension library and wizard that allows production of Explorer namespace extensions
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TMS Async	tmssoftware.com Belgium High performance lightweight serial communications library with support for X,Y,Z modem protocols and terminal component
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TMS IntraWeb Component Pack Pro	tmssoftware.com Belgium Components for RAD web application development with Delphi & C++Builder and IntraWeb including advanced edits, calendars, outlookbar, grids, imagemap and much more...
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TMS mCL	tmssoftware.com Belgium Set of components for true native Mac OS-X application development
TMS Pack for FireMonkey	tmssoftware.com Belgium Set of highly configurable and styleable components for cross-platform FireMonkey application development. Target Windows 32 bit, 64 bit, Mac OS X, iOS and Android operating systems with one-codebase.
TMS Plugin Framework	tmssoftware.com Belgium Component framework for building applications with plugin architecture
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TMS Security System	tmssoftware.com Belgium User-rights management system for your Delphi & C++Builder Windows applications
TMS TAdvMemo	tmssoftware.com Belgium Highly configurable syntax highlighting memo control with code-folding, autocompletion, bookmarks & source code container
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TMS TPlanner / TDBPlanner	tmssoftware.com Belgium Award-winning highly configurable planner/scheduler component for interactive scheduling applications.
TMS VCL Subscription	tmssoftware.com Belgium 2 year subscription to all our current & future VCL products for Windows application development.
TMS WebGMaps	tmssoftware.com Belgium VCL Component with extensive configurability for integrating Google Maps in Delphi & C++Builder
TMS WebOSMaps	tmssoftware.com Belgium Mapping component to integrate, display & control OpenStreetMaps in VCL Windows applications.
TMS Workflow Studio	tmssoftware.com Belgium Add workflow/BPM (Business Process Management) capabilities to your applications. Build workflow definitions/flowcharts, run workflows, create tasks for multi-user environment, follow-up tasks, keep log tracking of task changes and more. Workflow Studio in
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VoiceMarkupKit	Chant Inc. United States Fine-tune Speech Synthesis with Text-to-Speech Markup
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X-DBData Components	X-Files Software Poland X-DBData Components package was designed to can directly use any indexed data structures with db-aware data components, especially with our TXDBGrid component.
X-DBGrid Component	X-Files Software Poland X-DBGrid Component Package contains a set of professional advanced components designed for Delphi and C++Builder. X-DBGrid Component Package is a main part of X-Files Components Package.
X-Files Components	X-Files Software Poland X-Files Components package contains a full set of advanced components designed for Delphi and C++Builder.
XE5 Plus Pack	JED Software Australia An evolving collection of IDE Experts, Component Editors, Property Editors and Utilities for Delphi XE4.
ZieglerCollection one	ZieglerSoft Denmark ZieglerCollection one' is a collection of Delphi 16/32-bit components together with a lot of functions and procedures. The collection is made to make your life as a Delphi or C++Builder programmer a lot easier
ZipForge	ComponentAce Limited Russian Federation ZipForge is a free for personal use ZIP Delphi component.

115 product(s) found.

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I’m working on with an embedded device that is connected to PC using RS232.

I need to do a software to communicate with this embedded device.

I program in Delphi. I never used to use object-oriented in the past. But I'm trying to change this.

I am not able to think in an object oriented manner to solve this problem.

I have this protocol:

where:

The software computer will send a command via serial, and the device will answer, using the same protocol.

For example:

I have to send a file stream to the device.

I'd like to obtain suggestions and/or examples of the best way to implement this in an object oriented manner. I'd like to be able to do unit-test too.

Thanks

BalusCDaniel GrilloDaniel Grillo

3 Answers

Serial Communication Software

You should look at other serial send/receive communication models, such as HTTP. In .NET, the HTTPWebRequest object is where you gather together all the pieces of info to be sent across the wire - including command (HTTP METHOD: GET, PUT, POST, etc) and byte stream. The HTTPWebRequest object (and the HTTP stack) internally deals with the 'paperwork' of calculating checksums of the data, chunking large data into smaller packets, etc. All your code has to do is construct the request object, set the command, assign a stream of data to the request object's property, and send.

Another reason why you should look at existing communication object models like .NET HTTP is that serial comms are generally asynchronous from the perspective of your host CPU. A lot of CPU time can pass by while transmitting the characters of the request on the serial port, and while waiting for the response. Use an async model for your request/response so that you don't block the calling thread and potentially freeze your UI.

To continue the .NET HTTP example, HTTPWebRequest has a GetResponse method which sends the request and will block the calling thread until a response is received. HTTPWebRequest also has a BeginGetResponse()/EndGetResponse() pair so that you can send the request and provide a callback to be executed when the response arrives at some later time.

Even if your immediate design is ok with a thread-blocking synchronous call model, you should at least investigate asynchronous coding patterns and consider implementing your object as such. You can always call an asynchronous method in a thread-blocking synchronous way, but it's much more difficult to call a synchronous method in an asynchronous way. Invest a little time now to give yourself more options down the road.

dthorpedthorpe

Well, I guess there are as many solutions as there are programmers. Without knowing more about your system I would probably go with this approach:

Create a base command class, lets say; TBaseCommand. Define your common interface at this level, like Send(), Receive(), Run() etc...

Only fill in code for functions common for all commands, such as sending, receiving etc...

Functions that will differ in execution are made virtual to be defined in the next layer.From this derive a new class for each command and fill in the command specific code, such as Run().

Having a Run() will easily allow you to simulate your commands on screen by overriding the Run() function.

, and are your transport protocol and should be applied and stripped of by your communication interface (separate protocol class?). Your protocol class can also handle checksum errors and try to resend etc.. If it can't be solved, signal error.

This was only a few things on top of my head with your limited description...

Max KiellandMax Kielland

Sort of hard to answer but from the small amount of info I have, here's how I'd do it:

Either you class that knows how to serialize themself or you use the visitor pattern for serializing. This has the advantage of decoupling your data from the serialization and let you implement other serialization mechanism more easily.

So I'd have a Data class, a Command class which contains a collection(choose your preferred container) of Data. The Command class would likely handle the checksum calculation through a public method. I would also have a communication class to encapsulate the Command and begin and end the communication. Then I'd have a class responsible for interfacing with the serial port which would have a Send method that would take a reference on the communication class.

From the available info, that's what I can come up with design-wise.

Delphi Xe5 Serial Communication Protocols List

As for unit test, with a good design, you should be able to unit test almost everything. Remember to use stubs, you don't want to hit that serial port during testing so make a fake serial communication class that writes in a string for example and compare the outputted string to the expected value specification wise.

Eric FortinEric Fortin

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