Visual Basic Serial COM Port Tutorial (Visual Studio 2010) - Part 3

download the source code:

[KelvinLeUT]

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[heberhart]

Excellent tutorial, just learning vb and I've been using RS232 for years but now to ramp up the learning curve to combine RS232 in a usable vb program

[RickFlyFish]

Liked the tutorial, Thanks Kelvin. I'm not new to VB but I am new to visual studio. Would you happen to have a tutorial on this very same thing except reading/writing to a USB device.

[KelvinLeUT]

UART would be much easier. Just get a usb-serial converter on ebay.
Then you can use the USB as a COM port for controlling the robot. That was what I used for my RC car.

[KelvinLeUT]

If you have two usb-serial converters you can communicate between any two physical devices with COM ports. But this is serial com port communication and not USB.

[linkmaster]

This is awesome. But is it possible to program something to determine the COM port and baud rate automatically? Maybe not Baud rate. But if I want to just be able to load the software on different computers how could my program determine the COM port of my STM automatically? It makes me think, how does for example my computer automatically determine the baud and COM port of my printer?

[huanhoang]

So is there any way to do USB communication using VB? Or is it a must to have the USB-serial converters? Im doing an assignment which involves controlling of a robot's movement from a computer. So I intend to use VB to communicate with a micro-controller via USB or UART.

Thank so much, please help this fellow vietnamese out :P Im an absolute beginner in VB and programming in general.

[sissokom.prodev]

i have a paid project on to send text on vfd customer display from ms access vba.

[KelvinLeUT]

you mean you want to flush the data buffer?
there is a method to easily flush the serial port buffer
just check it out on the microsoft documentation

[Jackkhan]

Hay Kevin I need you help! I want to set up school grades in like if a student got between 0 to 49 marks he is "Fail" if he got 50 to 69 he is "Pass". 70 to 89 he is " Good". If 90 to 100 he is "Distinction".... How can I do

[chaluf]

Hello Kelvin.. still got some problems to receive sth. My outputTextBox doesn´t show anything, even during running the program the COM is shown.. What could be my mistake ? THX for your nice tutorial !!!

[huanhoang]

hello Kelvin,

Can your piece of code used to facilitate USB communication between two computers? How can I select a physical serial COM port that can be used for USB communication. Do you have any idea. Thanks for your help!

[verniytur]

do you have same example with delphi7, too?i need so much about modbus in delphi7.Thanks

[michelguiraud]

Hi
Thanks for your nice tutorial. I use it to catch data from a gps device.
BUT, how to empty the TEXT, which is continuously filled with the gps data. After a moment its lenghth is too long.
Thanks if you can provide the answer.

[KelvinLeUT]

not sure what you mean

object.text = "string" instead of appendtext?

[kristofferjannotario]

hello kelvin. can you make a tutorial on how VB 2008 can read strings from a microprocessor?

[levantoan_wp]

Help me! send text file to com port (VB6) thanks ^^