RS232 End Transmission Character - Put The Word "END" In The Microcontroller Code?
Oct 30, 2011
Like the title says, i have a code written in vb.net that receives data from a PIC microcontroller via rs232, but i need a way to know when te trasmission ends. I have put the word "END" in the microcontroller code so that after he sends all the data , will send the word "END" ..so i need to implement this in my vb.net code and when "END" is received to display "finish" popup message.
Imports System
Imports System.ComponentModel
Imports System.Threading[code].......
I have a problem regarding rs232-usb converter... I'm using toshiba laptop. The problem i faced is i can receive data from my microcontroller to VB but i cant send data to microcontroller... However, when i use the same VB code and same converter, i try at my friend laptop (other brand), it works... May i konw is there any other setting i need to set for my laptop??
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Private Sub MsToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MsToolStripMenuItem.Click SerialPort1.Write(1) End Sub
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3. Is there a way of stopping any transmission across the socket whilst not using it? i.e. a temporary hold
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The word may appear at the beginning, end or in the middle of a the text or sentence with in the text.
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I've already wrote a simple program for connecting to a serial port that can send data to the microcontroller, do some basic arithmatic and transmit it back to my Form. This was just to see if I could set up the conection.I have a PIC Microcontroller giving an 8-bit number thats is taken from an external sensor device.What I want to do now is to present this data from the microcontroller in a textbox as a number either in real time (as the sensor output changes) or if not possible, on request (using a button).
I have written a program in vb to serial in data from my microcontroller and it is working good except for one thing. When I try to send the number 26 to vb it just reads a blank I dont know what is going on? The data that I am reading is being converted to int16, and I am using Encoding 28591 and have also tried Encoding 1252. I have also tried a new microcontroller with no success. I dont know if this is a VB problem or a microcontroller program problem.
Dim ReceiveBuffer As String Dim portname1 As String = "Com5" ' Serial in through this port Dim portspeed1 As Integer = 19200 Dim WithEvents COMPort As New System.IO.Ports.SerialPort
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Is Win32 API a good approach for use with USB communication between VB2005 and a microcontroller with USB capability? If so where can I find these APIs?
