Comm Port And HEX Data

Jan 27, 2010

Basically I need to send the hex command FA through a COM port.

I have added the com port and set the baud etc and all seems to be working well there. I am just a little unsure how to send the correct hexadecimal command. For example,

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
SerialPort1.Open()

[Code].....



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I'm currently working on a project where I am transmitting data from a comm device via the serial port and resorting the raw data (in binary) to its respective ascii values. The problem I'm facing is determining the most efficient method to accomplish my goal. Essentially, I have 68 bytes coming in, the first and second bytes represent the page and packet number and the data itself ranges from 3 to 64, the remaining for my checksum.

What I am needing to do is, grab 50 consecutive bytes per variable in my array, and that is where I'm confused. I have easily pulled my 3-64 bytes and stored that data to a string. I just don't know the most efficient method to accomplish my goal. Should I write directly to file all my data, as there are like 8 pages, of 128 packet data. [Code] I can capture the the first 50 by using a for-loop easily, but what would be the preferred method to track what data chunk I've taken? The more I think about it, I think I may just want to write to file, all my data, and then just take them back to back in 50 byte chunks. Is that the most efficient method?

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[code].....

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Now I know whats going to happen, I will post a request for code syntax and one of the admins is going to say that I need to post the code I already have. The code I already have is irrelevant to what i wish to do. So, continuing on; I have a micro controller that i wish to send commands to it in HEX data type. Communication is via the serial port RS232. (well technically its through the USB to serial converter)Steps:

1) Sending a "001" tells the micro controller to await instructions as to what to set the duty cycle to

2) The data that follows i.e." 050, 010, 185 " will be added to 400 (by the micro controller) to come up with a duty cycle based on a 10 bit resolution of 0-1024. I am only going to be using the range of 401- ~500.

I can communicate with the micro controller via hyper terminal. Using the Alt + #keys method I can transmit data to the micro controller, and this is what i with to do with vb.net.[code]

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I have an older VB6 application which uses a scanner on the COMM port and does the following... (I have been tasked with re-writing it in ASP.NET (VB)...

OLD APPLICATION...

1.  reads a Scanner and loads the data onto the PC

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I only get this when I use the radios and not when I use a direct cable. I wonder if it has something to do with other bluetooth devices nearby trying to communicate with mine. I've used the .NET Framework 2.0 Confuration tool to adjust the zone security to give full trust to MyComputer, so I don't think it has to do with security, but I'm really going beyond my area of expertise here. I don't know what's going on.

[Code]...

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I did a search for "How do I implement Serial COM Port communications? and found a response by Xiaoyun Li which was last posted on April 10, 2009. Xiaoyun's response included sample code. My intent has been to get a clean compile on the sample code, then test it, then expand the code into a real application. I am down to a single error message, which I can't figure out how to resolve: "Method 'Public Sub DoUpdate()' does not have a signature compatible with delegate 'Delegate Sub EventHandler(sender As Object, e As System.EventArgs)'." [code]I marked where the error occurs in the code with *** to the right of the error line.The code is attached to a simple form, Form1 which contains a single text box, TextBox1.It appears to me that the code needs a Delegate statement, but I can't figure out how to code it or where to put it.d.

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I am getting scale values from a comm port into a richtextbox control, now as long as the connections and the scale is working great scale readings continuously flow into the control all the time, however when the connections or the scale is turned of the label that displays the weight will give a message saying error.

After 5 seconds I want to be able to give the operator the choice to take scale readings manually. This is my code so far.

Private Sub tmScaleTimer_Tick(sender As System.Object, e As System.EventArgs) Handles tmScaleTimer.Tick
If rtbDisplay.Text.Length = i Then

[Code].....

how do I restart the timer if the interval has elapsed

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my program functions similar to that of TeraTerm. an opensource hyperterminal program written in C++ but i decided to do one for vb.net

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[Code]...

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You send The Config command to the modem and wait X ms for the confirmation reply (Single Byte), If no reply, send a Wake up command, wait X ms and send Config command again. Once confirmed that the modem is in config mode, send parameters, Waiting for confirmation of each one. Once config is set, send the 'Return to normal mode' command and wait for confirmation. [Code]

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I have a thread executing the following:

vb
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[Code]...

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here is the

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[Code]....

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