I am trying to write something through serial port to my device. Before that, I added the data received handler to read the data when the device response with some data. The problem now is how can i check the status of the data received event? I need to know when the data received event has started or has ended before I can proceed to do some other task like check if the result is successfully receive.
View 2 RepliesI don't know why this is. I am using VB 2008.net and I am trying to receive data on the serial port.
For some reason, the following event is not executing. Here is the
[Code]...
Just simple as of right now for debugging purposes. I have a breakpoint at getMe and it doesn't hit it at all. I know for sure that the serial port should be receiving data as I am using RealTerm to monitor serial port input data before I run my program.
I'm having trouble with parsing an XML data from serial port.Actually I need to parse it automatically after all data is received from serial port.I can display all the data in a richtextbox control and all data is received perfectly but my problem isit seems that serialdata.eof function seems like it's not firing.
here's some of my code:
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'set serial port properties
With COMPort
.BaudRate = 19200
[code]....
what i need to know is how can i automatically parse the XML data from serial port after all data is received.
the problem I am having is probably mainly because of I am very new at VB.net, anyway, the thing is, I am able to receive data from microcontroller successfully. The format of the data coming from the Microcontroller is shown below
0,2 1023,1023 1023,1023 1023,1023
1,5 1023,1023 1023,1023 1023,1023
2,8 1023,1023 1023,1023 1023,1023
[code].....
I have the following code that listens to a serial port and writes the incoming data to a listview control (the serial data are a delimited string taht arrives once per second that I parse into separate listview subitems). I would like to be able to close/disconnect the serial port once a specific value in the incoming string is detected. For example, in this case one of the columns of data in the incoming string represents depth, I would like to close the serial port when the depth falls below a given number. I have tried the code below, but my program crashes on the SerialPort.CLose method.
dim m_strOBS() as string
Private Sub SerialPort_OBS_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) _
[code].....
I am current using VS2008 to write a little app to transmit hex data via the serial port to the target device and receive back data from it and display that on a text box.
The problem i am facing is receiving "read" data "hex" back from the serial port and displaying it. I am able to send data to the target system without any problem. For example, if i send this command "&H10, &H0, &H1, &H7E, &HFF, &H49" The LEDs on the system blink 10 times and it works every time. If i send this command "&H10, &H0, &H0, &HFF, &HD" i should get 5E back and I use Realterm to verify the communication and it works great. When i use my VB app it fails, instead of getting back 5E.I get "&H35, &H45, &HD, &HA" on the buffer
Private Sub sendbutton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles sendbutton.Click
Dim send_Buffer() As Byte = {&H10, &H0, &H0, &HFF, &HD}
[Code]...
I am writing a program to read data from the serial port using the data received event. But, I realised that My data received event run more than 1 time when there is a data received at the com port and this actually makes my reading command reads the wrong data. The correct procedure is whenever I send a "+++" over to my device. It should responses with "OK."message.
Why the DataReceived Event will read more than 1 time?
Below is my coding for your reference.
Public Class ControlProgram
[code].....
How do I send XML commands in vb to get data received over a serial Port?
I know the commands I'm just not sure how to send them.
I'm doing a project and want to do a graphical interface using V. Studio 2010. I want to use VB.NET as a programming language.
- Do I have to add any software to define VB.net?
- What is the function that reads the data from the serial port?
- If I want to receive more than one type of data, and I want to put/read them in separate text boxes, what is the function to filter the incoming data?
I'm trying to pass a data packet from the serial data received event.The code can capture the data without any issues.I'm spinning my wheels on getting the data packet out of the thread for further processing.[code]
View 4 RepliesI'm looking to write a few lines of code that listen to the COM port and count the number of words (as defined by the presence of a start bit) received during a set period of time.
View 1 RepliesIn my serial port application, I have my code -
Private Sub SerialPort_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort.DataReceived
Dim cnt2 As Byte
[code]....
For some packets I sent, "Error Data Received" came up. I checked BytesReceived, it was 0. My question is: since SerialPort_DataReceived processes data received, data was supposed to be received. Why the number of bytes I read was zero? BTW, when is this event accessed? it is accessed when any number of bytes received or the whole packet received?
What I am doing is creating an app to send and receive CNC programs to machine tools via the RS232 interface. At the moment I am testing the software with 2 laptops linked together through a cable I have made up. which all works. I have added a serial port to my form 1 and using the code below I can send and receive data. However with the send button I can open the comm port send the data and then close the comm port (No Problems there). With the receive button I want to open the comm port receive the data and close the comm port. The problem I have is checking when the app has finished receiving data so I can then close the comm port
Private Sub Btn_Send_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_Send.Click
Try
[Code]....
I'm new to VB, I'm now want to know how to convert received string to double. I'm receiving string like this 420.8 280.9 140.2 from serial port.. and transferred it into textbox.. I'm using following code to split string and to convert to double
[Code]...
how to convert received string to double.
I'm receiving string as 420.8 280.9 140.2 like this from serial port.. and transferred it into textbox..
I'm using following code to split string and to convert to double
Dim ReceivedText As String
ReceivedText = txtReceived.Text
Dim str_RY_1U, str_RY_1V, str_RY_1W As String
[Code]...
For calculating percentage RY_R is calculating fine.. But when it comes to RY_Y it showing error "string not in a correct format..."
im using vb 2008 to read serial port data. my requirement is as follows, when the data is received from the serial port a timer is enabling in order to blink a button saying "tank empty". so i have written the code with the aid of this forums. but now my problem is the blinking button function is not working. first i thought its cuz timer is not enabling inside the serial_dataReceived event. so i invoked a dummy label. so the timer works. but its blinking function is not working.
[Code]...
[code]...
I have a quick question regarding the serial port and timer tick event. Basically i have a micro processor connected to the PC via the serial port. With a baurd rate of 38400 set.When the PC sends the micro ":K + VBCRLF" the micro response with a string of information (ASCII encoded) and delimited with a "," and at the end of the transmission a cartridge return line feed is added.Example of sent string:
"12,1134,123,545,76,6868,34,232,1,2,3,6,7,8" These numbers are then split using the VB mystring.split(",") function into an array of strings, then the numbers are converted using ctype. After which my UI is then updated.I have Witten the code in a tick timer event using a timer count of 300ms. Although the program runs and the UI is updated i end it with lots of exception errors. I think allot of this is down to the serial port either timing out or not reading complete string.Or possibly the timer has not executed all the code before another tick event happens Even after adding a few try catch statements i am still having problems. Can anybody suggest a better way of doing it?I was thinking of using a do while loop and at the end a sleep function instead of the timer tick event.I need the speed as i am trying to read and display live data.
[code]...
i am a absolute beginner and i want to use vb to receive data from micro controller through serial port using rs232 standards, i found this code to receive the data serially, can any one tell me where should i paste this code, so that the data received will be displayed in message box.Private Sub DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) HandlesSerialPort1.DataReceived
[Code]...
I am in need of a way to check the status of a IP and Port. I've been looking around all day and still haven't found the correct thing.
View 8 RepliesI am constantly receiving 2 lines of data via my serial port, example:
GPRMC, 151243.000 , A, 3723.2475, N, 10354.0208,E,1.26, 290.95, 9.0,,,A*67
GPGGA, 151244.000, 0122.4098, N, 10354.0212, E, 1, 04, 2.1, 71.4, M, 4.3, M,,0000*5F
Apart from the starting 5 alphabets which is the message ID, the other numbers are constantly changing every second. I wish to pick out specific values from these GPRMC and GPGGA and constantly update their respective text boxes, how do I go about doing that?
The 4th, 6th & 8th values of the GPRMC message (in this case '3723.2475' 10354.0208' and '1.26')The 10th value of the GPGGA message (in this case that value is '71.4')
I am using Visual Basic express to create a serial interface to a multi-room audio controller. I have started by creating a form that can connect to the controller and I can receive data from the Controller and display Zone status, volume etc in corresponding texts box thaks to help from Stanav and Tassa in my previous thread.
My next problem is to do with receiving lots of data from the serial port and my application getting out of sync. This is mainly caused by turning the volum control as each time it is turned a little bit the controller sends out the new status of the Zone being effected
eg
****Turning Volume knob on Zone 1***
Status returned from Controller:
#Z01PWRON,SRC3,VOL05<CR>
[Code].....
I'm mohammed from Oman ,I'm visual studio.net programmer How I can Read the Data From Barcode Weight scales By Serial port and TcpIp port
View 7 RepliesI'm having a bit of an issue receiving a stream of serial data and displaying the data real-time in my GUI. I am fairly new to VB.Here's what I'm trying to achieve: I have an I2C device (bank of LED's) connected to my Arduino. Using the VB.NET (2010) GUI I request which LED I want on (via buttons) and the I2C device then sends a reply confirming which LED actually turned on (basic feedback). Ok, sounds great right? Here's where I get issues. Well when I try to read the serial data sent to VB and display the real-time stream on the GUI, a) I get a bit of a mess as an output (values are ok, just spewn across GUI) and b) when I select a new LED to turn on, the GUI data does not refresh to this change. The stream being sent from the Arduino is ok, I looked at the data in a serial monitor.
[Code]...
I am very new to this but i have with alote of help maked a program that comunicates with a relay board over rs232.
[code]...
I'd like to check to see if a serial port even exists. I know that if it doesn't, there is an error thrown when you do a port.open So, I would imagine that doing a simple IF port.isopen won't work?I looked at all the methods on the class and don't see anything obvious on how to do it.I just want to see if the hardware exists on the PC and set a boolean variable if it does when the form loads.
View 3 RepliesI am trying to get a fairly simple Serial Port program working. So simple in fact I have been bashing my head over it for quite a while.
I have a piece of equipment connected over a null modem cable. When turned on, it just starts spitting data out RS232 and I need to capture it. Hyperterminal does see the data so the USB-serial converter is working.
When I run the code snippet included, the port opens fine, but the DataReceived event never fires.
Imports System.IO
Public Class Form1
Dim WithEvents serialPort As New IO.Ports.SerialPort
[Code]....
I am running a Windows Form application, in a button called subroutine is controlling a series of events in a with a timer with 500ms ticks. There is an IO port that will send information asynchronously about another set of events that need servicing from an external device. I want to deal with the event from the IO port and return to the original subroutine, but it appears the once I complete the delegate subroutine called by the IO event, the program does not return to the subroutine that was running. Do I need to resort to polling or is there another solution through threading?
View 2 RepliesThe link below has code to connect to a modem thru the serial port but it is for an earlier version of VB. when I convert the code, it does not fully convert and has 4 errors that prevent building the project. can someone tell me what needs to be changed or added?
[URL]
Note: the error: not CLS-Compliant
I am facing problem reading data from Serial port. Actually I am connecting with the hardware device called Crimp Force Analyzer. It gives the data on hyperterminal and I have to read that data from my <acronym title="Visual Basic">vb</acronym>.net program. The data is somewhat like this:
[Code]....
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?