Start a program with a signal from serial port
Hi, my program need to continue when it's gets a signal from the
serial port, I've understand that i need to use Java Communications 3.0 API.
couldn't install it.
when i import, in my program, javax.comm.* it can't be resolve.
thank for eny help..:-)
Glad you got it to work. I would only say 2 very important things:
1) Do not use an IDE as long as you can't code using notepad and command console and don't understand the concept "classpath". Now you've to learn both the IDE and the Java language basics. This is going to take a longer time than when you learn it one by one.
2) You should NEVER place any 3rd party libraries in JRE/lib or JDK/bin. This is receipt for major future troubles. You should define the classpath yourself. You shouldn't misuse the default classpath.
Similar Messages
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Java program to receive byte from serial port
hello everyone, i am recently working one a project which require communication between pic16f877 and PC. My pic continuiously measure a voltage and send the result (a byte ranging from 0 to 255) to the rs232 port. One the pc side, my java program keep reading the serial port and it works for values 0~127 and 160~255. But if the byte value is between 127 and 160, it cannot received correctly, i get something like 375,8224,or even 65532 etc(no obvious path but more likely to be 300+,700+,8000+ or 65500+). I have been trying very hard to solve this and i think the problem is due to the pc software. I am feeling so frustrated and any suggestion will be much appreciated.
p.s. : i used Bufferedreader.read() in my program
--mengyaofumengyao wrote:
hello everyone, i am recently working one a project which require communication between pic16f877 and PC. My pic continuiously measure a voltage and send the result (a byte ranging from 0 to 255) to the rs232 port. One the pc side, my java program keep reading the serial port and it works for values 0~127 and 160~255. But if the byte value is between 127 and 160, it cannot received correctly, i get something like 375,8224,or even 65532 etc(no obvious path but more likely to be 300+,700+,8000+ or 65500+). I have been trying very hard to solve this and i think the problem is due to the pc software. I am feeling so frustrated and any suggestion will be much appreciated.
p.s. : i used Bufferedreader.read() in my program
--mengyaothis may not matter in your case - but don't use a Reader, use a Stream (BufferedInputStream maybe) -
my up to date iMac can not read the lightroom 5 installation dvd I received for christmas, the dvd player works fine with other dvd's, is there a way to download the program with the dvd's serial number?
No need to worry about the disk version. You would just have to install an update anyway as soon as it was installed. Download from the link provided below and use the serial number you have to activate.
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LV acquire the print information from the embed board with Linux system through serial port
I want to acquire the print information by LV from the embed board with Linux system through serial port, like the window hyperterminal tool?
I try to use VISA serial config function to achieve it ,but lost and prompt that is error like attachment.
I can't sure that my idea is reasonable.
help me
thanks a lot!I ended up finding the answer to my problem. After pointing a client directly at one of the DPS systems, I saw the following error in the logs:
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Problem while reading data from Serial Port
Hi All,
I am facing some problem while reading data from Serial Port.
As per the requirement I am writing the data on Serial Port and waiting for response of that data.
Notification for data availabilty is checked with method public void serialEvent(SerialPortEvent event) of javax.comm.SerialPortEventListener.
When we are writing data on the port one thread i.e. "main" thread is generated and when data availability event occures another thread "Win32SerialPort Notification thread" is generated. This creates problem for me as we can't control thread processing.
So can anybody pls explain me how to overcome this problem?
Regards,
NehaMy Problem is:-
I am simoultaneouly wrting data on port & reading data from port.
First I write data on port using outputStream.write() method. Now when target side sends me response back for the request on serial port DATA_AVAILABLE of SerialPortEventListner event occured,we are reading data from serial port.Now till the time we didn't get the response from target next command can't be written on the serial port. When we are writing data on port main thread is executed.Now my problem starts when DATA_AVAILABLE event occured.At this point another thread is created.Due to this my program writes data of next command without reading response of previous command.To solve this prob. I have used wait() & notify() methods as follows.But again due to this my pc hangs after execution of 2 commands. (PC hang in while loop in a code provided below.)
From SOPs I could figure it out that after 2 commands we are not able to write data on serial port so DATA_AVAILABLE event doesn't occure n pro. goes in wait state.
Can anybody help me to solve this issue.
Neha.
Code:
public void serialEvent(SerialPortEvent event)
switch (event.getEventType())
case SerialPortEvent.BI:
case SerialPortEvent.OE:
case SerialPortEvent.FE:
case SerialPortEvent.PE:
case SerialPortEvent.CD:
case SerialPortEvent.CTS:
case SerialPortEvent.DSR:
case SerialPortEvent.RI:
case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
break;
case SerialPortEvent.DATA_AVAILABLE:
try
dataThread = Thread.currentThread();
dataThread.setPriority(10);
dataAvailable = true;
byte[] tempArray=new byte[availableBytes];
inputStream.read(tempArray);
catch (IOException io)
SOP(io, "Error in serialEvent callback call for event DATA_AVAILABLE");
public void writetoPort(byte[] data) throws IOException
outputStream.write(data);
while(finalTimeOut >= actualTime)
if( ! dataAvailable)
actualTime = System.currentTimeMillis();
else
synchronized (mainThread)
mainThread = Thread.currentThread();
mainThread.wait();
public void sendDatatoUser(byte[] b) throws Exception, HWCCSystemFailure
obj.returnData(b);
synchronized(mainThread)
mainThread.notify();
-
How to get data from serial port to GUI textArea
From Serial Port.....
Messages from base (always 5 bytes):
0xAA, 0, 0, 0, 0xBB - IDLE Mode
0xAA, 0, 0x80, 0x80, 0xBB - Question Mode
messages from terminal (always 6 bytes):
0xAA, a, b, c, chksum, 0xBB
where chksum = a+b+c;
a = address (0-250)
the 2 MSB's of b represenet the answer:
0 0 - A
0 1 - B
1 0 - C
1 1 - D
the 6LSB's of b and 8bits of c is the time for answer, in milliseconds.
(0-16384 milliseconds)
I have VB Code for that but I want the same thing in Java ...
Can any one help me?
Here's VB Code..
VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1
BorderStyle = 1 'Fixed Single
Caption = "Aakar GUI"
ClientHeight = 4665
ClientLeft = 60
ClientTop = 375
ClientWidth = 6105
LinkTopic = "Form1"
MaxButton = 0 'False
MinButton = 0 'False
ScaleHeight = 311
ScaleMode = 3 'Pixel
ScaleWidth = 407
StartUpPosition = 3 'Windows Default
Begin VB.CommandButton cmdPort
Caption = "Open Port"
Height = 375
Left = 120
TabIndex = 4
Top = 600
Width = 1455
End
Begin VB.ComboBox cmbPort
Height = 315
ItemData = "Form1.frx":0000
Left = 120
List = "Form1.frx":0016
Style = 2 'Dropdown List
TabIndex = 3
Top = 120
Width = 2895
End
Begin VB.CommandButton cmdEnd
Caption = "End"
Height = 495
Left = 1560
TabIndex = 2
Top = 1320
Width = 1215
End
Begin VB.CommandButton cmdStart
Caption = "Start"
Height = 495
Left = 120
TabIndex = 1
Top = 1320
Width = 1215
End
Begin VB.TextBox txtMessage
Height = 2040
Left = 119
MultiLine = -1 'True
ScrollBars = 3 'Both
TabIndex = 0
Top = 2475
Width = 5848
End
Begin VB.Timer tmrRead
Enabled = 0 'False
Interval = 1
Left = 2040
Top = 600
End
Begin MSCommLib.MSComm MSComm1
Left = 3120
Top = 360
_ExtentX = 1164
_ExtentY = 1164
_Version = 393216
DTREnable = 0 'False
ParityReplace = 45
SThreshold = 1
End
Begin VB.Label Label5
Caption = "Result Data:"
Height = 375
Left = 120
TabIndex = 5
Top = 2115
Width = 1320
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim PortIsOpen As Boolean
Dim Answers(4) As String
Dim RejectKeystroke As Boolean
Private Sub cmbPort_Change()
Debug.Print cmbPort.ListIndex
End Sub
Private Sub cmbPort_Validate(Cancel As Boolean)
'Cancel = True
End Sub
Private Sub cmdEnd_Click()
MSComm1.Output = "e"
txtMessage.Text = ""
End Sub
Private Sub cmdPort_Click()
On Error GoTo ErrorHandler
If cmbPort.ListIndex < 0 Then Exit Sub
If PortIsOpen Then
cmbPort.Enabled = True
MSComm1.PortOpen = False
PortIsOpen = False
cmdPort.Caption = "Open Port"
cmdStart.Enabled = False
cmdEnd.Enabled = False
Else
MSComm1.CommPort = cmbPort.ListIndex + 1
cmbPort.Enabled = False
MSComm1.PortOpen = True
PortIsOpen = True
cmdPort.Caption = "Close Port"
cmdStart.Enabled = True
cmdEnd.Enabled = True
End If
Exit Sub
ErrorHandler:
Debug.Print Err.Number
Debug.Print Err.Description
MsgBox Err.Description, vbExclamation Or vbOKOnly, "Error opening port"
cmbPort.Enabled = True
PortIsOpen = False
cmdPort.Caption = "Open Port"
cmdStart.Enabled = False
cmdEnd.Enabled = False
End Sub
Private Sub cmdStart_Click()
MSComm1.Output = "s"
txtMessage.Text = ""
End Sub
Private Sub Form_Initialize()
Dim tmp As Variant
tmp = InitCommonControls
End Sub
Private Sub Form_Load()
Answers(0) = "A"
Answers(1) = "B"
Answers(2) = "C"
Answers(3) = "D"
'MSComm1.Settings = "9600,n,8,1"
''MSComm1.Settings = "115200,n,8,1"
'MSComm1.PortOpen = True
On Error GoTo ErrorHandler1
MSComm1.CommPort = 1 ' comm port 1
MSComm1.RThreshold = 1 ' use 'on comm' event processing
MSComm1.Settings = "9600,n,8,1" ' baud, parity, data bits, stop bits
MSComm1.SThreshold = 1 ' allows us to track Tx LED
MSComm1.InputMode = comInputModeText 'comInputModeBinary ' binary mode, you can also use
' comInputModeText for text only use
PortIsOpen = False
cmbPort.ListIndex = 0
' open the port
MSComm1.PortOpen = True
cmbPort.Enabled = False
PortIsOpen = True
cmdPort.Caption = "Close Port"
cmdStart.Enabled = True
cmdEnd.Enabled = True
Exit Sub
ErrorHandler1:
Debug.Print Err.Description
PortIsOpen = False
cmbPort.Enabled = True
cmdPort.Caption = "Open Port"
cmdStart.Enabled = False
cmdEnd.Enabled = False
End Sub
Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
If MSComm1.PortOpen Then MSComm1.PortOpen = False
End Sub
Private Sub lblOption_Click()
End Sub
Private Sub MSComm1_OnComm()
' Synopsis: Handle incoming characters, 'On Comm' Event
' Description: By setting MSComm1.RThreshold = 1, this event will fire for
' each character that arrives in the comm controls input buffer.
' Set MSComm1.RThreshold = 0 if you want to poll the control
' yourself, either via a TImer or within program execution loop.
' In most cases, OnComm Event processing shown here is the prefered
' method of processing incoming characters.
Dim i As Long
Dim sBuff As String ' buffer for holding incoming characters
Const MTC As String = vbCrLf ' message terminator characters (ususally vbCrLf)
Const LenMTC As Long = 2 ' number of terminator characters, must match MTC
Dim iPtr As Long ' pointer to terminatior character
' OnComm fires for multiple Events
' so get the Event ID & process
Select Case MSComm1.CommEvent
' Received RThreshold # of chars, in our case 1.
Case comEvReceive
' read all of the characters from the input buffer
' StrConv() is required when using MSComm in binary mode,
' if you set MSComm1.InputMode = comInputModeText, it's not required
'sBuff = sBuff & StrConv(MSComm1.Input, vbUnicode)
'If Len(txtMessage.Text) > 4096 Then txtMessage.Text = ""
sBuff = MSComm1.Input
Dim ch As String
Dim PacketStart As Boolean
Dim PacketLength As Integer
Dim Packet() As String
PacketStart = False
PacketLength = 0
While (Len(sBuff) > 0)
ch = Left(sBuff, 1)
If (ch = Chr(&HAA)) Then PacketStart = True
If (ch = Chr(&HBB)) Then PacketStart = False
If (ch <> Chr(&HAA) And ch <> Chr(&HBB)) Then
PacketLength = PacketLength + 1
ReDim Preserve Packet(PacketLength)
Packet(PacketLength) = ch
End If
'txtMessage.Text = txtMessage.Text + Format(Hex(Asc(ch)), " @@")
sBuff = Right(sBuff, Len(sBuff) - 1)
Wend
If (PacketLength = 3) Then
Debug.Print "Command packet recieved"
'txtMessage.Text = txtMessage.Text + vbCrLf + "Address =" + Str(Asc(Packet(1)))
'txtMessage.Text = txtMessage.Text + vbCrLf + "Address =" + Str(Asc(Packet(2)))
End If
If (PacketLength = 4) Then
Debug.Print "Response packet recieved"
txtMessage.Text = txtMessage.Text + "Address =" + Str(Asc(Packet(1))) + _
" Answer = " + Answers((Asc(Packet(2)) And &HC0) / 64) + _
" Time =" + Str((Asc(Packet(2)) And &H3F) * 256 + (Asc(Packet(3)))) + "mS" + vbCrLf
'txtMessage.Text = txtMessage.Text + vbCrLf + "Address =" + Str(Asc(Packet(1)))
'txtMessage.Text = txtMessage.Text + vbCrLf + "Option =" + Str((Asc(Packet(2)) And &HC0) / 64)
'txtMessage.Text = txtMessage.Text + vbCrLf + "Time =" + Str((Asc(Packet(2)) And &H3F) * 256 + (Asc(Packet(3))))
End If
If (PacketLength <> 4 And PacketLength <> 3) Then Debug.Print "Unknown packet of length" + Str(PacketLength) + " recieved"
txtMessage.Text = txtMessage.Text + vbCrLf
' An EOF charater was found in the input stream
Case comEvEOF
DoEvents
' There are SThreshold number of characters in the transmit buffer.
Case comEvSend
DoEvents
' A Break was received.
Case comEventBreak
DoEvents
' Framing Error
Case comEventFrame
DoEvents
' Data Lost.
Case comEventOverrun
DoEvents
' Receive buffer overflow.
Case comEventRxOver
DoEvents
' Parity Error.
Case comEventRxParity
DoEvents
' Transmit buffer full.
Case comEventTxFull
' Unexpected error retrieving DCB]
Case comEventDCB
DoEvents
End Select
End Sub
Private Sub tmrRead_Timer()
'MSComm1.Output = vbCrLf + vbCrLf
'MSComm1.Output = Chr(128)
End Sub
Private Sub txtMessage_KeyDown(KeyCode As Integer, Shift As Integer)
If Shift = 2 Or Shift = 4 Then RejectKeystroke = False Else RejectKeystroke = True
End Sub
Private Sub txtMessage_KeyPress(KeyAscii As Integer)
If RejectKeystroke Then
KeyAscii = 0
End If
End SubThanks in advance..I want to replicate the entire VB program as Java Program.
This has to be included in my project which i am doing in java. -
Read data from serial port or TCP port of frontend PC
Hello Friends,
I have requirement to read data from device connected to frontend PC which will provide meter reading data.
Vendor has given me two option.
1. Device can be connected to seiral port and data transfer will be done through MODBUS RTU protocol.In that case data need to capture from serial port.
2. Device can be connected to TCP port and Socket program can be provided for data transfer. In that case SAP will act as client and communicate with TCP port.
There will be multiple workstation with individual meters connected to them.
I am aware of text file interfacing through front end tools using custom code using VB,JAVA or others.
Is there any solution availble to achieve above things using ABAP other than text file , like direct communication?
I am using ECC 6.0.Hello,
Socket programming in not available on ABAP, but you may use RFC for the same.
Use the below links for more details
[Link 1|http://help.sap.com/printdocu/core/print46c/en/data/pdf/BCFESDE2/BCFESDE2.pdf]
[Link 2|http://forums.sdn.sap.com/thread.jspa?threadID=1820233]
Regards,
Abhishek -
Reading a char array from Serial port
Need help!
Hi, I've got the following problem - I wanna read a input stream from serial port and I use at the moment the following method (reading bytewise):
public String receiveText (){
byte ch;
fStrBuf.delete(0,fStrBuf.length()); //clearing the buffer
try{
do {
ch = (byte) fPortInStream.read();
fStrBuf.append( (char) ch);
while ( (byte) ch != 0x03); //The end of frame byte
}catch(IOException ioe) {};
return fStrBuf.toString();It works pretty well, but disadvantage is that it's too slow to use it in the thread (at least I think so)
How can I change it to read all available data from the port (or simply faste). I don't need event listeners, because it's a request-responde communication.
I tried smth. like this
byte[] readBuffer = new byte[20];
try {
while (fPortInStream.available() > 0) {
int numBytes = inputStream.read(readBuffer);
fStrBuf.append(readBuffer);
} catch (IOException e) {}
return fStrBuf.toString();But it doesn't seem to work :-(May I suggest that you use StringBuilder rather than StringBuffer. It has less overhead because it is not threadsafe. I do synchronous serial port stuff with Opto 22, and i have no listeners enabled.
Appending to the String(Builder/Buffer) directly from the byte buffer mangles it. So I use a string (ugh). With the Opto22 brain boards, i am looking for a carriage return as a term char. It either finds it or times out.
This is the best i have come up with so far:
StringBuilder response = new StringBuilder();
String data = new String();
long msTimeOut = 2000;
public void getResponse () throws IOException {
byte[] readBuff = {0};
int charAvail;
response.delete(0,response.length());
long ts = Calendar.getInstance().getTimeInMillis();
try {
while ( readBuff[readBuff.length-1] != '\r' ) {
charAvail = inputStream.available();
if ( charAvail > 0 ) {
readBuff = new byte[charAvail];
inputStream.read(readBuff);
response.append(new String(readBuff));
if ( Calendar.getInstance().getTimeInMillis() > (ts + msTimeOut) ) {
response.delete(0,response.length());
response.append("TIMEOUT");
break;
} catch (IOException e) { e.printStackTrace(); throw e; }
data = response.substring(0);
} I just starting writing Java about 4 days ago, so caveat emptor. -
Unable to capture data from Serial port using LVRT2010 in single core pentium 4 machine
I am using application written in Labview using windows Labview
Runtime environment 2010. Application creates a tunnel to intercept data from
Serial port.
My problem is, Currently, I am using single core Pentium
processor. When I am trying to intercept the data between COM1 and COM7 (COM 7
is a virtual port) it is not able to capture data.
When I am running Labview RT environment using dual core
processor machine it is running normally. I wonder whether it could be the compatibility issues with
single core Pentium processor.Hi Magnetica
Are both of the machines running the same runtime engine,
drivers ect?
Have you had RT applications running on this
machine before?
Is the development computer a 64bit machine?
The processor is a supported model (See link below).
http://zone.ni.com/devzone/cda/tut/p/id/8239
Regards
Robert
National Instruments UK & Ireland -
Hi, I have a trouble.
I need to send a signal to serial port to pilot a relè.
I can't find how to send a Vcc signal for some second on a pin in java.
Someone have an idea?
Thanks a lot!
Edited by: Alberto.Marcigaglia on Aug 29, 2008 2:27 AMThere are many results from the search below:
http://www.google.com/search?q=java+serial+port
I suggest that you use the 3-rd party RXTX package rather than the obsolete javax.comm package. There are a number of very detailled posts in these Sun forums regarding the installation and use of RXTX - search for them. -
How to save a datas from serial port?
How to save a datas from serial port?
Hi
I need some help about rs-232 communication. I want to make a vi witch can do this things:
-read a txt file (to simulate a serial port like when the datas are coming)
i will get 3 different data in serial port (like this: 121 213 135)
i want to save in a txt file what datas get my vi
so
-write in a txt file or draw in a diagram (or both)
so my problem is: read in serial port and save in a file and draw a diagram.
if anybody can help pls HELP ME because im a beginner in this problem.
I already do something but Im not sure that good.
Thx for all. -
Count time between 2 readings from serial port... help!.
Hi guys,
I am using my application to get the readings sent by microcontroller from serial port. It works perfectly. But i have the problem, the pic uses 16bits counter, and sometimes i measure frequency lower than 15hz (65535-->16bits). Thats why I thought to measure the time between each pulse that it recieved in serial port. So i could multiply the reading about the time which spend in arrive to serial port. I know if any pulse spend more than 15hz, i should add 65535 to this reading.
Then, the idea is count the time spent between each reading in serial port. SInce pics count and later send each turn.
I dont know if it is possible, and exist any easy way.. Can ayone help me?.
I would like to see any example of it, always it is possible.
Regards, Fonsi.
Attachments:
capture.GIF 19 KBYou're not going to be able to get even close to 1 usec resolution using the built-in time functions though I don't see any of those in your attachment. The windows clock is simply not that accurate. If you need to precisely time your serial reads you might want to look at using the timed loop. You can set the period of that to 1 msec.
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Program to write signals from PXI 5105 using labview 2011
Hello
I am new in using labview. I need help in writing program to continuously record the signals form PXI 5105 using LabVIEW 2011. I prepared a program using help examples. It is recording the signal using pxi 5105 into the file after trigger. I tested the code using waveform generator with -100mV to 400mV, 1 kHz, sine wave. I have also attached the waveform of signal from the excel file recorded by the program. I have following queries
(i) Is the program correct to continuously record the triggered signals. Have I used the while loop correctly?
(ii) why some part in waveform is missing.
(iii) What should be the value of millisecond multiple ( I used zero)
I want to use above program for strain gauge signal measurement. Where I have to record the data at 20Ms/sec sample rate for 1 milli second after trigger.
thanks
Attachments:
Signal recording programme.vi 85 KB
recorded_signal.png 38 KBHi,
Sorry but I've only got LabVIEW 2010 so I can't open your file. If you can post a 2010 version I can take a look.
vinod_p wrote:
(iii) What should be the value of millisecond multiple ( I used zero)
If you are talking about the "Wait until Next ms Multiple" function then "Wiring a value of 0 to the milliseconds multiple input forces the current thread to yield control of the CPU." (from the context help for the function - press <ctrl>+h). Is this the behaviour you want?
Normally the ms multiple function is used to synchronise loops as it waits until the next multiple (be it 10ms or 10s) before continuing the loop.
-CC
"If anyone needs me, I'll be in the Angry Dome!" -
Starting Java Program with a bash Shell script
Hi !
I know this is a Linux query but I am putting it on this site to get different answers.
I want to start my Java program with a shell script. Can anybody give me a proper script to start my Java program?
I am using RH Linux 7.3 and JDK 1.4.
Can I start the Java program without starting the terminal? Just like the Sun One Studio4 'runide.sh' script.
Please help.
Bye Niteenassuming you have your PATH and CLASSPATH variables set correctly, your script should look like this:
#!/bin/bash
cd <project_dir>
java <class> &
example:
#!/bin/bash
cd ~/projects
java project1.main_package.MainClass &
of course you could add some more elaborated stuff like compiling files before running the program, etc.
if you dont like terminals, try running "nautilus" (it's like Windows Explorer). i never use nautilus (especially for running scripts), so i cant guarantee it will work, although i dont see why it shouldnt... -
Stoping VI inbetween when program seeking data from serial port.
I have an application in which I need to read data from two serial port one after other.
One read will read 14 byte and other 08 bytes(Just info).
Now in between if user need to stop the VI then how to stop it?
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--RanjeetA state machine could do this easily. Just have a state to check for the stop (or any other events).
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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