Xlet and serial port

does anybody know if it is possible to make an active Xlet interact with an Input Stream through the serial port?
Roughly speaking i would use the serial connection between the STB and a PC as a sort of return channel

like Steve, Threre is no standard inputstream of serial port in DTV environment. That bounds hardware device.
Most of case of using serial port, STB use to view log in PC. So, if STB manufactors support serial com port in low-level by c function, you shoul check it out on STB manufactors low-level API.
Definitely, MHP does not support inputstream from serial port.

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AC_Radar_Receive.vi ‏46 KB
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http://java.sun.com/products/javacomm/index.html
Follow the install instructions VERY carefully .

Java applets in a browser, and Serial port input

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You should also consider that applets are not allowed to access their client system's hardware without being signed; in other words, the user must agree (by clicking a button) to disable the applet security features. Why would you use an applet to do this? Applets are meant to be an extension of a website. You should use an application in this situation.

Java and serial port communication

Hello,
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RXTX seems to be a decent library for serial/parallel communication using Java.
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Windows and serial port adapters

Hi Everyone,
I am looking to buy a new notebook and am having trouble getting any answers about running Windows on a Mac. I do the bulk of my work programming PLCs, microprocessors, touchscreens, etc... Most of the interfacing is done over RS-232, USB, and Ethernet. All of my programming software is Windows based. I would have to use a ExpressCard/34 slot serial adapter for the RS-232.
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Hi Layne,
I have had great success using Windows and a Belkin USB to RS232 adapter to program Clear-Com RS601 beltpacks and XTA loudspeaker processors.
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Chris

Singleton class and serial port dialog

Hello,
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Thomas

Hi!
>
> You might have got a problem with the visa class type. So you should try
> to find out which is the present type of the visa class. Right clilck on
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> which is marked is your current type - and it might not be the one you
> want to have.
Yes, the problem is apparenty the visa type. The problem is, i tried all of
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never even then wires itself correctly to the VI.
> But there could be other reasons for your problems to link the VIs
> together. For example it is impossile to chain a VISA open with a VISA
> easy write. In this case you have t
o use the standard VISA read and VISA
> write.
I tried all of the VI's by now, but none of 'em work.
> If your problams have another background you should post your VI example
> to the newsgroup. This way it is much easier to find a bug than just
> speculating about it.
It's really just the basic VI's linked together to read from the COM1-port
(visa open, visa read, visa close), because it's meant to be a sub-VI for my
program.
And it can't be a problem of compatiblety (sp?), because i try to create it
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The problem didn't seem to exist on my former computer (win95).
Thanx,
Martin Klein

USB and serial port access in java

Hi
I have a magstripe card reader connected to my computer with a USB interface (port).
I am using javax.comm API to get the card swipe data but could not succeeded.
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ok. Below is my code:
this is a sample code come with the API.
package msr;
* @author Dell
import java.io.*;
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* @author
* @version 1.8, 08/03/00
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     try {
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                            SerialPort.STOPBITS_1,
                            SerialPort.PARITY_NONE);
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     readThread = new Thread(this);
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Send DAQ measurement results through serial ports

Hi, All
I use PCI-6034E for measurement. After DAQ gets data, I send them to another computer through serial port (com1). I write a Virtual C++ program, which calls NI-DAQ library functions to implement DAQ data sampling (multiple channel scan) and sends measurement data to another computer through serial port under request. DAQ data sampling and serial communication are implemented in two threads. They are running concurrently. They share a global memory for measurement data. The serial communication thread will do infinite wait and send data only when another computer sends a request through serial port.
I met two problems. First, when I reduce the size of DAQ measurement buffers (piBuffer and halfpiBuffer, I us
edouble buffer model), DAQ measurement is often interrupted by the message "[DAQ_DB_HalfReady] returned NI-DAQ warning 10846. Your application was unable to retrive data from the background acquisition buffer fast enough so the unretrieved data was overwritten with new data. ...". I want to get run time data so I need to reduce the buffers as small as possible. How can I solve it ? The second problem is that the serial port gets error data (nothing) from measurement computer sometimes, especially when DAQ initializes itself and finishes work. It looks like that there is a conflict between DAQ and serial port. Does anyone have similar experience about this? Any suggestion?
Thank you in advance.
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Le Cai,
You are correct that the number of scans to read is equal to half of the buffer in double buffer mode. I was mistaken and referring to a standard (non double buffered) operation. However, you can increase the size of your buffer without affecting the period of your acquisition. A buffer of 60 is quite small and, as such, will be more prone to overflow errors. The rate is actually set through the DAQ_Rate() and DAQ_Start() functions. For more information on these functions and how to configure the scan rate, please see the NI-DAQ Function Reference Manual.
NI-DAQ Function Reference Manual for PC Compatibles
http://digital.ni.com/manuals.nsf/websearch/1630A0B68738B269862567C1007A2912?OpenDocument&node=132100_US
A good place to start would be the example titled, "DAQdoubleBuf.c" which ships with the NI-DAQ driver. If you installed the examples for Visual C++ when you installed the NI-DAQ driver you should be able to find this example in the \Program Files\National Instruments\NI-DAQ\Examples\VisualC\AI folder on your computer. This example would be a good template as it is very close to what you are trying to do.
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Regards,
Justin Britten
Applications Engineer
National Instruments

Reading Serial Port?

Sorry, I'm not sure if this thread is the same thing but is Java capable of reading in 15 pins RS-232 port data stream? If so, could some one please point me to a good place to start, such which classes shall I use? thanks

Peter__Lawrey wrote:
You are right serialization and serial ports have little to do with one another.
You could start by looking at [http://java.sun.com/products/javacomm/]
I couldn't find an obvious forum for serial ports either [http://www.google.co.uk/search?q=java+serial+api+forum]
Thanks, Pete. Thanks, George. It seems like Sun is no longer supplying Javax comm development kits from that link. I take that all newer version of JDK are shipped with it?

How to add control buttons using Java thorugh serial port?

Hi everyone,
I'm new to this forum.
I have some questions on Java and serial port.
I want to write a Java program to control my robot, through serial port. For example, when I click "Forward", the robot will go forward, and so on.
Now I already have the buttons, so next I would like to ask how to interface the buttons with the serial port.
I already have all the javax.comm things installed.
below is the code for my buttons:
import java.awt.*;
public class ControlButtons extends java.applet.Applet
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Thanks

The plan is, I have a robot device connected to the serial port.We don't know anything about that device. We don't know how to control it. We don't know what you have to write to the device to make it do anything. Only you know what.
For example, when I click "Forward", the robot will go forward, and so on.So what do you have to send to make it do that? and same for the other buttons.
Next, you need to work out from the javax.comm API how to open the serial port and send data to it. This is a standard exercise in learning a new API. You must be able to do this. Again and again.
But the program is useless. The button can be clicked, but didn't do anything.Because (a) they have no ActionListeners and (b) there is no code to send anything to the serial port.
You have to write all that. So you also have to look up ActionListener in the Java API and how to attach it to a button. You can do that. We all do that kind of thing every day.
So next I would like to ask how to interface the buttons with the serial port.You've been asking nothing else since you started, but you've also only done enough investigation of your own to create the buttons. That's only the start.
The problem is what method and command should I use to make those buttons actually functioning.See above. You've been told part of it several times. The rest only you can answer, because it's your robot.

COMMAPI freeing serial port

I have a question about Java commapi and serial ports. In my application I call close on a SerialPort object and associated input/outputstreams. Later on I try to open the port again by calling open on a CommPortIdentifier object and I get a RuntimeException with message "Device busy". If I close the application and start it again, the serial port is opened without problems. My question is should I do something more when closing the port to free it?
Code that tries to close the port:
inStream.close(); //inputstream
outStream.close(); //outputstream
inStream=null;
outStream=null;
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port.removeEventListener();
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I know this is a very old post, but google came up with it after searching for ttyUSB0 and java, so I thought I'd chip in the solution so that other people arriving here might benefit :)
The trick is to go into javax.comm.properties and add the ttyUSB0 to the list of serial ports:
# Implementation specific driver
driver=com.sun.comm.LinuxDriver
# Paths to server-side serial port devices
serpath0 = /dev/ttyS0
serpath1 = /dev/ttyS1
serpath2 = /dev/ttyUSB0 # <--- added ttyUSB0
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"Example on reading combined signals from a serial port and separating them for display purposes". I am a beginner in Labview and would appreciate if anyone help with that

I am working on a wireless vital sign monitor. I have 3 signals; heart rate and temperature. I filter and amplify the signals before converting them into digital form. I then pass them via MAX232 before passing them to RS232 serial cable.
I am therefore working on a program to receive the combined signal and separate them.
I have come across serial read and write examples on ni.com but am looking for one where I can actually separate combined signals and display them separately.

Reading the serial port will give you a string. How you divide the channels depends on how the data was formatted before it was sent over the serial channel.
If you are designing the instrument, as it seems from your query, then you can set up any form you wish. If your data is always floating point numeric, you could use space or tab characters to separate data words. You could use and XML format. If the instrument is provided by a vendor, contact them for the protocol.
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Lynn

Xlet and serial port

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