RE: PL2303 Driver Issue

RE: PL2303 Driver Issue

[Reddy Kaveri, Praveen Kumar]

Hi,

I am using Telxon PTC-710 device in linux environment and I am using RS232 Serial to USB converter. When I connect the device to USB port it is detecting and showing in the system log as "attached to ttyUSB0".  I have written a java program to display all the available ports. But this program is displaying only ttyS0 &ttyS1. I have tried to set all permissions to the user as well as to port. Please help me if I am missing any configuration related to this driver.

I look forward to hearing from you.
Thanks In advance

Regards,
Praveen Kumar Reddy K
Hewlett-Packard Company

#101, 1035 64 Ave SE ,Calgary, AB, T2H 2J7, CANADA

+1 403 692 7914 / Tel 
+1 403 619 8242 / Mobile 
praveen-kumar.reddy-kaveri@hp.com / Email

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Re: PL2303 Driver Issue

[Greg KH]

On Sat, Oct 06, 2012 at 06:33:19PM +0000, Reddy Kaveri, Praveen Kumar wrote:
> Hi,
> 
> I am using Telxon PTC-710 device in linux environment and I am using
> RS232 Serial to USB converter. When I connect the device to USB port
> it is detecting and showing in the system log as "attached to
> ttyUSB0".  I have written a java program to display all the available
> ports. But this program is displaying only ttyS0 &ttyS1. I have tried
> to set all permissions to the user as well as to port. Please help me
> if I am missing any configuration related to this driver.

You are going to have to modify your userspace program to know to look
for the ttyUSBX devices as well.  There's nothing the kernel can do
about this.

As you wrote the program, how are you getting the list of serial devices
in the system?

greg k-h
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RE: PL2303 Driver Issue

[Reddy Kaveri, Praveen Kumar]

[-- Attachment #1: Type: text/plain, Size: 2177 bytes --]

Hi Greg,

Thanks for your assistance.

I am using RXTXComm API for getting list of serial ports and available USB ports. I have attached the java code for your kind glance.
For some of the point of sales machines the telxon device is working. 

If the connection is successful, the following information is displaying.

Bus 001 Device 003: ID 0557:2008 ATEN International Co. Ltd.
                Language IDs: none (invalid length string descriptor 63; len=7)

If the connection is failed, the following information is displaying.

Bus 001 Device 002: ID 0557:2008 ATEN International Co. Ltd.
string descriptor 1 invalid (00 00; len=52)
string descriptor 2 invalid (00 00; len=48)

I am less proficient in linux. So kindly help me in resolving this issue.

What does it mean "string descriptor 1 invalid"?
Is it causing the problem. If so please let know how to resolve this.


Thanks & Regards,
Praveen Kumar Reddy K
Hewlett-Packard Company

#101, 1035 64 Ave SE ,Calgary, AB, T2H 2J7, CANADA

+1 403 692 7914 / Tel 
+1 403 619 8242 / Mobile 
praveen-kumar.reddy-kaveri@hp.com / Email




-----Original Message-----
From: Greg KH [mailto:greg@kroah.com] 
Sent: Sunday, October 07, 2012 8:47 AM
To: Reddy Kaveri, Praveen Kumar
Cc: linux-serial@vger.kernel.org
Subject: Re: PL2303 Driver Issue

On Sat, Oct 06, 2012 at 06:33:19PM +0000, Reddy Kaveri, Praveen Kumar wrote:
> Hi,
> 
> I am using Telxon PTC-710 device in linux environment and I am using
> RS232 Serial to USB converter. When I connect the device to USB port
> it is detecting and showing in the system log as "attached to
> ttyUSB0".  I have written a java program to display all the available
> ports. But this program is displaying only ttyS0 &ttyS1. I have tried
> to set all permissions to the user as well as to port. Please help me
> if I am missing any configuration related to this driver.

You are going to have to modify your userspace program to know to look
for the ttyUSBX devices as well.  There's nothing the kernel can do
about this.

As you wrote the program, how are you getting the list of serial devices
in the system?

greg k-h

[-- Attachment #2: SerialProgramming.java --]
[-- Type: application/octet-stream, Size: 1838 bytes --]

package com.marks.builder;

import gnu.io.CommPortIdentifier;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.UnsupportedCommOperationException;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;

public class SerialProgramming {
    static Enumeration portList;
    static CommPortIdentifier portId;
    static String messageString = "Hello, world!\n";
    static SerialPort serialPort;
    static OutputStream outputStream;

    public static void main(String[] args) {
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            System.out.println(portId.getName());
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                 if (portId.getName().equals("COM3")) {
                //if (portId.getName().equals("/dev/term/a")) {
                    try {
                        serialPort = (SerialPort)
                            portId.open("SimpleWriteApp", 2000);
                    } catch (PortInUseException e) {}
                    try {
                        outputStream = serialPort.getOutputStream();
                    } catch (IOException e) {}
                    try {
                        serialPort.setSerialPortParams(9600,
                            SerialPort.DATABITS_8,
                            SerialPort.STOPBITS_1,
                            SerialPort.PARITY_NONE);
                    } catch (UnsupportedCommOperationException e) {}
                    try {
                        outputStream.write(messageString.getBytes());
                    } catch (IOException e) {}
                }
            }
        }
    }
}

Re: PL2303 Driver Issue

[Alan Cox]

On Fri, 12 Oct 2012 22:15:08 +0000
"Reddy Kaveri, Praveen Kumar" <praveen-kumar.reddy-kaveri@hp.com> wrote:

> Hi Greg,
> 
> Thanks for your assistance.
> 
> I am using RXTXComm API for getting list of serial ports and available USB ports. I have attached the java code for your kind glance.
> For some of the point of sales machines the telxon device is working. 

Make sure your Java implementation rxtxcomm isn't too stupid to look for
USB ports. There were endless problems with some old versions of rxtx with
JMRI and USB serial ports.

Also as the same user try  stty -a </dev/ttyUSB0. That will if it's
behaving sensibly dump the terminal state (speed etc) on your screen.

If that works you've almost certainly got a problem with your java.