ConnectionNotFoundException when connecting via serial port

Hi all
I have got a HttpConnection that looks like this
HttpConnection connection = (HttpConnection)Connector.open( "http://localhost:80/test/read.txt" );
InputStream inputstream = connection.openInputStream();
...The above codes work fine on the emulator, but when I wish to connect to the server via the device from the usb cable, it throws me an javax.microedition.io.ConnectionNotFoundException
I'm working on a SE W880i and is running the midlet from the Device Explorer...

Hi,
thanks for the response.
no, I can't login to the switch(es) at all. There seems to be no response from hyperterminal at all. (Then I noticed that the LEDs had gone "solid" and that everyone started to complain they had lost network connection!)
Even when I powered off and powered on the switch with the console port still connected, nothing appeared on the hyperterminal screen.
However, as mentioned, I'm able to connect to one of our spare switches using the same settings, same laptop, and same console cable - so I guess that would rule these things out as being the cause?
Its definitely a strange one, especially as it seems to be affecting all 3 of the live switches!

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Process Name when we connect via Serial Port ,Its URGENT !!!

Hi,
I am working with Sun Solaris 9 sparc and in my application,I have to communicate with the serial port.
For every connection we made, in Solaris it creates a process.So Can anyone tell me the name of the process when we connect serial cable??
like USB connection /dev/usb0 or /dev/hiddev0 process is created..
Thanks in Adavnce ...

Sangyesh wrote:
Hi,
I am working with Sun Solaris 9 sparc and in my application,I have to communicate with the serial port.Outbound to a device, or inbound to a login shell or something else...?
For every connection we made, in Solaris it creates a process.Are you talking about 'telnet' or 'ssh'? Those work differently from serial connections.
So Can anyone tell me the name of the process when we connect serial cable??You might have a login listener if you configure it, otherwise, nothing is running.
You need to provide more details about how you intend to use the serial cable. I can't tell from your post.
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Can no longer connect via serial port

Hi all,
I am an administrator for forty-eight Solaris servers scattered around the world, I have remote console connectivty via Cisco 2821 terminal servers. Recently all the devices were moved to new terminal servers but I can no longer get remote console connectivity to fourteen of them. Most of the servers just give a blank line. I have had the port and cable changed on two of them with no joy. One of the servers was local so I risked a reboot (didn't fancy rebooting one of the distant ones as hands-and-eyes support staff are difficult to get hold of and these are production boxes.). While connected via IP I attempted a reboot, after 20minutes of waiting I decided I'd have to connect directly with my laptop, when I connected the machine was waiting for an ilom login. After logging in and completing the boot the server was working fine and I could connect via the terminal server.
The boxes are Sun 5220's and I am running Solaris 10.
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Cheers,
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Answered my own question:
opened another terminal window and used the command killall ssh to abort the previous session.
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Catalyst switch hangs when connecting via console port

Hi,
I've just started work for a company - they have no network documentation or knowledge of their current set-up whatsoever.
For the LAN in the office they have Cisco Catalyst WS-C3524-XL switches. But it doesn't seem like these are even configured with an IP address for management purposes.
So, I thought I would connect via a console cable to have a look at their configurations and also to investigate some performance problems some users were having on the LAN.
BUT - when I connected to the console cable, all the switch LEDs stopped flickering happily and went solid and everyone in the office lost their network connectivity! (I wasn't popular!)
Rebooting the switch with the console port still connected had no effect - the LEDs remained solid and there was no network connectivity. However, when I removed my console cable, everything started working again!
Does anyone have any ideas a) what can have caused this and b) how I can resolve this problem and connect to the switches without disrupting all the other users!
Note: I subsequently connected to a spare WS-C3524-XL switch using the same laptop and same console cable without any problems.

Hi,
thanks for the response.
no, I can't login to the switch(es) at all. There seems to be no response from hyperterminal at all. (Then I noticed that the LEDs had gone "solid" and that everyone started to complain they had lost network connection!)
Even when I powered off and powered on the switch with the console port still connected, nothing appeared on the hyperterminal screen.
However, as mentioned, I'm able to connect to one of our spare switches using the same settings, same laptop, and same console cable - so I guess that would rule these things out as being the cause?
Its definitely a strange one, especially as it seems to be affecting all 3 of the live switches!

Eurotherm 2704 connection via serial port with ModBus

Hello guys,
first some words about my problem:
I have to develop a software which allows reading and writing the
temperature (we have 3 Eurotherm 2704) (I think some of you know this problem yet ).
I wrote already the program and it works, but I used "iTools OPC
Server" for my program and it was the demo version (works only 30 minutes).
The group doesn't want to pay for the iTools, I should solve this problem without
iTools .
In this forum I found out, that I can use the ModBus for it:
http://forums.ni.com/ni/board/message?board.id=170&thread.id=468139&view=by_date_ascending&page=2
I know, there are some similar threads here, but I am new with LabView
and need some help.
I downloaded one example “my modbus serial query.vi “
http://forums.ni.com/ni/board/message?board.id=170&thread.id=135288&view=by_date_ascending&page=2
but it does not work (I am not really sure, what I have to change in the
file)
With OPC Server I found out:
COM5
Baud Rate 9600
Parity: None
Flow Control: None
Data Bits: 8(RTU) (I can choose RTU, but where can I change to 8 bit ?! )
And by other properties, I have no idea what I have to change there
For Example
Modbus Data Unit In (all read and write mode ? Which one do I need to read the temperature and to set the set temperature?)
Modbus Command ?!!!
No idea.
I have folowing adresses (comms address 0x00030001, canonical address: 1)
Which one do I need ?!
I think if I get the signal from one temperature controller, I can do it for
other, but my problem is now THIS one.
Can you help me whit it ?
Should I use a other example ?! Maybe do you know better one?
Thank you, very much.
Alexander

Hello Putnam and Christian,
I think the problem because you can not understand my question is my English, sorry
I'll try it again:
@Christian:
Thank you for the links, but I think all threads in NI Forum with topic "Help, Eurotherm 2704 ?" were written by me
You understood my problem correctly.
We have 3 temperature controllers and I have to develop a LabView program, which allows reading the temperature from the controllers. It should be possible to write the set temperature from LabView to temperature controller as well.
The controllers are connected already (I think with RS485) and I can read/set the data from/to controllers (with “iTools OPC Server”), but I have to change my program so, that it works without “OPC Server”
@Putnam:
In the meantime I found out, why I got an error with “my modbus serial query.vi” (the solution was very simple, I had to close the OPC-Server ).
It runs now and I try to understand now how the VI exactly works.
Maybe you can help me with it?
I try to explain what I understood, if something is wrong, tell my please:
The “my modbus serial query.vi” allows to read the multiple values (maximum 125 register) (default block read size is 125) from controller (I can see the data in the register array). In each register I have values for different variables. The Modbus address of Loop1 PV (I need this value) is known ( 00001, Eurotherm manual).
Does it mean that the first element in the register-array is the value for the temperature from Loop 1 ?! (multiplicated by a factor, if it is correct, how can I find out this factor? It is linear?)
And if I need the value of Loop2 (the address is 01025), I have to set the start address for example to 1000 and in this case the 25-th element in register-array is the value for PV Loop 2 ?!
I got this idea, after I left the laboratory and could not try it out. I can do it first at Monday, but I would know if it is correct what I think.
If it is correct, I think I will able to change “my modbus serial query.vi” on my own, that it works in my program.
Or there is a better example/solution than “my modbus serial query.vi” ?!
The other problem would be writing of temperature, but I will ask about it later . First temperature READING problem!!
Thank you!
Alexander.
Message Edited by alexphysiker on 01-29-2010 05:30 PM

Connection to serial port via USB adapter- error -2147221503

I am trying to drive a stepper motor provided with possible Labview or VB programs. This motor is supposed to be connected via serial port, but the computer has not some, so I bought an USB adpater to connect my motor via USB. I am using the labview programs provided (Labview 8.0). The program cannot connect to the port and returns error -2147221503. Where may I find some help with that ?
Thanks
Attachments:
error labview.JPG ‏234 KB

I see references to 'Luminos'. Is this the provider of the stepper motor and LabVIEW code? If so, your first step should be to contact them. The whole VI is nothing but ActiveX properties and methods and the vendor would be the only one who knows what is going on.

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Welcome to the forum. Please refrain from posting in old threads that are long dead. When you have a question, please start a topic of your own. Feel free to provide a link to an old thread if relevant.
I also suggest you go through these links before posting again:
[How to ask questions the smart way|http://catb.org/~esr/faqs/smart-questions.html]
[How To Get Good Answers To Your Questions|http://www.tek-tips.com/viewthread.cfm?qid=473997]
I'm locking this thread now.
db

How to transfer file from PC to PC via serial port using labview

I need to transfer files(.txt, .doc, .xls) from PC to PC via serial port using LabVIEW. Is it possible to transfer files, if so how to transfer?
Solved!
Go to Solution.

Yes, it is possible to transfer files with the serial port using LabVIEW. Files are just collections of bytes and the serial port is pretty good at shipping bytes from one PC to another. You need to connect the serial ports together with a null modem cable.
First, take a look at the example for serial communication. In LabVIEW, go to the Help menu and select "Find Examples...". From there you can search for "serial" or navigate to Hardware Input and Output >> Serial. Select the "Basic Serial Write and Read.vi". Experiment with that example to gain confidence on the serial communication methods.
Next, it's time to learn about how to read and write files. For that, the examples could be somewhat confusing since they all deal with files that are presumed to have data of a specific type in them. I would recommend just getting familiar with the functions on the File I/O palette. Specifically, get to know the following functions.
Open/Create/Replace File - On your destination side, you'll need to create the copy of the file that you are trying to transfer
Close File - When you are finished reading from or writing to a file, you should close it. It cleans up the memory being used and finalizes any write operations that are still floating in the write buffer.
Read From Binary File - The best way to read from a file when you do not really care what type of file it is. In your case, you just want to get those bytes read and sent out so they can be written down at the destination.
Write to Binary File - At the destination side, this is what will store those bytes to the file you created with number 1.
Get File Size (under the Advanced File Functions sub-palette) - You need to know how big the file is so you know when you are finished.
OK, so once you are able to create files, write bytes to them, and read bytes from existing files you can move on to transferring.
The basic method I would suggest is to have the user specify a source file on the source PC and a destination folder on the destination PC. Then, find out the size of the source file using number 5. Divide that size number by the number of bytes you feel like transferring at once. The serial buffers are usually around 32k (if I remember correctly) so do not exceed that. Now begin sending data by reading some number of bytes and wiring that string output to the VISA Write function. On the destination side, you'll want to be monitoring the serial port for bytes and reading them when they arrive. Wire that string to the Write to Binary File function to add them to your destination file.
That is the basic outline of how to do it. You have to be careful not to overload the write and read buffers on the serial ports. Initially you can use delays on the sending side to make sure the reading side has enough time to digest. To get things moving faster, you can bring in some flow control.
If all that sounds a bit intimidating, there are Alliance Member companies out there (such as PrimeTest Automation) who can write such code for you and even provide a turnkey solution for you.
Happy wiring,
Dan Press
Certified LabVIEW Architect
PrimeTest Automation

T420 - external 24" monitor DVI- Displayport : not detected when connected via KVM switch

Hi,
I've been using a 2port USB KVM Switch from InLine for a long time connecting a mac mini and a macbook pro
to a 24" LCD. Recently I had to replace the MacBookPro with a T420. Unfortunately the T420 does not detect the
monitor, when connected via the KVM switch.
I tried:
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Using config (A) I then installed the Intel HD Graphics Driver version 8.15.10.2342 16 May 2011
SURPRISE: during driver install, the monitor WAS detected!!!
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hey mgold,
as the T420 works correctly with the external monitor and with the miniDock ; it is sad to say the the KVM switch is non-compatible.
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How can i browse FP 2000 via serial port same use Ethernet port(RJ 45)?

I am a new user for labview.I develope my program with FP 2000 but I have some problem
1 How can i browse FP 2000 via serial port same use Ethernet port(RJ 45)? if it can Tell me please.
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Someone please help me.Thank you very much.

Hi!
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    Have a nice (programming) day!
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Apple TV (1G) doesn't appear in devices list when connected via ethernet

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I would like to use RMI via serial port.
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Thanks for the reply
I can get it sending bytes of info from one machine to
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Hi,
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First of all I would suggest you to configure RD gateway role on your server and pass all the connection through it because it’s a best practice to use RD Gateway in RDS Farm.
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this link.
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ConnectionNotFoundException when connecting via serial port

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