Error 56 in Telnet Read

Hi!
Does anybody know why I get error 56 with Telnet Read function even
connection is workin fine and I can receive messages trough Telnet? I
have tryed to use Line read and normal mode. With normal mode i have
use bytes to read values, which are same as send data or even smaller
than sended data, but always I get error 56. After error 56 apperars,
sended message from Telnet Read buffer is read to my VI and everything
works correctly. Problem in this is that I would like to error handler
to tell user when connection realy doesn't work, but now error 56 comes
even everything works fine.
Thanks for all help I can get.

Using Labview 8.5, XP, Telnet Line Client, I get the following error 56, TCP Read in Telnet Buffered Read.vi->Telnet Read.vi:3->Telnet Line Client.vi.
I looked up this error which looks to be a Networking error: 56 The network operation exceeded the user-specified or system time limit.
The data does seem to return properly but this has been an ongoing issue with previous Telnet clients we are using.

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Endless Telnet Read Loop

Hi
My goal is to constantly archive data to a local machine thru a Telnet connection. I receive a small amount of streaming data (25 bytes/second) thru a static IP address. The code that is attached is my attempt to
1) initiate a Telnet connection to a static IP address
2) read the streaming data, write to binary file on local machine
3) send some pertinent info to the screen for the user
since I always want to have the VI reconnect if the Telnet connection is dropped (or times out), I attempt an "endless" loop that will
4) close the Telnet connection
5) reopen the Telnet connection
6) recommence writing data to binary file on local machine
My questions are:
Q1) Did I write this correctly? Behavior is erratic. Sometimes works perfectly, sometimes doesn't work. I am unclear if I need to use a sequence of events within the outer loop to properly reconnect whenever a telnet connection is lost (sequence1: open Telnet, 2: write data. 3: close session, loop back to 1).
Q2) Often, when there appears to be no successful Telnet connection (by this, I mean no data streams to the screen which indicates the data feed will not be written to a binary file on the local machine), the numbers in the "File Size (bytes)" continue to increase. When I open the binary file to see what is being written I find the same character repeated instead of the data I wish to collect. I think perhaps that the Telnet Read is reading something, but I don't know what it is, or how to control it. Any ideas?
Thanks!
Attachments:
MBB06RawTelemetry.vi ‏27 KB

I said stop the inner loop either when the
button is pressed (as you still have) OR there is an error. So look at
the status of the error wire and OR it with the stop button before
wiring into the inner loops stop terminal.
Ok. Clear now.
I'm not sure
why you'd be getting a stop/continue dialog for error 56 because I
can't see anywhere in the code that would cause the dialog to pop up.
Drop some more indicators on your error wires, or probes. Run with
highlight execution turned on. Do any or all of these things until you
can figure out where the error is occurring.
Ok. I can do this. More later if necessary.
I don't know
where ^@ would be getting generated from unless somehow the telnet
protocol is doing it. What you could do is put a case structue or
select statement in the middle of the string so that if there is no
error, the string value goes from the read to the file. If there is an
error, an empty string goes to the file.
What do you mean by "in the middle"?
Q3: Is it possible that having multiple Telnet sessions open at one time would create issues like this? The final goal is to archive the telemetered data from 6 stations at once through the telnet port of one machine.
Go Beavers.

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I am trying to use telnet to send TL1 command to my UUT and expect to read back measurement data. I was able to read proper data once in a while but most of the time I read back the TL1 command that I sent. I tried different read mode and timeout period but nothing seem to matter. My vi was written in Labview 8.2.1 with Internet toolkit. I read in the forum about some limitation of the telnet read problem of the vi from the internet toolkit, Is there any better read driver around?
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Hey! I have a few questions for you that should help us solve this problem. First, have you tried out the telnet shipping example "Telnet Line Client.vi". This will help us minimize programming errors, etc. Also, what type of device are you trying to communicate with? Are there other forms of communication available? For example, does the device also have a serial port, GPIB Port, etc.? Also, is it possible to write to the device using TCP/IP (This is what telnet is based on)? Let me know the answers to these questions and I will be better equipped to help you out!!
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Telnet read problem

While doing telnet read, if the operation times out, I don't get an error.
I am using telnet read in line mode. My line separator is my prompt char
"cli>". Timeout is set to 10seconds. If I turn of power to my device after I
logged in successfully, my telnet read operation should fail, but telnet
read return OK.
vishi

I just checked the version of the Internet Toolkit that I have just to check, and that is apparently the intended behaviour. For some reason, NI tends to not see timeouts as an error.
The thing to do is open up the read icon and follow the error clusters through. In the version I have, there are several places where there is a small icon labled "NO TO" on the error cluster that (you guessed it) filters out any timeout errors that occur.
The simple fix is to rename the read VI and then go through it and remove all the timeout filters--which really shouldn't be there in the first place.
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"... after all, He's not a tame lion..."
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Two Telnet read VI's running at the same time interfere with each other

I have a situation where multiple tests must test multiple UUT’s on the same computer. To send commands to and get responses from the UUT's I use a telnet session. The telnet read VI uses a semaphore. Therefore when two separate top level VI's are running, each calling the Telnet read VI, if one Top Level VI is using the Telnet Read VI the other Top Level VI waits for the first one to complete before it can use the Telnet Read VI. This VI is setup for reentrant execution but because of the semaphore it cannot truly be used as a reentrant function. This causes severe problems when trying to communicate with two different telnet sessions simultaneously.
In the past I have avoided this problem by compiling everything into an executable. Then each Top Level program runs completely independently with no interdependences. However, now I am implementing Teststand and I need to call the same Top Level VI's. I need to be able to get information into them and back out of them from Teststand. This means that I can no longer compile them into stand alone executables. I did compile each top level VI into its own Share DLL thinking that then each top level program would have its own library to call upon. This did not work. Even though both top level programs are compiled into their own DLL there is still interdependency when calling the telnet read VI. One program waits for the other to finish reading from its telnet connection before it can read from its own telnet connection. Since I have to continuously read from the telnet connection, sometimes for up to half and hour, the tests do not function simultaneously. How can I get around this? Is there a solution?
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PS The Telnet Read VI I am refering to came with the Internet Toolset package. Attached is a copy of the VI I use to communicat with the UUT's.
Attachments:
GUI_Telnet_W-R_Auto.vi ‏64 KB

Sorry about the confusion.
The file I attached is in the hierarchy of two separate top-level VI's. The telnet connect is opened once and closed once in each top-level program. The ref number is then passed into and out of the VI that I attached. I use this VI to repeatedly send commands via telnet and wait for the appropriate responses. The telnet read VI is given a read line separator and reads from the telnet connection until it matches the read line separator with a text string read back from the telnet connection. If not match is found it times out and creates an error.
I am not sure how to provide an example of the overall scheme since the problem occurs when both top level VI's are compiled each into their own shared DLLs. Those DLLs are then call from Teststand and at some points they are both running at the same time on the same computer connected to two different UUT's.
The question I have is why does one DLL share functions with the other? When one DLL is using the telnet read VI the other DLL waits for the first one to finish with it before it can it use the telnet read VI. If they were both compiled separately each into their own DLL shouldn't they each have their own set of functions to call upon instead of having to share? I know that if the two top-level VI's are not compiled they cannot both execute the same sub-VI at the same time. The only way to get around this is to set the execution property on the sub-VI to reentrant.
I actually fixed the problem by setting the VI I attached and the Telnet Buffered Read.VI (called by Telnet Read.vi) execution properties to reentrant. However, I am still concerned about two separate DLLs sharing sub-VIs. Why does it do this?
Joshua

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Error 56 in Telnet Read

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