Read bit in the TCP connection

Similar Questions

• Good method to reset the tcp connection after timeout error

  I have an application that I build that communicates with a Modbus TCP device.  If a communication occurs error I wish I could reset it TCP communication.  What I have is a control that raises an event when pushed.  In this case, I have a sequence that closes first the tcp connection and then opens a new connection.  My application starts and works very well.  To test the reset function, I removed the ethernet cable from the camera and waited until a timeout occurs.  I plugged the cable reset back to and pushed my control. Sometimes the reset will take place, but most of the time I'll get a timeout in the TCP vi open error.  After that, the only way I can establish communications must leave my application, disable and then enable the network device.  Then, when I restart my application I have communication with my camera.

  Any help would be appreciated on how I should be reset my TCP connection.

  Thank you

  Terry

  Terry S of a. in writing:

  I've attached an example vi (LV10) that shows just the connection TCP and Reset.  An error occurs when you try to run the open in the event of reset tcp protocol.

  As writing that your code should be fine. There is nothing inherently wrong with it. However, depending on the device, you communicate with you can try to restore the connection too quickly once you have closed the connection. The device allows multiple connections to it and may require some time to clean up the things on his end after you close a connection. An experimental basis try wait little time between TCP and the TCP Open shut it down. If possible you can try using Wireshark to see what is happening on the network. It may be useful to diagnose what is happening.

• Problem of test Signal before using the TCP connection

  Right now my application uses a SocketConnection TCP to communicate with a remote server.  It works fine, but I'm trying to make sure that my program can correctly handle the situation to move to an area with no coverage.

  When I run my application, if I uncheck the box "on the cover" for GSM and CDMA under Network properties, my app fine until it calls the OutputStreamWriter.write () function to send something on the socket connection.  I have it in a try/catch block, but it just seems to hang instead of throwing an exception.

  How can I check the signal before attempting to send data on the SocketConnection?

  To facilitate clear life upwards, here's the order of what happens:

  1 application starts on the cover.

  2 SocketConnection made successfully.

  3 OutputStreamWriter successfully SocketConnection.

  4. coverage is lost

  5 OutputStreamWriter.write () is called, but freezes instead of throwing an exception.

  The socket connection output stream write operations do not throw an exception when there is no coverage is the correct behavior. That's because on cellular networks the IP tunnel to the carrier (and therefore the TCP connections on this tunnel) survives loss of coverage. For example, if your application opens a connection TCP from a BlackBerry, then the BlackBerry loses coverage, then take cover, say, 1 minute later, the TCP connection opened by your application will continue works fine, unless intermediate network component or your server closes the connection due to inactivity.

• How to record images of 8 bits of a TCP connection with a smart camera

  Hello my name is Cris and I try to record images 8-bit generated from a Smart Camera NI 1742, which has a frame rate up to 60 images per second. I want pictures of flow time I need and save each image. I've currently implemented the next VI I found in this article: Images streaming of a Vision Compact to a local AVI system , one of my goals was the next, can save an AVI file and now I can do it. According to this article on the screws flattens the images for data of type string, and sends the data to the local computer (PC) through TCP/IP communication (because data can be stored inside the smart camera).  Then, the Local.vi (shown in the figure), on the computer local Windows, receives the string data, it unflattens back to images and records the images in an AVI file. So my question is how can I proceed to receives the string data and save it directly to files with names like 0001.jpg 0002.jpg, etc., automatically instead of using framework for writing to AVI?. I think to use the IMAQ write string that returns a string that contains the entire contents of the image encoded as an image file and the string can be saved to the file (without unflatten it). How can I change the Local.vi?

  Any help, comments help a lot. Thank you.

  
  

• Vista 32 bit loses the internet connection after about 10-15 minutes.

  I lose my internet connection after 10-15 minutes.

  The message says local access only.

  The only way to reconnect is to restart the computer.

  I use a devolo home plug network system. It is connected to a 210 of BT router travel.

  I also have a new computer recently bought and installed Windows 7. There is no problem with that.

  Maybe it's a coincidence, but the problem started only since the installation of the new model.

  
  

  Hello Cody C.

  Thanks for your reply. I tried this. It is said that the drivers are up to date.

  I go into the settings of power network and checked the box "turn off network card to save energy.

  Since that seems to be OK. Only time will tell if.

  Thanks a lot for all the replies. EXTED

• Refuse the TCP (no relation) dan disassembly TCP connection ON ASA 5510, HELP Please

  IM currently implemented with AIP-SSM-10 ASA 5510 IPS and I have problem with ASA, with IPS feature currently disabled, I keep received complain blocked/idle the connection to the oracle server, using port 8000 host remote-office, I traced with syslog and message received from large number associated with the oracle server IP address.

  the network diagram is a bit like this:

  ________ ________ _____________

  | Oracle | switch | ASA 5510 |

  | Server | | ___ |---| transparent |

  -------- -------------

  192.168.10.206 |

  |

  |

  -------------

  | ROUTER |

  |___________|

  |

  ________ -------------

  | DISTANCE | ------ | Router |

  | THE USER | -------------

  ----------

  192.168.5.x

  and the syslog message looks like:

  302013: built inbound connection TCP 1662347 for OUTSIDE:192.168.5.52/1311 (192.168.5.52/1311) inside:192.168.10.206/8000 (192.168.10.206/8000)

  302014: disassembly of the TCP connection 1662345 for OUTSIDE:192.168.5.52/1310 for inside:192.168.10.206/8000 duration 0: 00:00 542 bytes TCP fins

  302013: built inbound connection TCP 1662345 for OUTSIDE:192.168.5.52/1310 (192.168.5.52/1310) inside:192.168.10.206/8000 (192.168.10.206/8000)

  302014: disassembly of the TCP connection 1662343 for OUTSIDE:192.168.5.52/1309 for inside:192.168.10.206/8000 duration 0: 00:00 539 bytes TCP fins

  302013: built inbound connection TCP 1662343 for OUTSIDE:192.168.5.52/1309 (192.168.5.52/1309) inside:192.168.10.206/8000 (192.168.10.206/8000)

  106015: deny TCP 192.168.5.52/1302 to 192.168.10.206/8000 flags ACK END on the OUTSIDE interface (no link)

  302014: disassembly of the TCP connection 1662338 for OUTSIDE:192.168.5.52/1308 for inside:192.168.10.206/8000 duration 0: 00:00 538 bytes TCP fins

  106015: deny TCP 192.168.5.52/1301 to 192.168.10.206/8000 flags ACK END on the OUTSIDE interface (no link)

  106015: deny TCP 192.168.5.52/1298 to 192.168.10.206/8000 flags ACK END on the OUTSIDE interface (no link)

  106015: deny TCP 192.168.5.52/1303 to 192.168.10.206/8000 flags ACK END on the OUTSIDE interface (no link)

  can someone help me, I'm completely stuck on this problem to cause...

  Thank you.

  7.1 (2), which contains the fix for it, is already posted at http://www.cisco.com/cgi-bin/tablebuild.pl/pix.

  If the workaround works for you, however, and you don't touch any other problems, then I would probably recommend you just stay on this version, but I'll leave it up to you.

• How to prevent a TCP connection that is closed when the VI who opened it terminated.

  Hello everyone.

  I'm developing an application based on the servers and clients communicate through TCP in LabVIEW 2012.

  When the Server/client opens a TCP connection, it starts an asynchronosly running "Connection Manager", to which connection reference that takes so all communication happening. It all works very well.

  -J' have a situation where a client connection manager can be informed of another 'new' server. I would like to open the connection (to see if it is still valid) and then pass this reference of connection to the main client code to spawn a new connection manager. This avoids lock me up the Client code main with an ish timeout if the 'new' server does not really accept connections.

  The problem is that if the connection manager that opens the connection to the 'new' server is stopped, then it seems to destroy the reference he opened. This means that the other connection manager that has been happily character with the 'new' server has closed TCP communications (I get an error code 1 on an entry).

  I created an example to illustrate the issue which should be used as follows:

  1 run server.vi - he will listen for a connection on the specified port on his comics.

  2. run Launcher.vi CH - it will open a connection to the server and pass the TCP reference to an instance of connection Handler.vi, which he started.

  3. the connection manager needs to send data to the server

  4. stop the Launcher.vi CH

  5. the will of Handler.vi connection error.

  Any suggestion would be appreciated.

  See you soon

  John

  Do not perform the opening and closing of the TCP connection in Subvi. Do this to master VI.

• Error of TCP connection when sending MODBUS for WAGO controller 750-881 orders after 113655 bytes of data have been sent

  Hi all

  I'm new in the world of labview and trying to build a VI that sends commands to a controller of the WAGO 750-881 at regular intervals of 10 ms.

  To set each of the WAGO comics at the same time, I try so to send the Modbus fc15 command every 10ms using Labview standard TCP write module.

  When I run the VI it works for about a minute before receiving an error message 56 telling me the TCP connection has expired. This strange thought, I decided to record the number of bytes sent via the TCP connection while running the program. In doing so, I noticed that the link broken after exactly 113655 bytes of data have been sent each time.

  Thinking can I have sent too many messages, I increased the delay of the loop of 10ms to 20, 100 and 200 ms, but the error remained. I also tried to play with the TCP connection timeout and the writing TCP timeout, but none of these had no effect on the problem.

  I do not see why this error occurs, such as the program works perfectly up until what brand 113655 bytes.

  I've attached a screenshot of the base VI (simply showing a MODBUS command sent every second) and a more advanced VI (where I am able to control each of the WAGO manually by setting a frequency at which the DO is to switch between ON and OFF).

  If anyone has any ideas on where the problems lie, or that I could do to debug more program this would be greatly appreciated.

  AvdLinden wrote:

  Hi ThiCop,

  Yes, the error occurs after exactly 113655 bytes each time. Time-out control, I would like to use is 10ms, but even that will rise to 1 s or 10s does not error, which leads me to believe that's not the issue (as well, do not add any delay in the while loop, so let it run at the maximum speed showed that the TCP connection is able to send all the bytes 113655 in less than 3 seconds again directed towards control of time-out) is is not the issue here).

  I tried the suggestion of Marco but having difficulty to translate the string returned in a readable string (rightnow the answer given is "-# +" ' ").

  As for your second suggestion, I've implemented something similar, where I created a sub VI to establish a TCP connection, send a message and then close the connection. I have now to build each message and then send the string to the Subvi, which sends the command to my application successfully. While not the most elegant method to solve the problem, it solves the problem of time-out, which means that I am able to send as many orders as I want. So in this sense, the problem has been resolved.

  If you have advice on how to properly read the TCP read the output, I want however to see if I could not get my first program to work because it is slightly more robust in terms of timing.

  MODBUS RTU TCP is a binary protocol, as you show in your base VI, where you put in the form the data stream using byte values. So you have to interpret the returned answer accordingly with the Modbus RTU spec in the hand. Now what is probably happening is that the connection is suspended after a while because you do NOT read data from the device sends as response to your commands. The TCP/IP stack cushions these bytes and at certain point of overflow internal buffers and the connection is blocked by the battery. So to add playback of TCP in strategic locations (usually after each entry) is the right solution for this. Is there a reason any that you do not use the PROVIDED Modbus TCP library?

• The internet connection is lost when the computer puts itself to sleep after that idlen too long time needs to restart to re-establish the connection.

  I lose the internet connection

  Window vista Home premium intel core 2 quad CPU q6600 @ 2.40 ghz, 3.00 GB ram the System 32-bit

  The internet connection is lost when the computer puts itself to sleep after that idlen too long time needs to restart to re-establish the connection

  Hello

  Control Panel - device - network - manager double-click the used network - power management device
  Tab - uncheck the computer to allow him to turn off the device.

  Control Panel - Power Options - check at each change of diet Plan - change Plan settings - advanced
  Power settings - check the settings there.

  You may reset the default power Plans and and then change them as needed.

  How to restore the default power in Vista (and then go back and change as you wish)
  http://www.Vistax64.com/tutorials/198047-power-plan-restore-default-settings.html

  I hope this helps.

  Rob Brown - Microsoft MVP<- profile="" -="" windows="" expert="" -="" consumer="" :="" bicycle=""><- mark="" twain="" said="" it="">

• Modbus/TCP connection to the controller of power Eurotherm EPack

  There are examples of how to connect to a power controller Eurotherm EPack a modbus/TCP connection?

  I downloaded the Modbus LabVIEW ni_lib_modbus_library library - 1.1.3.32.vip and installed using VIPM.

  However, I am not familiar with the Protocol modbus and terminology such as coils, keeping records.

  I can't even properly run examples for Modbus master and slave to this library :-(

  Most important for me now is just to read the value of the artwork process.

  "ITools" Eurotherm controller software provides information about something I think are an address of memory the value of process I want to read.

  However, I have no idea how to set the various parameters to get successfully connect and read the value of the process.

  Trying to solve my problem, I managed to have basic communication and engineering data conversion.

  Now I can read values of process as the power line frequency, voltage and others.

  Once you know, it's very simple (once you have the modbus library)

  Some things that remain unclear:

  -What values are 32-bit and 16-bit?

  -is the method of addressing identical for all parameters?

  -is it the same for reading and writing?

  I would like to be able to write the target value, for example.

  I'll contact the seller for these outstanding issues. The manual is not really clear (at least not for me). He mentions that some values may be treated differenly (they 16bits, but globally, so 5001 with a scale factor of 100 means actually 50.01 for example).

  See the attachment for reading cover base.

• Using the BIS network but with guidance TCP connection string

  I just want to clarify if this is really possible.

  Being a small/medium business, that we can afford to be a partner just blackberry alliance partner to win have BIS-B connection size.

  In any case, I just want to clarify that if a device is registered with BIS, is it still possible for my application to use the direct TCP connection string (with AFN etc) to extract information via web services and socket connections?

  I read this, I just want to be sure before making further development to 100%

  http://supportforums.BlackBerry.com/T5/Java-development/connecting-your-BlackBerry-http-and-socket-...

  most of the time: Yes. It is dependent on the vendor however, some may charge extra, for example.

• I have Win7 64 bit and keep losing the internet connection. Convenience store says no istalled network adapter, the same as the one I use now. Dees wireless router is Belkin WN311B &#62; yet my i pad tracks fine.b

  I have a Dell Studio XPS9100 with dual core to intel 2.8 GHz running Win7 64 bit & Belkin router WN311B wireless + wireless adapter. My complaint is that I continue to lose internet connectivity. I quit the program & run the troubleshooter who told me once the wireless card is not installed. I tried to reset the modem & without any result. Sometims you can disconnect & connect internet and reconnect.  My pad on the same system I have no problem. Please help, what is the problem.

  Hello

  Have you made changes on the computer before this problem?

  This problem may occur because of driver or network connection settings.

  Try the following and see if it helps.

  Method 1:

  Refer to the steps in the following Microsoft article and check if that helps.

  How can I troubleshoot network card?

  Method 2:

  This problem can occur if authentication enable IEEE 802. 1 X for this network checkbox is enabled. If this box is checked, but there is no server to authenticate the connection is interrupted. If you turn on the wireless network connection, it disconnects again after a short period.

  To disable authentication IEEE 802. 1 X, follow these steps:

  a. Click Start, type ncpa.cpl, and then press ENTER.

  b. right click on your wireless network connection, then click Properties.

  c. click the wireless networks tab.

  d. under preferred networks, click your wireless network, and then click Properties.

  e. click on the Authentication tab, click to clear the authentication enable IEEE 802. 1 X for this network check box and then click OK twice.

  Method 3:

  I suggest that you do the following and check if it helps.

  a. click "Start", enter "NCPA. CPL"(without the quotes) and press ENTER.

  b. right-click on the connection you use for the local connection, and then click "Properties".

  c. Click to select 'Protocol Internet Version 4 (TCP/IPv4)' and then click 'properties '.

  d. in the Internet Protocol window, we will change the "Preferred DNS server" to 208.67.222.222

  e. click 'OK' twice to complete the change.

  Hope that the information provided is useful.

• 63 error to TCP connection open in Simple data Client.vi when connecting to the network storage device.

  Hello

  I tried the simple data client and simple example of data server. I tried this example to connect to a NAS device. My laptop properly communicates with the device since I ping the address of the NAS device and discovered it works perfectly fine. Also, I put the static IP of my pc even as the NAS. So everything I've done. But when I run the program giving the ip address of a NAS device, it shows an error 63.

  Error 63 to TCP connection open in Simple data Client.vi

  Possible reasons: LabVIEW: serial port receive buffer overflow. = LabVIEW: the network connection was refused by the server.

  Why is happening. What can be done to solve this problem. Thanking you.

  vindsan wrote:

  What is the firewall of the SIN.

  Yes, it is very likely. Try disabling the firewall and try again. If the code works when you run the Server & client on your machine, but not when you run the server on your NAS and client on your machine (assuming you have entered the correct port for the NAS server), then it is very likely to be a firewall problem.

  vindsan wrote:

  Server that is listening is no longer VI also means what.

  Your VI server listens only once for a connection after receiving an incoming connection (or it expires after 60 years), he stops listening and the port will be more open for incoming connections - you must re - run the VI for another connection. With your code, you must run the VI server and then run the VI client in the 1960s, so it's not expire.

• How to get the IP address of the client when TCP connect on the server

  How to get the IP address of the client when TCP connect on the server.

  The only parameter obtained the login is the login ID.

  I assume you are using "Wait of TCP on the listening port" on the server. This returns the remote address and port (like out in option).

• Why the customer does not receive the 1 d array sent by the server via a TCP connection?

  I have attached 3 screws:

  1 PC.vi (server)

  2 xbee.vi (client)

  3 CreateSetupPacket.vi (it generates a table of numeric values)

  #1 is executed first, followed by #2.

  #2 tent initiates a TCP connection to #1.  As soon as #1 it detects a "login ID" is created.

  #1 tries to send a package of 'setup' to #2 by the construction of a table.

  The problem is the client of xbee VI gets 0 bytes or "" empty string back.  What Miss me?

  Note that I was running the two VI on the same PC.  And it worked because the IP addresses were set to localhost.

  I don't know if a Windows Firewall affect TCP/IP communication in the same PC.  It is possible, I don't know.

  Firewalls can certainly affect communication between different PC whehter is a firewall in the routers on the network or in the Windows Firewall.  It is therefore useful to check in one more.  But as you say, I see nothing wrong with the code.