 TCP Communication between VB and LV, TCP with Visual Basic and LabVIEW |
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 Sep 1 2008, 08:13 PM
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#1
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 More Active  Member Posts: 25 Joined: 16-October 07 From: São Paulo Member No.: 9617 Using LabVIEW Since:2006 LV:8.5 ,8.2.1 ,8.0 
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Hi,
I have a compiled program (not mine) in VB which acts as a server that receives commands from my LabVIEW application via TCP port. So, these programs run in differents computers in a local network. They works fine when the two computers are Windows. If my LabVIEW program runs on Linux, it is not able to establish a communication with the VB program. The cause of the problem maybe that the VB program uses Winsock? I already tested my connection between a Linux and a Win computer using the examples TCP communicator, so the connection is fine. Thanks!
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Sep 1 2008, 08:13 PM
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Sep 1 2008, 08:25 PM
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#2
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 Extremely Active Member Posts: 361 Joined: 6-February 07 From: Homburg/Germany Member No.: 7689 Using LabVIEW Since:2004 LV:8.5 ,8.0.1 ,. 
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May be you can try to use Data Socket VIs insted of TCP/IP ?
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Sep 1 2008, 11:48 PM
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#3
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 Extremely Active Premium Member  Posts: 693 Joined: 3-November 04 From: Boston, MA Member No.: 949 Using LabVIEW Since:1999 LV:7.0 ,8.20 ,8.0 
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QUOTE (Giseli Ramos @ Sep 1 2008, 04:13 PM)  I already tested my connection between a Linux and a Win computer using the examples TCP communicator, so the connection is fine. This may be and endian problem, see here... -------------------- 
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Sep 2 2008, 04:20 AM
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#4
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 CCT It Premium Member Posts: 1337 Joined: 13-June 05 From: Woerden, Netherlands Member No.: 2399 Using LabVIEW Since:2001 LV:8.5.1 ,6.1 ,8.2.1 
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The problem is that you can't establish a connection. Strange, what error code is generated on the LabVIEW side?
Ton --------------------
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Sep 2 2008, 10:28 AM
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#5
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More Active Member Posts: 25 Joined: 16-October 07 From: São Paulo Member No.: 9617 Using LabVIEW Since:2006 LV:8.5 ,8.2.1 ,8.0
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QUOTE (Ton @ Sep 2 2008, 01:20 AM) The problem is that you can't establish a connection. Strange, what error code is generated on the LabVIEW side? Ton When I try to connect to the VB server using LV, it simply don't connect, I get timeout. Eugen, I tried something with DataSocket, but I'm not satisfied and really want to use TCP things. Don't have any way really? Philip, thanks for the tip. I will see here if is this problem and will post here the results.
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Sep 2 2008, 10:53 AM
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#6
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CCT It Premium Member Posts: 1337 Joined: 13-June 05 From: Woerden, Netherlands Member No.: 2399 Using LabVIEW Since:2001 LV:8.5.1 ,6.1 ,8.2.1
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QUOTE (Giseli Ramos @ Sep 2 2008, 12:28 PM) When I try to connect to the VB server using LV, it simply don't connect, I get timeout. Do you have the right port and number? It looks like there is no-listening at that port. Could you post a screenshot? Ton --------------------
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Sep 2 2008, 11:26 AM
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#7
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More Active Member Posts: 25 Joined: 16-October 07 From: São Paulo Member No.: 9617 Using LabVIEW Since:2006 LV:8.5 ,8.2.1 ,8.0
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QUOTE (Ton @ Sep 2 2008, 07:53 AM) Do you have the right port and number? It looks like there is no-listening at that port. Could you post a screenshot? Ton Well, I think that have listening, because my VB program succeeded to establish a communication when I use the example TCP Communicator in the same platform (win X win). The screenshot of the example is here. It doesn't work when is Win X Linux... Strange!
Attached thumbnail(s)
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Sep 2 2008, 11:58 AM
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#8
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 Active Member Posts: 23 Joined: 28-July 08 From: CT Member No.: 12118 Using LabVIEW Since:2005 LV:8.5.1 ,. ,. 
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QUOTE (Giseli Ramos @ Sep 2 2008, 07:26 AM) Well, I think that have listening, because my VB program succeeded to establish a communication when I use the example TCP Communicator in the same platform (win X win). The screenshot of the example is here. It doesn't work when is Win X Linux... Strange! I definitely don't think you should leave the TCP behind. This sounds more like an OS issue than a Labview issue. #1 What Flavor of Linux are you using. (I can be more helpful  )#2 My first suspicion is that you have a firewall blocking ports... Have you looked into this? -Scott
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Sep 2 2008, 12:16 PM
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#9
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More Active Member Posts: 25 Joined: 16-October 07 From: São Paulo Member No.: 9617 Using LabVIEW Since:2006 LV:8.5 ,8.2.1 ,8.0
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QUOTE (Scott Carlson @ Sep 2 2008, 08:58 AM) I definitely don't think you should leave the TCP behind. This sounds more like an OS issue than a Labview issue. #1 What Flavor of Linux are you using. (I can be more helpful )#2 My first suspicion is that you have a firewall blocking ports... Have you looked into this? -Scott Hi Scott, I'm using Fedora 7... and I'm glad that you remembered me of the firewall issue! On Linux, it is OK, but in Win, the firewall rules was not correctly applied...  Now it is working fine.  Many thanks to all and I learned some useful things in this topic such as the endian problem...
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