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CP343-1 Communication with other station

2/20/2011 11:19 AM	Rate (0)
autom Posts: 89 Rating: (1)	Hello to everyone, In my project i want to communicate with a other station over TCP. I have one CP343-1 and i use AG_SEND(FC5) and AG_RECV(FC6) to communicate with other station. in netpro the connection is etablished and is ok and also i can send data to other station but i cant receive nothing. The other station seems to send me data (SND led from other station is blinking) but i can't received it. The other station sends me data when i ask him something. The satus of AG_RECV was 8181H (Job Active) at the begin,,,, and now, because i have done several changes is 80B1H destination area inavlid (i change the length of the db several times). The data that i want ro receive is about 100 bytes and my datablock has 1000 bytes free space. Also the port that i use for other station is 30100 and the port that i use in CP343-1 is 2007. Any help will be great, Thangs.
autom Posts: 89 Rating: (1)
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2/20/2011 1:25 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/15/2025 Posts: 3042 Rating: (1061)	Hello autom I wonder if you have agreed on a fixed (static) message lenght with the Sender of the TCP data. It seems you haven't as you are trying different receive DB lenght and I fear you won't succeed until you either agree on afixed message lenght, or implement a mechanims to add the message lenght to the data or see if the other can side can tolerate an ISO-on-TCP connection. If you have however agreed on a fixed message lenght, you must make sure to let AG_RECV know about the lenghtvia the ANY pointer that you assign to the "RECV"Parameter of the call. I hope this helps and below are a few further links with more technical background on the above. What properties, advantages and special features does the TCP protocol offer? What properties, advantages and special features does the ISO-on-TCP protocol offer? Why under certain circumstances are there very long response times with TCP connections? Transferring data with variable message lengths via the TCP protocol
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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