send recieve data from etn21 via tcp

[paolo]

Good evening for everyone,i'm a new user.... I try to send and recieve data from etn21 via tcp with c# code.... with this method i create a new connection: private static Socket ConnectSocket(string server, int port) { Socket s = null; IPHostEntry hostEntry = null; hostEntry = Dns.GetHostEntry(server); foreach(IPAddress address in hostEntry.AddressList) { IPEndPoint ipe = new IPEndPoint(address, port); Socket tempSocket = new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp); tempSocket.Connect(ipe); if(tempSocket.Connected) { s = tempSocket; break; } else { continue; } } return s; } so return to me an istance of shoket.... after i send to etn21 this command: fins_tcp_header[0] = 0x46; fins_tcp_header[1] = 0x49; fins_tcp_header[2] = 0x4E; fins_tcp_header[3] = 0x53; fins_tcp_header[4] = 0x00;/* Length */ fins_tcp_header[5] = 0x00; fins_tcp_header[6] = 0x00; fins_tcp_header[7] = 0x0C; fins_tcp_header[8] = 0x00;/* Command */ fins_tcp_header[9] = 0x00; fins_tcp_header[10] = 0x00; fins_tcp_header[11] = 0x00; fins_tcp_header[12] = 0x00;/* Error Code */ fins_tcp_header[13] = 0x00; fins_tcp_header[14] = 0x00; fins_tcp_header[15] = 0x00; fins_tcp_header[16] = 0x00; fins_tcp_header[17] = 0x00;/* Client Node Add */ fins_tcp_header[18] = 0x00; fins_tcp_header[19] = 0x00; fins_tcp_header[20] = 0x00;/*AUTOMATICALLY GET FINS CLIENT FINS NODE NUMBER*/ s.Send(fins_tcp_header, fins_tcp_header.Length, 0); do { bytes = s.Receive(bytesReceived, bytesReceived.Length, 0); cli_node_no = bytesReceived[19]; srv_node_no = bytesReceived[23]; } and the etn21 response correctly : 80 (server node) and 239 (client node) and the TCP led on module is on so after i send the command to read 3 DM: fins_cmnd1[0] = 0x46; //'F'; fins_cmnd1[1] = 0x49; //'I'; fins_cmnd1[2] = 0x4E; //'N'; fins_cmnd1[3] = 0x53; //'S'; fins_cmnd1[4] = 0x00;/* Length */ fins_cmnd1[5] = 0x00; fins_cmnd1[6] = 0x00; fins_cmnd1[7] = 0x1A; fins_cmnd1[8] = 0x00;/* Command */ fins_cmnd1[9] = 0x00; fins_cmnd1[10] = 0x00; fins_cmnd1[11] = 0x02; fins_cmnd1[12] = 0x00;/* Error Code */ fins_cmnd1[13] = 0x00; fins_cmnd1[14] = 0x00; fins_cmnd1[15] = 0x00; fins_cmnd[16] = 0x80; /* ICF */ fins_cmnd[17] = 0x00; /* RSV */ fins_cmnd[18] = 0x03; /* GCT */ fins_cmnd[19] = 0x00; /* DNA */ fins_cmnd[20] = 0x50;//srv_node_no.ToString("x"); /* DA1 */ fins_cmnd[21] = 0x00; /* DA2 */ fins_cmnd[22] = 0x00; /* SNA */ fins_cmnd[23] = 0xEF;//cli_node_no.ToString("x"); /* SA1 */ fins_cmnd[24] = 0x00; /* SA2 */ fins_cmnd[25] = 0x07;//++sid; /* SID */ fins_cmnd[26] = 0x01; /* MRC */ fins_cmnd[27] = 0x01; /* SRC */ fins_cmnd[28] = 0x82; fins_cmnd[29] = 0x00; fins_cmnd[30] = 0x01; fins_cmnd[31] = 0x00; fins_cmnd[32] = 0x00; fins_cmnd[33] = 0x03; s1.Send(fins_cmnd, fins_cmnd.Length, 0); But here when i execute this command the TCP led on module turn off and the data recieved are incorrect What i mistake???? Can someone help to me???

[Berti Baker]

Hi Paolo, Wow! what a post I can't help you directly but as no-one else has any ideas I would suggest perhaps using some Ethernet Sniffer program and watching packets from Omron software to copy (as a test of your packet construction). If it was me though (as I'm a lazy ...) I would buy CX-Server Lite. It only costs €200-300 and includes a .Net communications control for C# and example programs. It also handles ALL PLCs, all the networks, and all the different protocols. For me... not worth my time developing it myself There is even a free demo version here Regards, Bertie.

[BobB]

Here is a link for Wireshark (formerly Ethereal) download - it is a free Ethernet sniffer http://www.wireshark.org/

[paolo]

Hi thanks a lot for your suggestion..during the holiday time i have develp a little internet application with remote web service (java and asp.net) for etn21 and it work very fine only an UDP protocol.... Maybe with the tcp protocol i mistake some instruction...I hope in the next to solve this problem... Thanks again Paolo P.S. Sorry about my english....

[hock]

your GCT is wrong.. is supposed to be 02 instead of 03