Tcp slave messages are not forwarded to rtu master
We are using lantronix XPress-DR IAP device to connect a modbus RTU Master to a Modbus TCP slave.The modbus RTU master requests are successfully getting converted in to TCP frames and the TCP Slave Gives the Valid Response to the Converter.But the Converter does not convert this TCP response in to RTU response.So the RTU master is not getting any reply from the Converter.Please let me know what is the probable cause and how to troubleshoot this problem
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Re: tcp slave messages are not forwarded to rtu master
I think your last sentence there might be what the situation really is. Your not getting a reply back. Maybe you should check the response timeout the gateway has set on it for the slave. You probably already know a slave’s response
time can fluctuate wildly depending on the
nature of the request sent, so maybe the timeout
setting is too short? Its a place to start. .
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LDP sessions are established based on TCP connections using MD5 authentication. The TCP connection cannot be established, if one end is configured with MD5 authentication while the other end is not, or the MD5 passwords on the two ends are different. If MD5 cipher text authentication is proprietary on other vendors' devices, Huawei devices cannot set up a TCP connection with these devices.
As far as I am aware, this is not possible without some additional hardware. Try looking at www.scadalink.com. They have a number of devices that may allow you to do this, especially if you are using MODBUS.
You need to forward these ports on both your router, and computer aswell as firewall you got one of those.
Port 88 (UDP)
Port 3074 (UDP and TCP)
Port 53 (UDP and TCP)
Port 80 (TCP)
You might aswell need to open 1863 (UDP and TCP) if you want to use video chat for the kinect. Listed ports need to be forwarded when connecting to XBOX Live A more detailed guide to setting it up is available here: http://support.xbox.com/en-us/xbox-360/networking/network-ports-used-xbox-live
Port-forwarding allows connections from the network, i.e., to TCP port #80 at the IP-address assigned to your router, to be "forwarded" (much like a switchboard operator at a university)
to any specific TCP port (but usually the identical port-number) on a SPECIFIC computer "inside" your network.
If your router is '192.168.0.1', then it probably will give-out IP-addresses like '192.168.0.100'
and '192.168.0.101', and '192.168.0.102' to the first 3 computers on your network.
So, "port-forwarding" is used to designate one of those 3 IP-addresses as the one to receive/process all the 'TCP port #80' traffic.
On the router's web-interface, on the "port-forwarding" page, just add an entry for 'TCP port #80'.