TCP Listener problems

[Chris D.]

I have been trying to read data from a PSI 8400 Chassis from Pressure
Systems by setting up a very simple VI containing a listener. I listen on
port 8400 ( as specified by the manufacturer ) and the VI gets stuck on the
listener as if there was not any data. Yet, an earlier test showed that if I
did a TCP Open followed by a TCP Read, I am able to recover all the data.
What am I doing wrong with the listener and why isn't picking up any data on
that port?
Any help in this area would be greatly appreciated. Thank you in
advance.
Chris D.

[JeanPierre]

A TCP listener waits for other devices to initiate (open) the TCP connection. Obviously, as your earlier test indicates, the device itself is a listener since it answers to TCP Open and Read. This is the way to communicate with the device. For the device to initiate the connection with your TCP Listener, it would need to know what is your IP address. Probably the manufacturer means to say: open a TCP connection and read (listen) data from the device.