Read the commands being sent out on Ethernet port

I have a Keithley 3706 - S switcher, which is supplied with its own software. This software communicates with the device via TCP IP. I know that I could send packets using Matlab. I am trying to interact with a Keithley 3706 - S switcher via Matlab(R2007a) using the ethernet.

I need to know the structure of the commands being sent from the software to the device so that I can send the same structure using Matlab. Is there a way I can read what structure is being sent out on the ethernet port using Matlab so that, I could initiate the same directly from Matlab.

This is the product I am working with: http://www.keithley.com/products/switch/dmmswitch/?mn=3706-S

Answer 1

[Walter Roberson]

It is possible using the netcat libraries that underlie the tcpudpip user contributed program. Usually, though, you would use a program made for this purpose, as such programs can decode the tcp headers (which can be crucial.)

I suggest starting with windump