vb6 Code stuck

[mkashifk]

hi
i have designed a data acquisition software using VB6.
my software collects information from different electronic modules, for this purpose software sends request to electronics modules and then it sends back data to my software. sometimes during this send and receive operation my codes stuck and does not show any thing and after few seconds it starts automatically.
i need some help ,,
how can i know where my code stuck?
and
if my code is stuck then how can i break using watch dog timer?

thank you

[Luuk]

Your are not saying how they communicate....

If they (the program and the hardware) do that via HTTP, you should be able to via the communication with FIDDLER

If it's TCP, than you could use wireshark

[mkashifk]

thank you luuk,
i am using MODBUS Through RS485 for communication.
today i made some changes and found some satisfactory results.
i just Reset all memory registers of all external devises.

thank you