Hi there, I need to write a VB application that able to communicate with PLC (Programmable Logic Control). The PLC will send a binary signal to my VB program. In my VB program, i used MSComm control and pick one of the PC Comm Port. My program just need to receive signal from PLC. The problem is, i don't know how to make my VB to communicate with the PLC. Is it any related with VB addressing or something? Hope that u guys can help me here...Thanks all!!!

Regards, Jesse