I am developing a software program that communicates with an MKS PDR900. It connects to a computer with an RS232 straight though cable from the controller. I need to test the software but I don't have the controller physically connected to my computer. I have also created a mock program that simulates the PDR900. The 2 programs need to communicate with each other through a com port. My problem is the com port emulators I have tried are all null modem (cross over) and I need straight through. Does anyone know of an emulator that can be configured as straight through cable?