how to write a program with two interfaces in it?

[Nicky87]

Hi all,

i write two seperate programs which can control a step motor and read data from a sensor. the two setups are connected to pc by two different usb com ports.now i try to combine them to one program and run it. however, the motor control works properly and sensor reading doesn't. i tried to use different loops to make it happen but failed. btw, the com port option(sub VI) for motor control is done by an interface as shown below:

on the other hand, the com port option for sensor reading is done by I/O selector.

could anyone give me a solution?

[Albert.Geven]

please attach your code. Normally it is easy to have more than one interface supported.

LabVIEW glues instruments together.