As with all things serial, you need to start with the basics. Verify that the com settings (baud, parity, etc) match in both the program and in the hardware. Verify that you are using the correct type of cable. There are two general types - null-modem and straight through.
Before running the driver, you can check with a program like Hyperterminal. If it works there, then you can try the driver and that should work the same.
The VISA Resource Name has to match the serial port that you are connected to. Depending on the settings, the control will either show the canonical names (ASRL1::INSTR) or not (i.e. COM1). The little arrow on the right side of the control allows you to select from all of the ports available on your system.
When you run the VI, it is also important to note any error codes that might be reported.
The COM port address is given as shown in the device manager. The Getting Started VI file is initialised and the block diagram does not show any error message. When the filter is viewed against the tube light the filter is not responding to the specific wavelength given in the front panel.Since the error message is not shown is the liquid crystal tunable filter working properly or any change should be made to the getting started lab view files.How to trouble shoot the problem?
Your com port name should be what is given in MAX and not necessarily in device manager but since you don't get an error, the name is probably correct.
Did you oerform all of the troubleshooting steps I suggested? Check the type of cable? A wrong cable or wrong com settings will not result in an error when you write to a com port. Did you try Hyperterminal?