Looping through visa resources

Question

I have a PXI Chassis that contains 8 serial cards.  For simplicity sake, say they're wired 1-2, 3-4, 5-6, 7-8.  So, basically, what ever I write to 1, I want to read at 2 - the same with the others.  I have the code that configures the com ports and writes/reads the data to one set of ports.  What I want to do, however, is somehow put this is a loop so as to have the com port number (enum) increment.  The two questions I have are:
1) If looping this way is the best way to go, how do I increment from COM port 1 to COM port 3.
2) On the PC where I'm developing, I just have COM1 and LPT1 that show up in my VISA Resource control drop down.  On the target, however, I know we have about 16  COM ports.  I want to test specific ones though.  Do I need to create some type of array of valid COM ports.  Is this something that I have to hard code or can I do it dynamically.

Answer 1

You can use the for loop but you probably don't want to auto-index. Maybe if you got the array size and divided by 2 and wired this to the 'N' terminal. Inside the for loop, use the index array function to get elements 0 and 1 the first iteration, 2 and three the next, etc. A shift register will retain the index value.
Message Edited by Dennis Knutson on 07-27-2006 11:57 AM
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