CFP-2020 COM Ports 2 and 3 usage

Hi,
I'm working on an application that needs to control multiple instruments through serial interface.
I'm able to control this instrument through COM1, but when I take the same instrument and try to control it from COM2 I don't have any communication.  In fact, so far I have not even gotten a simple loop-back test to work on COM2.
Is there a clever way to verify that COM2 is writing anything out to COM2?  I'm using a custom RJ45-10position for the FP end, to an RJ45-8pos at the power supply side, (but this end I have a TXD to RXD loopback)
I've included the simple test VI I'm using as well incase this helps anyone.
Thanks for any help or suggestions,
Daniel
Attachments:
TEST - PS Conn.vi ‏24 KB

Hi!
daniel_vi wrote:
The cFP-2020 spec I
read that had the RJ45-10pos pinout seems to have the pin numbers
reversed.
    ...what do you mean?!?!?!? Here's the data you need to build the cable (RJ50, or 10 position RJ, don't call it RJ45 ):
   (From cFP-20xx User manual, april 2004 edition)
   So be careful to connect pin 9 and 8 to have a loopback, anc not 2 and 3 (okay unless you number from right )!!!
graziano
Message Edited by Graziano on 10-03-2008 02:12 AM
Attachments:
pin_10_RJ50.PNG ‏25 KB

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