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Testing the Configuration of a RS-232/RS-485 SCXI System

Primary Software: Driver Software>>NI-DAQ
Primary Software Version: 6.9.3
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: SCXI

Problem: What are the necessary software configurations to consider when setting up a Remote SCXI system?

Solution:

Remote SCXI System Testing

Having completed the hardware and software configuration of the remote SCXI system, it is now time to perform system testing.

Chassis Verification
  1. Go to "Devices and Interface" in the Measurement and Automation Explorer (MAX) window. Right-click on SCXI chassis (SCXI-1000, or 1001, or 2000) and select "Test." Ensure that the SCXI-chassis is powered up.

  1. This test will check out the signal path to the chassis and determine if the modules inserted in the chassis match up with that shown in the MAX window. Note that depending on the speed of the serial link this test may take several minutes.
While the test is being carried out, you will notice activity on the LEDs located on either the SCXI-2000 chassis or the SCXI-2400 module.
  1. Once the chassis has been verified, the Online LED will remain lit and any communication between the host PC and the remote chassis will be indicated via the TX and RX LEDs.
  2. Should your chassis fail to be verified, check the following items:
    • Is the chassis switched on?
    • Is the cable between the host PC and the chassis suitable? Remember that a null modem cable is required for RS-232 communication and that terminating resistors are recommended for an RS-485 link.
    • Have the modules inserted in the chassis been correctly configured in MAX? If not, reconfigure.
    • Are the COM Port settings for either the SCXI-2000 or the SCXI-2400 correct? The default settings are 9600 baud, COM1. If you are using a serial mouse, this device will typically be using COM1. Verify that the baud rate set in the chassis/module configuration screen matches that on the chassis/module itself
    • Your SCXI-2000/2400 User Manual will give you further details about the use of the LEDs and the information they provide.
  3. Once the chassis is verified, Connect your transducer or voltage sources up to either the SCXI-1200 or the SCXI modules in your chassis and run the Test Panels by right-clicking on the SCXI-1200 module in MAX.
  4. Verify that you are able to detect your input signals using basic analog or digital I/O functions or VIs. If you are using additional SCXI modules, you have to type the appropriate channel string as shown below.

General format of the string: OBz!SCx!MDy!a
This will measure Channel a (a:b for scanning multiple channels) on the module in slot y of the chassis with ID x which is multiplexed into onboard channel.
 

Now that you are familiar with the software configuration, you can proceed to one of the links below to complete your understanding of setting up a remote SCXI system or return to Configuring a RS-232/RS-485 SCXI System.

  1. Hardware configuration
  2. Software configuration
  3. System testing

Once you are familiar with the steps necessary to use your remote SCXI system, feel free to visit our SCXI & Signal Conditioning Support page for additional documentation



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Report Date: 09/20/2006
Last Updated: 09/28/2006
Document ID: 41JCMM6A

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