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What is the SCXI Module Priority if I Am Using More Than One Module?

Hardware: SCXI

Problem:
If I am using more than one type of module in a single SCXI chassis which module should I choose as the communicating module?

Solution:
Using Multiplexed Mode for All Modules

When setting up your chassis, the SCXI module with the highest priority should be connected to the cable adapter (i.e. SCXI-1349). If one of the modules in the chassis is capable of simultaneous sampling it has highest priority. When you cable to one of the modules without simultaneous sampling capability, you will get an error message when you run your application. If none of the modules in the chassis are capable of simultaneous sampling, choose the highest priority module by selecting the module that occurs first in the following list:

  1. SCXI-1520, SCXI-1530, SCXI-1531, SCXI-1540, SCXI-1140
  2. SCXI-1521/B, SCXI-1112, SCXI-1102/B/C, SCXI-1104/C, SCXI-1125, SCXI-1126, SCXI-1141, SCXI-1142, SCXI-1143, SCXI-1581
  3. SCXI-1120/D, SCXI-1121, SCXI-1100, SCXI-1122
  4. SCXI-1124, SCXI-116x
Using Both Modules Configured for Multiplexed and Parallel Modes

Each module configured in parallel mode will have its own cable adapter running to a DAQ device. Since the connected DAQ device will control only a single module it is not necessary to consider priority. For the remaining multiplexed modules choose the module with the highest priority as described in the previous section and attach the cable adaptor to the module.

Using Parallel Mode for All Modules

Each module configured in parallel mode will have its own cable adapter running to a DAQ device. Since the connected DAQ device will control only a single module it is not necessary to consider priority. Attach a cable adapter to each module.
Note: Only certain modules are capable of running in parallel mode. Refer to the knowledgebase article entitled Which SCXI Modules are Capable of Running in Parallel Mode? for more information.

Instructions for Connecting the Cable Adapter
  1. Insert cable into SCXI-1349 cable adapter
  2. Insert the 50-pin female connection on the rear of the cable adapter into the 50-pin male connector on the rear of the appropriate SCXI module.
    Caution Do not force the adapter if there is resistance. Forcing the adapter can bend pins.
  3. Fasten the adapter to the rear of the SCXI chassis with the screws provided with the SCXI-1349

For more information about configuring your SCXI Chassis refer to the SCXI Quick Start Guide.



Related Links:
Product Manuals: SCXI Quick Start Guide
KnowledgeBase 2AE7G1QO: Which SCXI Modules are Capable of Running in Parallel Mode?
KnowledgeBase 2FBFLE2H: Can I Use the SCXI-1180 Feedthrough Panel with an SCXI-1520 Module to Access My Unused DAQ Device Channels?

Attachments:





Report Date: 10/26/2004
Last Updated: 06/19/2008
Document ID: 3EPEELNS

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