Frequently Asked Questions for the NI SCXI-1600 USB Data Acquisition and Control Module

Publish Date: Jul 22, 2015 | 0 Ratings | 0.00 out of 5 | Print

Table of Contents

  1. How can I import/export SCXI-1600 configurations to/from different computers?
  2. Can I daisy-chain SCXI chassis using a USB SCXI 1600?
  3. Can I use the SCXI-1600 In any slot in my SCXI chassis?
  4. Can I use the SCXI-1600 in a Multi-Chassis Configuration?
  5. Can I use the SCXI-1600 with an SCXI-1180 feedthrough panel module?
  6. Can I simulate the SCXI-1600 with NI-DAQmx?
  7. Does the 352 channel limit on the SCXI-1600 include both analog and digital channels?
  8. What is PFI 7 on the SCXI-1600 used for?
  9. Can I use an SCXI-1600 to control my chassis in parallel mode?
  10. Why doesn't my SCXI-1600 show up in Vista 64-bit or Windows 7 64-bit?

1. How can I import/export SCXI-1600 configurations to/from different computers?

The SCXI-1600 provides a unique connectivity option for SCXI users by putting the DAQ device in the SCXI chassis rather than tethered to a PCI or PXI DAQ device. The USB protocol provides plug and play compatibility for SCXI-1600 based SCXI systems; when connected, the chassis will be automatically detected by the operating system.

In a typical SCXI system in which a PCI or PXI MIO board controls the chassis, the chassis must be manually added in MAX. Since the SCXI-1600 is automatically detected, chassis assignment to a particular DAQ device is inherently different for SCXI-1600 chassis. This difference in expected behavior can cause trouble when importing MAX configurations for SCXI systems.

When importing an SCXI-1600 configuration, you may see the following under Devices and Interfaces: your currently connected SCXI system has changed names and a new disconnected SCXI system shows up.

Workarounds for exporting/importing tasks associated with SCXI-1600 modules and moving them to other systems.

•  Option 1:
Export the configuration information as a .ini or .txt file and delete the SCXI-1600 information from it.  Then import it on the target system and add the SCXI-1600 manually by changing its name to match the device name given in the task you just imported.

•  Option 2:
Create a new DAQmx task constant in LabVIEW VI and select the 1600's task. Right-click the constant and choose Generate Code » Convert to Express VI to create a preconfigured DAQ Assistant. Save the VI and move it to the target system. Open the VI on the target computer and right click the DAQ Assistant and choose Convert to DAQmx Task.  In MAX, add the SCXI-1600 manually and change its name to match the device name given in the task you just imported.

•  Option 3:
Delete the SCXI-1600 in the host system but keep the tasks that were associated with it. Export the task data (which now contains no information about the 1600 hardware) and import it on the target system. Add the SCXI-1600 manually and change its name to match the device name given in the task you just imported

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2. Can I daisy-chain SCXI chassis using a USB SCXI 1600?

No. The SCXI-1600 is not designed to control more than one SCXI chassis. If you need to control more than one SCXI chassis from a single device then you should use a PCI or PXI Multifunction DAQ device instead of the SCXI-1600 to control your chassis.

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3. Can I use the SCXI-1600 In any slot in my SCXI chassis?

Yes, the SCXI-1600 can be plugged into any available chassis slot to provide data acquisition and control capabilities.

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4. Can I use the SCXI-1600 in a Multi-Chassis Configuration?

Supported / Non-supported multi-chassis configurations:


1. Daisy Chaining (Not Supported)
The SCXI-1600 does not support Daisy Chaining with other SCXI chassis, which means that you will not be able to include channels which are controlled by the SCXI-1600 in the same DAQmx task that includes channels controlled by other DAQ boards. There is also no way to directly use or connect the SCXI-1600 with any SCXI chassis outside of the one in which it is located, but there are a couple of ways to synchronize the SCXI-1600 with other acquisitions.


2. Asynchronous Simultaneous Acquisitions (Supported)
Tasks that include modules controlled by the SCXI-1600 can run in parallel with any task running on any other Data Acquisition board in your system. Since NI-DAQmx supports multi-threading, no additional programming is necessary to run acquisitions like this at the same time. The drawback to this method is that the start-time and rate for the acquisition will not be synchronized, which makes correlating data difficult.


3. Synchronized Simultaneous Acquisitions (Supported)
Synchronizing simultaneous acquisitions is made possible by using a start trigger and/or by sharing the acquisition clock. The SCXI-1600 exposes two lines that can be used to synchronize the SCXI-1600 with other acquisitions on the hardware level:


1. PFI 0
This line can be used to trigger an acquisition.


2. PFI 7
This line can be use to export or import the acquisition clock, which can be used to synchronize the SCXI-1600 with any shared clock signal from other acquisitions.

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5. Can I use the SCXI-1600 with an SCXI-1180 feedthrough panel module?

The SCXI-1600 may be used instead of an E-Series or M-Series DAQ board for digitizing data obtained through signal conditioning modules in an SCXI chassis. Unlike the multifunction DAQ devices that can also be used for obtaining data from an SCXI chassis, the SCXI-1600 does not have extra unused analog inputs and outputs that can be routed out to an SCXI-1180 Feedthrough Panel for additional acquisition/generation.

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6. Can I simulate the SCXI-1600 with NI-DAQmx?

NI-DAQmx does not support simulating the SCXI-1600 module.

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7. Does the 352 channel limit on the SCXI-1600 include both analog and digital channels?

No, the 352 channel limit only refers to the number of analog input channels.

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8. What is PFI 7 on the SCXI-1600 used for?

As an output, PFI 7 is the AI Sample Clock signal on the SCXI-1600 and can be used on SCXI modules that have a track and hold such as the SCXI-1520. It is used as the hold trigger that is used by the MIO to set the track and hold state of the module. The PFI 7/AI SAMP CLK signal reflects the actual start pulse that initiates a scan. This is true even if the starts are externally triggered by another PFI.   Since PFI 7/AI SAMP CLK is intended for sample and hold, it should never be used as a start trigger and may cause a computer to crash.

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9. Can I use an SCXI-1600 to control my chassis in parallel mode?

The SCXI-1600 is not a multifunction DAQ device so it only has the I/O lines required to control an SCXI chassis.  It does not have enough analog inputs to run in parallel mode.  However, you can still run one module in parallel mode (connected to a DAQ card on your PC), even though you are using the SCXI-1600 to multiplex your signals from other modules and control the chassis.

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10. Why doesn't my SCXI-1600 show up in Vista 64-bit or Windows 7 64-bit?

The SCXI-1600 is not supported in Windows 64-bit. For USB support of SCXI on a Windows 64-bit operating system, use a USB mass termination DAQ device with 3 ports of DIO.  Potential devices include the USB-6259 Mass Term, USB-6251 Mass Term, USB-6361 Mass Term and USB-6363 Mass Term.


Related Links:
Product Manuals:  SCXI-1600 User Manual and Specifications
Product Manuals:  SCXI Quick Start Guide (Multilingual English, French,& German)
Product Manuals:  Getting Started with SCXI

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