Advanced:Active Load:Active Load Mode Property

NI Digital Waveform Generator/Analyzer Help

Edition Date: June 2013

Part Number: 370520P-01

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Short Name: ActiveLoadMode

Property of niHSDIO

Specifies whether the driver should source or sink current instead of being in a high-impedance state. To enable active load functionality, you must first set the Tristate Mode or Termination Mode properties to High impedance . If the Tristate Mode or Termination Mode properties are set to Drive termination voltage , then you must set this property to Active Load Disabled or NI-HSDIO returns an error.

You must set this property to the same value on a channel in both acquisition and generation sessions, or NI-HSDIO returns an error. If you are using both acquisition and generation sessions in your application, when you select a value for this property in a session, NI-HSDIO automatically sets the same value in the other session. However, NI-HSDIO allows you to change the value only in the original session in which you configured it. For example, if you select Active Load Disabled in your acquisition session, your generation session is configured automatically to the same value. If you want to change the value to Active Load Enabled When Tristate , you can do so only in the acquisition session until you close the original session.

You can select the following PFI channels and clocks for the active channel input of the property node using these strings: PFI1 , PFI2 , STROBE , and DDC_CLKOUT . These strings are not case sensitive and can be grouped with the standard input strings separated by commas. The following are examples of valid string syntax: 0, 4, 6, PFI1, 7 or 0-12, STROBE, DDC_CLKOUT.

Note  Only NI 6556 devices support this property.

Related Topics

Active Load Disabled (96)

Disables active load functionality on this channel. The digital driver mode is determined by the option selected with Tristate Mode or Termination Mode property. This is the default value.

Active Load Enabled When Tristate (97)

Enables the sourcing or sinking of current when tristated.


The following table lists the characteristics of this property.

Datatype iL
High-level VIs N/A
Channel-based Yes


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