niHSDIO Configure Voltage VI
- Updated2023-02-21
- 16 minute(s) read
Configures the voltage levels for the data, trigger, and event channels. You can use either predefined logic families or custom voltage levels.
For more information about the voltage options available with your device, refer to Voltage Levels and Logic Families.
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Note NI-HSDIO returns an error if you use this VI with an NI 656x device. |
Related Topics
Data Voltage Logic Family
This instance of niHSDIO Configure Voltage configures the voltage levels for the data channels using a logic family. Refer to the device documentation for descriptions of logic families and possible voltage restrictions.
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Note The default logic level for all supported devices in acquisition and generation sessions is 3.3V. |

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instrument handle identifies your instrument session. instrument handle is obtained from the niHSDIO Init Acquisition Session VI, the niHSDIO Init Generation Session VI, or the niHSDIO Init Ext Cal VI. |
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channel list specifies which channels to apply settings to. Leave channel list blank to apply to all channels. |
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logic family specifies the settings for the instrument generation and acquisition operations.
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error in (no error) describes error conditions that occur before this node runs. This input provides standard error in functionality.
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instrument handle out passes a reference to your instrument session to the next VI. instrument handle is obtained from the niHSDIO Init Acquisition Session VI or the niHSDIO Init Generation Session VI. |
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error out contains error information. This output provides standard error out functionality.
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Data Voltage Custom Levels
This instance of niHSDIO Configure Voltage configures the voltage levels of the data channels using the specified high and low levels. Refer to the device documentation for possible voltage restrictions.
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Note If you are using an NI 6541/6542 device for generation sessions, you must set high level to the appropriate logic family value, and you must set low level to 0. For acquisition sessions with the NI 6541/6542, select the same value for high level and low level from the following list: 0.9 V, 1.25 V, or 1.65 V. |
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Note If you are using an NI 6544/6545/6547/6548 device for generation sessions, you must set low level to 0. For acquisition sessions with the NI 6544/6545/6547/6548, you must select the same value for high level and low level. |
When you use this VI, NI-HSDIO coerces the values you specify according to the voltage levels supported by your device. Refer to your device specifications for more information about the supported voltage levels. After you commit the session, you can read the Data High or Data Low properties to get the actual value of the configured custom levels.

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instrument handle identifies your instrument session. instrument handle is obtained from the niHSDIO Init Acquisition Session VI, the niHSDIO Init Generation Session VI, or the niHSDIO Init Ext Cal VI. |
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channel list specifies which channels to apply settings to. Leave channel list blank to apply to all channels. |
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high level specifies what voltage identifies high level. |
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low level specifies what voltage identifies low level. |
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error in (no error) describes error conditions that occur before this node runs. This input provides standard error in functionality.
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instrument handle out passes a reference to your instrument session to the next VI. instrument handle is obtained from the niHSDIO Init Acquisition Session VI or the niHSDIO Init Generation Session VI. |
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error out contains error information. This output provides standard error out functionality.
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Trigger Voltage Logic Family
This instance of niHSDIO Configure Voltage configures the voltage levels for the trigger channels using a logic family. Refer to the device documentation for descriptions of logic families and possible voltage restrictions.
![]() |
Note The default logic level for all supported devices in acquisition and generation sessions is 3.3V. |

![]() |
instrument handle identifies your instrument session. instrument handle is obtained from the niHSDIO Init Acquisition Session VI, the niHSDIO Init Generation Session VI, or the niHSDIO Init Ext Cal VI. |
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![]() |
logic family specifies the settings for the instrument generation and acquisition operations.
|
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![]() |
error in (no error) describes error conditions that occur before this node runs. This input provides standard error in functionality.
|
||||||||||||||
![]() |
instrument handle out passes a reference to your instrument session to the next VI. instrument handle is obtained from the niHSDIO Init Acquisition Session VI or the niHSDIO Init Generation Session VI. |
||||||||||||||
![]() |
error out contains error information. This output provides standard error out functionality.
|
Trigger Voltage Custom Levels
This instance of niHSDIO Configure Voltage configures the voltage levels of the trigger channels using user-defined high and low levels. Refer to the device documentation for possible voltage restrictions.
![]() |
Note If you are using an NI 6541/6542 device for generation sessions, you must set high level to the appropriate logic family value, and you must set low level to 0. For acquisition sessions with the NI 6541/6542, select the same value for high level and low level from the following list: 0.9 V, 1.25 V, or 1.65 V. |
![]() |
Note If you are using an NI 6544/6545/6547/6548 device for generation sessions, you must set low level to 0. For acquisition sessions with the NI 6544/6545/6547/6548, you must select the same value for high level and low level. |
When you use this VI, NI-HSDIO coerces the values you specify according to the voltage levels supported by your device. Refer to your device specifications for more information about the supported voltage levels. After you commit the session, you can read the Trigger High or Trigger Low properties to get the actual value of the configured custom levels.

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instrument handle identifies your instrument session. instrument handle is obtained from the niHSDIO Init Acquisition Session VI, the niHSDIO Init Generation Session VI, or the niHSDIO Init Ext Cal VI. |
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![]() |
high level specifies what voltage identifies high level. |
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low level specifies what voltage identifies low level. |
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![]() |
error in (no error) describes error conditions that occur before this node runs. This input provides standard error in functionality.
|
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![]() |
instrument handle out passes a reference to your instrument session to the next VI. instrument handle is obtained from the niHSDIO Init Acquisition Session VI or the niHSDIO Init Generation Session VI. |
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![]() |
error out contains error information. This output provides standard error out functionality.
|
Event Voltage Logic Family
This instance of niHSDIO Configure Voltage configures the voltage levels for the event channels using a logic family. Refer to the device documentation for descriptions of logic families and possible voltage restrictions.
![]() |
Note The default logic level for all supported devices in acquisition and generation sessions is 3.3V. |

![]() |
instrument handle identifies your instrument session. instrument handle is obtained from the niHSDIO Init Acquisition Session VI, the niHSDIO Init Generation Session VI, or the niHSDIO Init Ext Cal VI. |
||||||||||||||
![]() |
logic family specifies the settings for the instrument generation and acquisition operations.
|
||||||||||||||
![]() |
error in (no error) describes error conditions that occur before this node runs. This input provides standard error in functionality.
|
||||||||||||||
![]() |
instrument handle out passes a reference to your instrument session to the next VI. instrument handle is obtained from the niHSDIO Init Acquisition Session VI or the niHSDIO Init Generation Session VI. |
||||||||||||||
![]() |
error out contains error information. This output provides standard error out functionality.
|
Event Voltage Custom Levels
This instance of niHSDIO Configure Voltage configures the voltage levels of the event channels using user-defined high and low levels. Refer to the device documentation for possible voltage restrictions.
![]() |
Note If you are using an NI 6541/6542 device for generation sessions, you must set high level to the appropriate logic family value, and you must set low level to 0. For acquisition sessions with the NI 6541/6542, select the same value for high level and low level from the following list: 0.9 V, 1.25 V, or 1.65 V. |
![]() |
Note If you are using an NI 6544/6545/6547/6548 device for generation sessions, you must set low level to 0. For acquisition sessions with the NI 6544/6545/6547/6548, you must select the same value for high level and low level. |
When you use this VI, NI-HSDIO coerces the values you specify according to the voltage levels supported by your device. Refer to your device specifications for more information about the supported voltage levels. After you commit the session, you can read the Event High or Event Low properties to get the actual value of the configured custom levels.

![]() |
instrument handle identifies your instrument session. instrument handle is obtained from the niHSDIO Init Acquisition Session VI, the niHSDIO Init Generation Session VI, or the niHSDIO Init Ext Cal VI. |
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![]() |
high level specifies what voltage identifies high level. |
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![]() |
low level specifies what voltage identifies low level. |
||||||
![]() |
error in (no error) describes error conditions that occur before this node runs. This input provides standard error in functionality.
|
||||||
![]() |
instrument handle out passes a reference to your instrument session to the next VI. instrument handle is obtained from the niHSDIO Init Acquisition Session VI or the niHSDIO Init Generation Session VI. |
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![]() |
error out contains error information. This output provides standard error out functionality.
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