NI-9221 Getting Started

Connector Types

The NI-9221 has more than one connector type: NI-9221 with screw terminal, NI-9221 with spring terminal, and NI-9221 with DSUB. Unless the connector type is specified, NI-9221 refers to all connector types.

NI-9221 Connection Guidelines

  • Make sure that devices you connect to the NI-9221 are compatible with the module specifications.
  • You must use 2-wire ferrules to create a secure connection when connecting more than one wire to a single terminal on the NI-9221 with screw terminal or NI-9221 with spring terminal.

High-Vibration Application Connections

If your application is subject to high vibration, NI recommends that you follow these guidelines to protect connections to the NI-9221 with screw terminal or the NI-9221 with spring terminal:
  • Use ferrules to terminate wires to the detachable connector.
  • Use the NI 9927 backshell kit with the NI-9221 with screw terminal or the NI 9981 backshell kit with the NI-9221 with spring terminal.

Single-Ended Connections


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NI-9221 Pinout


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Table 1. Signal Descriptions
Signal Description
AI Analog input signal connection
COM Common reference connection
NC No connection

NI-9221 Block Diagram


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Input signals are scanned, buffered, conditioned, and then sampled by a single ADC.

Conformal Coating

The NI-9221 is available with conformal coating for additional protection in corrosive and condensing environments, including environments with molds and dust.

In addition to the environmental specifications listed in the NI-9221 Safety, Environmental, and Regulatory Information, the NI-9221 with conformal coating meets the following specification for the device temperature range. To meet this specification, you must follow the appropriate setup requirements for condensing environments. Refer to Conformal Coating and NI RIO Products for more information about conformal coating and the setup requirements for condensing environments.

Operating humidity (IEC 60068-2-30 Test Db) 80 to 100% RH, condensing