Digital Lines, Ports, and Port Width

NI-DAQmx 18.6 Help

Edition Date: January 2019
Part Number: 370466AH-01
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Digital lines and ports are important parts of a digital input/output system.

  • Line—A line is an individual signal. It refers to a physical terminal. The data that the line carries are called bits, binary values that are either 1 or 0. The terms line and bit are fairly interchangeable. For example, an 8-bit port is the same as a port with eight lines.
  • Port—A port is a collection of digital lines. Usually, the lines are grouped into an 8-bit or 32-bit port.
  • Port Width—The port width refers to the number of lines in a port. For example, a device with one port with eight lines has a port width of eight.


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