Does NI 9871 have Port-to-port Isolation?

Updated Apr 21, 2025

Reported In

Hardware

  • NI-9871

Issue Details

The customer is looking for a high-speed RS-422/485 solution to be used in a noisy environment. They want to acquire information and tips to keep the system stable and as fast as possible.

  • Is there port-to-port isolation available for the NI 9871?
  • While the maximum speed is 3.68 Mbps, can we maintain this speed continuously? Is this speed divided among the four ports?

Solution

Port-to-port isolation is not available for the NI 9871.

Regarding speed, the specifications indicate that it cannot achieve 3.68 Mbps continuously on even one port. The maximum module throughput of 1.28 Mbps refers to the combined speed across all four ports.

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