What PXI Hardware Is Required To Implement Modbus Communication?

Updated Dec 29, 2022

Reported In

Hardware

  • PXI-8231
  • PXIe-8430/8
  • PXI-8432/2
  • PXIe-8431/8
  • PXI-8433/2

Software

  • LabVIEW

Issue Details

I need to get data from and control Modbus Slaves using PXI platform. What PXI hardware I should use?

Solution

Modbus communication can be realized using any hardware, which allows transmission over TCP/IP, RS-232, RS-422 or RS-485.

TCP/IP communication can implemented with the following hardware:
  • PXI controller with Ethernet port
    • NI PXIe-8880
    • NI PXIe-8840
    • NI PXIe-8135
  • PXI Ethernet Interface Module
    • PXI-8231
    • PXI-8231
RS-232 communication can implemented with the following hardware:
  • PXI controller with RS-232 serial port
    • NI PXIe-8840
    • NI PXIe-8135
  • PXI Serial Interface Module
    • PXI-8430
    • PXIe-8430
    • PXI-8432
RS-422 or RS-485 communication can implemented with the following hardware:
  • PXI Serial Interface Module
    • PXI-8431
    • PXI-8433
    • PXIe-8431

Additional Information

Modbus is an application layer messaging protocol for client/server communication between devices connected on different types of buses or networks, such as:
  • TCP/IP over Ethernet
  • Asynchronous serial transmission over RS-232, RS-422, RS-485
Check out this white paper for a primer on using Modbus with LabVIEW, and view information on NI Modbus APIs here.

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