This content is not available in your preferred language.

The content is shown in another available language. Your browser may include features that can help translate the text.

Can You Implement RS-232, RS-422, or RS-485 with NI FPGA Hardware?

Updated Nov 28, 2022

Reported In

Hardware

  • RS-422/RS-485

Issue Details

I would like to implement RS-232, RS-422, or RS-485 serial protocol with an NI FPGA card. Is this possible and what are the considerations when attempting to implement these protocols?

Solution

Yes, you can implement RS-232, RS-422, and RS-485 protocols on NI FPGA cards. The main consideration is how to deal with the voltage levels of the signal when implementing RS-422 or RS-485. The DIO lines on most CompactRIO modules and R Series devices are single-ended 3.3V TTL, while RS-422 and RS-485 are differential voltage signals. To have a true RS-422/RS-485 interface you will need to add a signal translator between the FPGA card and your RS-422/RS-485 device(s).

An implementation of the RS-232 Interface using LabVIEW FPGA can be found in the following example.
 

Related Links

Other Support Options

Ask the NI Community

Collaborate with other users in our discussion forums



Request Support from an Engineer

A valid service agreement may be required, and support options vary by country.