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SN65LBC175: Frame Error

Ray Vincent Aranzaso
Mastermind 18180 points
Part Number: SN65LBC175

Hi,

Good Day. I have a customer who is working with SN65LBC175 and SN65C1167NSR. Please see below his query for your reference. Thank you very much.

We have an older product model that uses SN65LBC175 and a new product model that uses SN65C1167NSR. When the products talk to each other we find a lot of frame errors.

Basically, when we use the hardware with SN65C1167NSR to communicate with our hardware that use SN65LBC175, we see a lot of errors on the associated communication ports.

I figured this would start with comparting data sheets. For example, one IC supports 422A, 485, and ITU while the other only supports 422B. Could this be a limiting factor?

Best Regards,

Ray Vincent

  • 0
    TI__Guru 52432 points

    Hi Ray,

    Its possible this could cause issues - but it depends on system setup as in general RS-485 standard requires a more robust device -however there are cases where it should be fine. I have a few questions:

    1. Can you share a schematic of the communication network - ideally with all transceivers shown. 

    2. Can you give me the length of the transmission line between transceivers

    3.  What data rate is being used?

    4. Can they elaborate on the details of the frame error? Frame errors can be 100% software based or be hardware issues not related to the transmission/reception circuits - both of these devices do have the same max data-rate and there is no internal clock so you shouldn't have data rate mismatches from the transceivers themselves (a potential source of frame errors).

    5. If possible a scope shot of the input signal, the differential driver output, the differential receiver input, and singled ended receiver output? This will highlight any issues in signal chain to see if there is some issue that is being caused by the transceivers - it will show up  in the scope shots and could help direct focus to the problem area.

    Please let me know!

    Best,

    Parker Dodson