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TRS3232: TRS3232 Application Problem

Kuo Duke
Expert 2040 points
Part Number: TRS3232
Other Parts Discussed in Thread: MAX3232E,

Hi Sir,

I have question about TRS3232, since current customer test our TRS3232, find it can not support all cable.

maybe A cable test pass but B cable fail.

May I know have any idea can explain this phenomenon or suggest suitable solution? such as best driving ability?

Thanks.

  • 0
    TI__Guru 62920 points
    Hi Kuo,

    Do you think it would be possible to measure the received signal at the end of a working cable and a failing cable so that they could be compared? This would give us a better understanding of what is going wrong. The problems could be related to signal loss (due to longer/more resistive cabling) or could be due to other issues (poor connections, mis-wirings, etc.).

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    Expert 2040 points
    Hi Sir,

    Sorry, I have no idea how to measurement which pin waveform....
    Could you provide your suggestion? I can measurement waveform for you .

    Thanks
  • 0 in reply to Kuo Duke
    TI__Guru 62920 points
    Kuo,

    The transmitting side's DOUT pins will connect to certain wires, and these will connect to the RIN pins of the receiving side at the other end of the cable. It would be good to measure them both to see what issues might be introduced by the cabling. You can use an oscilloscope to do this. Just make sure that you don't plug the signals into a 50-Ohm input on an oscilloscope, since that will draw too much current from the RS-232 line. It is best to use a high-impedance input on the scope or use a scope probe with a high-impedance tip. (The scope should also be able to tolerate the RS-232 voltage range; otherwise, an attenuator could be used to lower the signal amplitude.)

    When observing the signals, the waveform at the receiving end should be similar to the waveform at the transmitting end (except perhaps with lower amplitude and slower edge transitions).

    Max
  • 0 in reply to Miguel Robertson
    Expert 2040 points
    Hi Sir,

    Thanks for you reply.
    May I know different about max3232E and trs3232E? since looks DS is same.....

    Regards,
    Duke
  • 0 in reply to Kuo Duke
    TI__Guru 62920 points
    Duke,

    These two devices are direct pin-for-pin functional equivalents of one another.

    Max