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Original question:

Replace RS485 with PLC design information

SN65HVD1786: RS485 to PLC

Amelie Zheng
Genius 10865 points
Part Number: SN65HVD1786
Other Parts Discussed in Thread: SN65HVD63

Hi Team,

My customer want to select a chip for change RS485 to PLC.

Only for DC not for AC

 Power supply :5V or 3.3V

Carrier dc 12 or 24 VDC.

Or do we have solution to replace SSC P485 as attached file?

SSCP485_DataSheet.pdf

  • 0
    TI__Guru 62920 points

    Hi Amelie, 

    You might consider the SN65HVD63 device, which is an on-off-keying modem.  It was designed for AISG (antenna interface) applications, but the modulation scheme does allow for coupling of the RF signal onto DC lines for PLC applications.  (You would connect using a "bias tee" circuit where the RF data couples to the line via a capacitor and the DC power couples to the line via an inductor.)

    At higher baud rates it is possible to send differential RS-485 signaling over power lines.  You can see a reference for this here:

    http://www.ti.com/tool/TIDA-010035

    Note that this may require some encoding of the data in order to be AC coupled without significant distortion or data loss.

    Regards,
    Max

  • 0 in reply to Miguel Robertson
    TI__Genius 10865 points

    Hi Max,

    Thanks for your reply.

    What I want to find is a Modulator (UART to PLC)...as following. Customer want to replace SSC P485

    The application is customer want to design a transferred interface so that they can connect the car with PC to  diagnose or debug.

    Their signal chain is RS485→MCU→Modulator (UART to PLC) ...

    Any device recommend?

    Thanks!

  • 0 in reply to Amelie Zheng
    TI__Mastermind 25705 points

    Amelie,

    As Max mentioned, TI doesn't have direct replacement for SSC P485. One possible solution would be SN65HVD63 that OOK modulates the TTL signal to about 2MHz, which is similar to SSC P485's 'chirp' (ASK) function. However due to the different output buffer, you may want to redesign the interface with SSC P111. Please let us know if you have more questions.

    Regards,

    Hao