M1DBBHR Data Bus Retrofit configuration - ELK Products

M1DBBHR Data Bus Retrofit configuration

› M1 Support Forum › M1DBBHR Data Bus Retrofit configuration

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  • July 6, 2026 at 10:51 am #10325
    Gerald Schmidt

      Is the following configuration correct?

      Branch 1 – JP2 is terminated; M1KP2 keypad connected – JP1 is terminated

      Branch 2 – JP3 is not terminated; M1KP2 keypad connected – JP1 is terminated

      Branch 3 – JP4 is not terminated; M1XRFTWM transceiver/expander – JP1 is terminated

      Branch 4 – JP5 is terminated;  M1XSLC M1-to-Lutron Caseta – JP1 is terminated

      Thank you.

      July 7, 2026 at 8:36 am #10326
      Brad Weeks

        You have just one Bus Device per Branch? If so then JP2 – JP5 should have a terminating Jumper and each device should have a terminating Jumper. If this is the only home run from the M1 to the M1DBHR then you should have JP3 on the M1 terminated and JP1 on the M1DBHR terminated. With the M1 powered off measure the resistance across Data A and Data B at the M1 and across each Branch on the M1DBHR — you should measure ~60-70Ω Ohms of resistance.

        July 7, 2026 at 11:29 am #10328
        Gerald Schmidt

          Yes, I just have one Bus Device per Branch.  It is a relatively small installation.

          I configured the jumpers as you instructed and measured the resistance with the M1 powered off.  Every reading was within the 60 – 70 ohm range.  The M1 was 70 and the branches on the M1DBHR were 63.5 ohms, plus or minus .4 ohms.

          Thank you for your quick response and assistance.

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