› M1 Support Forum › M1DBBHR Data Bus Retrofit configuration › Reply To: M1DBBHR Data Bus Retrofit configuration
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.
