› M1 Support Forum › 1141 = Expansion Module Trouble Message

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  • October 24, 2025 at 3:01 pm #9627
    Gary Hansen

      A client with an M1G which I installed several years ago has been encountering a number of errors for “1141 = Expansion Module Trouble.” Each trouble message is followed by a “1161 = Expansion Module Restored” message. the Extended Data for both is “Input Exp. 2.” In one instance powering off the panel and powering it back on resulted in a 5 hour period of no error messages. What should I look for?

      October 27, 2025 at 12:29 pm #9631
      Brad Weeks

        The ELK M1 Gold supervises the data bus and each device connected to the data bus. If a bus device fails to check-in the M1 will Log Expansion Module Trouble and when the device does check in the M1 will Log a Restoral of that bus device. Several reasons why a bus device might fail to check-in could include a voltage drop at the bus device, issues with the data across Data A and Data B, noise on the data bus or perhaps a faulty bus device. The voltage at each bus device should be ~12-14 VDC. There are three methods to wire the M1 Data Bus 1) M1DBH Data Bus Hub which requires a Cat5/6 from the M1DBH all the way to each bus device, 2)M1DBHR Data Bus Retro Fit Hub for existing 4-Conductor Home Runs, 3) Daisy Chaining Bus Devices. There should Never be more than two home runs connected to the M1 Data Bus. With the M1 powered off including any secondary power supplies powering Bus Devices measure the resistance across Data A and Data B at the M1 Main Board — you should measure ~60 – 70Ω Ohms. A reading of 120Ω Ohms means you are missing a terminating jumper on the data bus and a reading of 40Ω or less would indicate too many terminating jumpers are installed.

        October 27, 2025 at 4:04 pm #9634
        Gary Hansen

          Brad, thank you very much.

          November 13, 2025 at 10:41 am #9674
          Gary Hansen

            Brad, my client continues to have the problem I have described above. I ran Menu 8 6 from the most commonly used keypad and got a “DataBusErrors Retry T2A2 01925” response. The system had run fine for many years with no such error, and nothing had been changed for some time previous to receiving the errors. No jumpers had been added or removed. There have been no changes in any of the wiring. The system has a single ELK-M1XRF2H expansion module and 2 ELK-M1KP2 keypads. What should I check?

            November 14, 2025 at 12:41 pm #9676
            Brad Weeks

              Does the Missing Expansion Module happen at certain times for example 12:00 AM, 4:00 AM, 8:00 AM, 12 PM, 4:00 PM , 8:00 PM?  Check the voltage at the M1XRF2H to make sure it is 12 – 14 VDC. Have you tried replacing the M1XRF2H?

              December 4, 2025 at 2:01 pm #9710
              Gary Hansen

                Brad, Thanks for the reply.

                It does it a random times. I can provide a spreadsheet that contains a segment of the log for this unit. The expansion module is daisy chained to the data bus along with one of the keypads.

                I went over to the client’s house to check the voltage for the ELK-M1XRF2H expansion module. It was installed a long time ago, and there has been some remodeling done in the house. Consequently, I was unable to find the module. Are you able to offer any suggestions?

                In your reply from October 27, you suggested “With the M1 powered off including any secondary power supplies powering Bus Devices measure the resistance across Data A and Data B at the M1 Main Board — you should measure ~60 – 70Ω Ohms.” In a situation like this, is there a secondary power supply providing power to the expansion module?

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