RAL said:If you have only 4-wire cable to the old existing keypad locations, then you should not be plugging those into a DBH. That's where you need to be using a DBHR.
There should not be more than 2 terminators on a data bus. If you use a DBHR, that creates multiple data buses, and then each bus from the DBHR should also have 2 terminators.
Thanks RAL. I think our posts crossed - see my one above. I see now that my initial install was incorrect. I've ordered a DBHR to make this right and will redo all my lines ensuring proper termination.
You and DEL have been very helpful. Thanks very much!