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ELK-M1DBH Odd Behavior
Posted 28 August 2012 - 08:19 PM
I have an ELK M1 Gold with ELK-M1DBH Data Bus Hub. I have 3 M1KP2 Keypads, a ELK-M1XIN 16 Zone Expander and a ELK-M1XSP Serial Port Expander.
The keypads will only properly enroll when attached on the data hub to postions 1, 2 and 3 respective to thier addresses. For instance, if I move Keypad 1 to position 3 none of the keypads will enroll.
If the keypads are properly matched to the correct positions, the Zone or Serial Expander will both work in position 4 but neither will work in postion 5 when the other is attached in front of it.
None of the devices are teminated on the device, the JP3 is in place on the M1 as well as the terminating plug on the data hub. I've tried changing device addresses to no avail. For some reason I cannot get all 5 devices working at the same time!
Does anyone have any suggestions?
Posted 30 August 2012 - 07:40 AM
Posted 30 August 2012 - 08:20 AM
You could try to plug/unplug devices and look for bus errors incrementing and maybe narrow it down. But take a good look at your terminations and see if any look unusual, RJ45 and the xsp/xin,reterminate the RJ45's one at a time, if that doesn't help then you need to investigate your in wall keypad terminations as a last resort.
I suppose there might be a way to hook in a multimeter and maybe measure the bus resistance and see if plugging in one of the devices makes it jump or something to determine the bad termination. Not sure what that should normally be or the limits are though...
Edited by wuench, 30 August 2012 - 08:21 AM.
Posted 01 September 2012 - 03:23 PM
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