Elk M1 Adding P212S - Terminating bus

[Superjer2000]

First off, a THANK YOU to all of the contributors to this forum. I recently installed an M1G, M1XEP, M1DBHR, M1XSLZW, M1XIN, 2 x M1KP, 1 x M1KPNAV and an M1XRFEG connected to a C3 Communicator with zero hiccups thanks to all of the information I have gleaned from searching this forum. At present, everything is working great, including the Z-Wave with Kwikset locks and some lights. I have added about 15 hardwired zones and another 10 wireless zones and am adding more as time permits. Also when time permits, i will be adding in the M1RB, a flushmount M1KP2, some water sensors and 4 x FSA-410AST 4-wire smoke detectors.

When you add everything up (and correct for the missing M1KPNAV as noted here previously on the current draw worksheet) I would be running at around 1.3A and so I just ordered a P212S.

The easiest way for me to shed load off of the M1 as far as I can tell would be to insert the P212S before my M1DBHR which then connects to all of my bus powered devices.

Would it be better to:

1) Connect the P212S to the databus on the M1, so that would be the only databus item connected to the M1. I believe I would then need to keep the jumper on the system board to terminate the bus. Presumably I would NOT terminate the P212S but would then terminate the M1DBHR (as it is now).
2) Homerun both the P212S and the M1DBHR to the M1 Board, terminating both but removing the terminator from the M1 system board. I would then connect the + and - 12V input on the M1DBHR to a + and - 12V output on the P212S

Are there better ways to integrate the P212S?

Last question is on the M1RB which I have sitting uninstalled in bubble wrap - there is a ribbon type cable that connects to the M1 board that carries +12V. If I wanted to power that off of the P212S, can someone please confirm that the only way would be to cut the +12V wire and splice in the +12V from the P212S?

Thank you!!

 

[Del91574]

Without doing the calcs, I would run the bus as a single one off the panel, terminate at the panel then the last device/branch on the DBHR, leaving the bus devices on the 212 itself and powered devices/alarm points on the panel.

How it's integrated typically depends on where it's installed in relation to the data bus and what peripherals are attached. My own house uses 2 of them at the panel to loadshed there (3 more supplies in the field for other items). I've installed jobs with as many as 6 of them in the field, but how they're deployed is a function of what is connected and how in addtition to loadshedding.


Leave the RB powered off the panel via the plug/header.

 

[Superjer2000]

Thank you DEL,
Can you please confirm my understanding of your recommendation - and to add a bit more information, the P212S will be right next to the alarm panel.

Databus wiring would go from the Panel to the P212S then from the P212S to the DBHR? I believe that would then mean that the Panel would be terminated as would the DBHR.

My uncertainty came about looking at the manual for the DBHR which seems to allude to the notion that the DBHR should be directly connected to the Panel.

If I run into any issues, presumably I could run the P212S off of the DBHR but connect the +12V from the P212S to the +12V In on the DBHR?

Thanks again!

 

[Del91574]

Missed the part about the DBHR while quick reading, thought it was a passive DBH. The DBHR existed before the 212S, so it's not going to mention it.

The 212S can be put in before the DBHR, just land the +12V from the panel at the "spare" and then feed downstream bus devices from data A/B and +12V from the bottom of the supply.

The 212S is going to be passthru on the 485 and then the DBHR is going to make up the downstream branches.

Take a look at the last diagram on the DBHR white paper, that's essentially what you're doing, but putting a "keypad" between the two.