RogueOne said:
Are EOL registers required for all wired sensors? Is it required for a single keypad?
Thanks
Which sensors require EOL resistors varies with the alarm panel. On some panels, if you use an EOL resistor on one zone, then you must use them on all zones.
On the Elk M1G, you can configure them zone by zone and use them only where you want.
You also need EOL resistors on any smoke detector zones. For 2-wire smokes, you need to use an 820 ohm resistor, rather than the 2.2k you would use on other zones. 4-wire smokes use 2.2k.
The Elk keypads connect to the data bus, which is different from a zone circuit. The data bus uses
terminating resistors rather than EOL resistors. The data bus needs to have exactly 2 terminating resistors on it. These are configured using jumpers on the M1G panel and the keypads (also zone expanders and the M1DBH, if you have those).
In simple terms, the two terminating resistors go at the two endpoints of the data bus. Understanding what an endpoint is is the tricky part.
For a single keypad and no other data bus devices, you put a jumper on JP3 on the M1G and also on the one keypad.
Refer to the manual for more information on this, and how to configure the jumpers for other situations.