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Author Topic: daisy chaining?  (Read 914 times)
opticalc
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« on: Oct 29, 12, 11:45AM »

How do you even daisy chain, given the devices only have 1 connector?  Say you wanted to daisychain a keypad in between the M1G and a input expander.  Its not like the keypad has an additional connector to plug the expander into to complete the daisy chain.



The keypad doc shows another diagram with splicing, but IMO this isnt really daisy chaining.  In the case of a splice, you're not passing through the keypad like the diagram shows.

But if they are using the term daisy chain to mean splicing off of a keypad connection just before the cable gets to the keypad, then I assume the "end device" that you should then jumper to term the bus then is really just the device the longest distance from the splice?
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jpmargis
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« Reply #1 on: Oct 29, 12, 12:52PM »

But if they are using the term daisy chain to mean splicing off of a keypad connection just before the cable gets to the keypad, then I assume the "end device" that you should then jumper to term the bus then is really just the device the longest distance from the splice?

This is correct!  RS-485 is more correctly called a multi-drop bus, but for some reason the security and automation community has chosen to use the term daisy chain for the interconnect.  Just be sure to keep the stubs short.
« Last Edit: Oct 29, 12, 01:19PM by jpmargis » Logged
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