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Re: Unusual Challenge

Subject: Re: Unusual Challenge
From: ABLE1 <somewhere@xxxxxxxxxxx>
Date: Fri, 22 Oct 2021 16:13:23 -0400
Newsgroups: alt.security.alarms
References: <6y2cJ.3552$F97.541@fx47.iad> <sks8r7$esp$1@gioia.aioe.org> <QgmcJ.4665$Sja8.3999@fx35.iad> <7276c2d9-8ad5-418e-8af6-7a7e4b3e5911n@googlegroups.com> <cYpcJ.747$j47.23@fx38.iad> <-N6dnZ48nJFnru_8nZ2dnUU7-cnNnZ2d@giganews.com> <JuycJ.245$kw5.98@fx08.iad> <d6b6a5bf-d4d8-47e8-b027-a3071a266527n@googlegroups.com>

On 10/22/2021 1:18 PM, Jim Davis wrote:
> Re: The resistor. As I understand it, the closed circuit contact is wired from ground to the trigger terminal. Without a resistor, when the switch opens, the trigger terminal just goes from negative to "float". When you add the resistor, which is wired to the positive terminal when the switch opens, it "pulls" the trigger terminal to Positive. Which is a definite swing from negative to positive rather than to just to a float level. Changing component values on the relay PCB over the years could change the sensitivity level of he trigger input making the relay output of the board a "sometime" thing.


Yes, that does make sense.  The next time I am there on site I
will install a 1K resistor just to be safe.

Thanks!!

Les

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