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Re: ademco 4219 question

Subject: Re: ademco 4219 question
From: "Frank Olson" <feolson@xxxxxxxxxx>
Date: Sat, 13 Aug 2005 14:19:20 GMT
Newsgroups: alt.security.alarms
References: <B73Le.8$v27.446@xxxxxxxxxxxxxxx> <kB3Le.1230$Xw5.400@trnddc02> <_j9Le.33$v27.694@xxxxxxxxxxxxxxx> <IveLe.2843$vj.1465@pd7tw1no> <j4brf11b3m6fm2518lfb2i4rm2qvd1mef6@xxxxxxx>

"Robert L Bass" <sales@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:j4brf11b3m6fm2518lfb2i4rm2qvd1mef6@xxxxxxxxxx
>> I would recommend an independant power supply
>> for the remotely mounted zone expander, due to
>> the length of the wire run and the load of the
>> keypad and devices on the expander.
>
> If you do that, be sure nothing in the remote part of the system
> is earth grounded.  Otherwise, the first lightning ground strike
> in the area may take out your alarm system.


And don't forget to common the negative terminals

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