Re: 4208U

["Robert L Bass" <RobertLBass@xxxxxxxxxxx>]

The zones on the 4208U expansion board should
each be supervised using the 10K Ohm resistors
that came with the 4208U.

Have you set the address dip switches on the
4208U correctly?  Also, I assume you used twisted
pair wiring for the polling loop.  You don't need it for
analog sensors but it's required for the PL.

Here's an excerpt from the Vista-50P concerning the
polling loop:

The built-in polling loop has the following limitations that must be observed:

-- The maximum allowable current draw from the polling loop is 64mA. (Refer to the POLLING LOOP CURRENT DRAW WORKSHEET (found in
Section 15: FINAL POWER-UP PROCEDURE for current draws of various polling loop devices.) If devices total more than 64 mA, a 4197
Polling Loop Extender Module is required.

-- Regardless of current draw, no more than 64 devices can be connected to this loop. Installations which require up to 86 zones
will require the use of zone expanders which accommodate more than one zone per RPM device (4190WH (2 zones) or 4208 (8 zones)). If
more devices are needed, a 4197 Polling Loop Extender Module must be used.

The 4197 Polling Loop Extender Module may be used to provide additional polling loop current, to extend the polling loop wire run,
and/or to provide individual, electrically isolated polling loops...

--

Regards,
Robert L Bass

=============================>
Bass Home Electronics
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4883 Fallcrest Circle
Sarasota · Florida · 34233
http://www.bassburglaralarms.com
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> Hi, Two Ademco problems:
>
> I connected a 4208U to a Vista 50ADT Panel.  What should the zone type
> be for the 4208 (zones 10-16).  I tried "07" - referenced by DIP
> switch, and all the zones (which have the 10K resistors) come up as
> fault zones, with an addition zone 97 as a fault zone (based upon the
> 4208 faulting).  I do not have a resistor on the "A" zone which is not
> used when you use zones 9-16.  Resistance (before power applied comes
> up at approx. 9.8 K on my DVM (so I have the right resistors in).
> Each zone is homerun to a single window that has foil.  Is their an
> EOL that connects accross the polling loop, as the manual shows a
> picture of something coming out of the right side of the first 4208U
> (or is that just a symbol to mean protection zones)?  I also set the
> zones up with the same protection zone as the first 9, and as a
> perimeter zone (03).  On the 50P panel, I used 24 as + and 25 as -,
> however, why is there a "+" sign under pin 25?
>
> The second problem is that I wanted to change the default access code
> from 1234 to ABCD (meaning 4 different numbers).  Somehow I also
> changed the installer default code from 6*** to ABCD (my new security
> code).  How do I change the installer code back to 6*** and leave the
> security code unchanged?  Life was so simple using the Ademco 100
> series (a battery and 3 little relays (no electronics in the panel).
>