GARDTEC 816 - Zone Expander Cards

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Zone Expander Cards
Two types of zone expander cards are available, the Gardtec 816 Expander Card that
may only be used on the 816 and the Gardtec 872 Expander that may be used on the
816/872.
Note: It is essential that NO sensor / detector is powered from the expansion board.
Use control panel AUX output or remote PSU.
Up to sixteen zone expander cards may be fitted to the Gardtec 872 and two on the
816 control panel. If required, one of these expander cards may be plugged directly
onto the the main PCB, the other expander cards then being wired to the plug-on card
as shown in Fig.29. Four cores are required for interconnection of the zone
expanders. If Output Expanders are to be used (872 only) on the same leg as
zone expanders an extra core will be required.
Fig. 29a Gardtec 872 Expander Card Wiring 'Daisy Chain' Format
872 872
Expander1 (Plugged on) Expander2 Expander3 To Others
12V 12V 12V
0V 0V 0V
SAD 1 SAD 1 SAD 1
SCLK SCLK SCLK
Fig. 30b Gardtec 816 Expander Card Wiring ‘Daisy Chain’ Format
Expander1 (Plugged on) Expander2
12V 12V
0V 0V
SADIN SADIN
SCLK SCLK
The expander cards may also be wired back to the onboard expander card in 'Star'
format (each expander card wired back individually).
Alternatively all the zone expander cards may be wired to the main PCB via an
optional zone expander cable Part No. 01-094. If the 816 Expander Cards are being
used two expander cables will be required. When using the zone expander cable the
following colours should be used (see Figs 30a, 30b).
If Output expanders are used (872 only) all SAD 2 connections should be on the first
group. If the expanders are remote from the main PCB a second expander cable will
be required to plug onto PCB EXP2 socket. The SAD2 connection on this second
cable is the black core.
PR5892 Rev11 800 Series Eng Ref 15.qxd 16/11/2006 11:20 Page 43