Page 39
Zone Expander Cards
Up to sixteen zone expander cards may be fitted to the GardTec 872. 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. 30. Four cores
are required for interconnection of the zone expanders. If Output Expanders are
to be used on the same leg as zone expanders an extra core will be required.
The expanders are wired in two groups EXP1 to EXP8 use SAD1 and EXP9 to EXP16
use SAD2
Fig. 30a GardTec 872 Expander Card Wiring 'Daisy Chain' Format for EXP1 to EXP8
Group 1 872 872 To Other
Expander1 (Plugged on) Expander2 Expander3 Expanders
12V 12V 12V
0V 0V 0V
SAD1 SAD 1 SAD1
SCLK SCLK SCLK
If you intend to use Expanders 9 to 16 or any Output expanders also wire SAD2
terminals.
Fig. 30b GardTec 872 Expander Card Wiring 'Daisy Chain' Format for EXP9 to EXP16
From Group1 872 872 To Other
Expander Expander9 Expander10 Expanders
12V 12V 12V
0V 0V 0V
SAD 2 SAD 1 SAD 1
SCLK 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.. When using the zone expander cable
the following colours should be used (see Figs 31a, 31b).
If Output expanders or Group 2 Expanders are used SAD2 terminals should be used
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 yellow core.
GardTec 872
Wiring Connections
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