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Use 18-gauge (AWG) wire (1
mm 2 ) for power-supply connec-
tions up to 10 m away from the
master or router. If the wire
length is less than 3 m, 22
gauge (AWG) wire (0.4 mm 2 ) is
acceptable. Do not daisy-chain
Daisy
Chain
X
the power supply connections
between different peripheral
cards, but use a star configura-
Star
tion from the master or router
when there are several periph-
eral cards.
Figure 37. Daisy Chain vs. Star Configurations
It is best to use a type of cable where the wires for the ground and positive(s) of any power
supply are bound together or twisted, and ideally the power-supply wires should not be bun-
dled with other wires.
Large transient currents flow in the ground and positive supply wires when the relay output
drivers are switched on/off, and it is imperative that any ground differential resulting from
resistive or inductive loss in the ground wire be kept as low as possible (<4 V). Use the
GND pin on header J7 on the Relay Card if you have separate power supplies. Rabbit
Semiconductor also recommends that you have a physical ground connection between the
Relay Card and the master, which you will have if the power to header J7 on the Relay
Card already comes from the master.
User ’s Manual
107
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