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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
bundled with other wires.
Large transient currents flow in the ground and positive supply wires when the digital 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 J1, J4, or J9 on the Digital I/O Card if you have separate power sup-
plies. Rabbit Semiconductor also recommends that you have a physical ground connection
between the Digital I/O Card and the master, which you will have if the power to header
J9 on the Digital I/O Card already comes from the master.
For development purposes, it is possible to draw the +K1/+K2 power from DCIN, as long
as you are careful to use only one digital output at a time to avoid exceeding the maximum
current-output capability of the DCIN supply. You can use a 3-way or a 4-way splice (for
example, Molex Series 19204), connector shells, or a terminal block to split the DCIN
supply from the master. Remember to do the same for the GND.
+K1
DCIN
(from master)
DCIN
+K2
Figure 7. Example of 4-way Splice for DCIN (used for development purposes only)
User ’s Manual
21
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