Audio Developments AD144 - Manual (Page 42)

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To operate the majority of external devices, it will be necessary to ‘close’ a circuit, but,
for some, it will be necessary to ‘open’ the control circuit. The relays are situated at
the top of the module’s printed circuit board, and associated with each one is a DIL
switch that enables it to close a circuit (normally open - N/O) or open a circuit
(normally closed - N/C). The module leaves the factory with switches in the N/O
position. When any of the pins 3-7 relays must have the same settings, ie N/O or
N/C.