SG-211 User’s Manual
© 2004 SGC Inc. Page 38
4.4 The Relay Driver Matrix
Page one of the schematic diagram shows the matrix used
to drive the relay coils. The latching relays have two
coils; one for turn-on and one for turn-off. With 16 relays,
the circuit needs to drive 32 coils. A matrix of six
columns and six rows allows selection of 36 coils with
only 12 microprocessor outputs.
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