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+
+ +-------------------+
+ | |
+ +----)------------+ |
+ | | | |
+ | +-------+ | | +---------+----o Digital output
+ | | | | | | |
++24V ac o---\/\/\/\/--+ | __ __ __ __ |
+ 10K | | | | | | | | | | |
+ | | +--------------------------+ |
+ | | | | +--|(+)\ | | \
+ Voltage | | | | | >---+ / / Pull-up resistor
+ Divider | | | +--------|(-)/ | \ ~10K
+ | | | \ /
+ | | | Comparator (NS M8830) | \
+ | | +--------------------------+ |
+ | | |__| |__| |__| |__| |
+-24V ac o-+-\/\/\/\/--+ | | |
+ | 1K | +---------+----o Digital +5V
+ | |
+ +---------------+----------------------------------------o Digital ground