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The multiplexing arrangement permits 256 zone switches to be multiplexed into the system so as to provide a large input capability with minimum hardware.
English (United States)
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Multiplexing Monitor and Line Surveillance in a Control Access System
The multiplexing arrangement permits 256 zone switches to be multiplexed
into the system so as to provide a large input capability with minimum hardware.
The system utilizes a 32 point D/I - D/O card (data input and output). The 32
D/O's are split in half. Bits 0 through 15 are utilized as the "X" coordinate of the
multiplexer, and bits 16 through 31 are utilized as the "Y" coordinate, as shown in
Only half of the D/O's are conditioned at any time so as to sense what
contact "X" to "Y" coordinate is made. When a contact is closed, it will connect
that "X" or "Y" coordinate, depending on whether "X" or "Y" is programmed, to
the corresponding "X" or 'X" coordinate. For example, if the bit 0 coordinate and
bit 16 coordinate switch is closed, then bit 16 shows up when 0 through 15 are
programmed, and bit 0 shows up when bits 16 through 31 are programmed.
Each time one half of the D/I points are programmed, a complete scan is
required for the 32 D/O points.
This multiplexing technique provides for automatic line supervision,
multiplexing without using OEM (outside equipment manufacturer) multiplexer
hardware or equivalent, and minimizing programming time per point.
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