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5–7
Fig. 45. Input configuration during a maintenance session. By default, alarm/control
inputs are configured as NO.
Inputs to a Multi-Media unit, used by hardware devices
Installers should report if input devices are using connections that are: normally open,
normally closed or end-of-line.
5.6.1 Input: Technical Notes
NO: normally open
The sensor inputs to a Multi video unit are configured for normally open (NO devices;
see figure 46).
NC: normally closed
Most alarm sensor units have a dry contact for outputs, usually providing NO contacts or
NC contacts (see figure 46).
EOL: end of line
A sensor input can also be configured as EOL (end-of-line or protected).
A
B
C
Fig. 46. Schematics: (a) normally open, (b) normally closed or (c) end-of-line