Controlling Sounder On/Off Over Two Wires Using Module Horn Control
• Connect the current source to the horn control input. If a zone output is used for the source, you must use an EOL
on the horn control input terminal.
• When multiple modules are used, the horn control circuits can be wired in parallel. If wired in parallel and a zone
output is used from panel, use an EOL on the last module for supervision.
This input powers the MDL Module. This input must have voltage present from the
ZONE 1 INPUT
FACP before anything will work. This also supplies voltage to Zone 1 output.
This input only supplies voltage to Zone 2 output. NOTE: If Zone 1 input is not
ZONE 2 INPUT
powered, the notification devices attached to the Zone 2 output will not be allowed.
This input enables the horns on the SpectrAlert notification appliances. Voltage
HORN CONTROL
present means horns are enabled. No voltage present means horns are disabled.
SLAVE IN Connects to Master MDL Module slave out.
SLAVE OUT Connects to Slave MDL slave in.
NOTES:
Horns Silenced Over Two-Wire Circuit
1) Any mix of SpectrAlert horn/strobe, strobe-
1) Any mix of SpectrAlert horns/strobes or strobe-only devices is
only, or horn-only devices is allowable for
Zone 1.
acceptable.
2) Horn Control connects to interruptible power source.
2) No devices or horn-only are allowed on Zone
2. If no devices are installed on Zone 2,
terminate EOL resistor at horn control
terminal.
MDL and MDLW Sync Modules CS-2456 10/21/04
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