8 LDM Series Instruction Manual — P/N 15885:H3 8/12/2019
Section 2: LDM Features
2.1 Product Overview
The LDM Series Lamp Driver Modules, which consist of the LDM-32 master and LDM-E32 expander modules, are used to provide an
interface to a custom graphic annunciator. The master module provides power and control for a maximum of three expander modules.
The LDM-32 and LDM-E32 have output connectors which are used to drive lamps or LEDs and input connectors which are used for
remote switch functions.
The LDM Series Lamp Driver Modules may be connected to fire alarm control panels (FACP) to provide remote annunciation of the fol-
lowing:
• General system status:
– General Alarm
– General Trouble
– General supervisory
– Notification Appliance Circuit (NAC) output status
– Municipal tie status
– System silence
– Alarm relay status
• Alarm and trouble status of zones or individual points
• Alarm only status of zones or individual points
The LDM Series Modules also interface to remote control switches which may be used to provide:
• System reset
• System silence
• System acknowledge
• Temporary activation of NAC outputs
• Alarm relay activation
• Other control functions
The LDM Series Modules interface to the host fire alarm control panel via an EIA-485 communications bus circuit. A maximum of 32
LDM-32s may be connected to the power-limited EIA-485 bus, but if other types of devices are also connected to the EIA-485 bus, the
maximum number of LDM-32s must be reduced by the total of such devices. The EIA-485 wiring distance must not exceed 6,000 feet
(1,800 m) and cannot be T-tapped. Multiple LDM-32s may be used to annunciate duplicate information.
Power to the LDM-32s is typically provided by the host FACP and must be power-limited regulated 24 VDC. External UL listed battery
backed power supplies may also be used. Careful consideration must be given to system battery calculations when power for the LDM
modules and lamps or LEDs is provided by the host FACP. Refer to the specifications in the appropriate FACP technical manual when
making these calculations.
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