Section 6: Ldm Communications; Receive Only Ldm-32S; Receive/Transmit Ldm-32 - Honeywell NOTIFIER LDM Series Instruction Manual

Lamp driver module
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6.1 Receive Only LDM-32s

For duplicate annunciation of system points, LDMs can be configured for Receive Only annunciation. Receive Only LDMs must be set
to the same address as the LDM they duplicate, but are not fully supervisable. Receive Only LDMs intercept information being transmit-
ted to a Receive/Transmit LDM so that this information can be duplicated at an intermediate display location. When configured for
Receive Only operation, LDMs cannot transmit information to the host control panel. Remote Acknowledge, Silence, or Reset cannot be
performed. Control switches on Receive Only LDMs are for local lamp test only. If a Receive/Transmit LDM is located at the end of the
EIA-485 bus, it will provide supervision of Receive Only LDMs located on the EIA-485 bus between the Receive/Transmit LDM and
the FACP. See Figure 6.1.

6.2 Receive/Transmit LDM-32

LDMs that are configured to serve as full-function annunciators can both receive status information for annunciation as well as transmit
commands to the control panel through custom-wired point control switches. This allows the LDM to initiate control panel switch func-
tions from a remote location in addition to displaying the status of the system.
22

Section 6: LDM Communications

Fire Alarm Control Panel
*The EIA-485 circuit is supervised and
power-limited with a characteristic
impedance of 120 ohms.
Figure 6.1 LDM-32 Supervision
Receive only LDM-32
set to Address X
Two-wire EIA-485
Circuit*
LDM-E32
Full-Function Receive/Transmit
LDM-32 set to Address X
LDM-E32
LDM Series Instruction Manual — P/N 15885:H3 8/12/2019
LDM-32
LDM-32

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