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LDM Series Instruction Manual —
P/N 15885:H3 8/12/2019
LDM Features
The LDM-E32
2.3 The LDM-E32
Each LDM-E32 expander module provides 32 additional lamp/LED driver outputs from J5, J6, J7 and J8. The expander module has a
slide switch SW4 for selecting alarm or alarm and trouble annunciation and an input for a local lamp test switch. In alarm mode, use only
one LDM-32 and one LDM-E32 for a maximum of 56 alarm indicators and 8 system status indicators. In alarm/trouble mode, use one
LDM-32 and three LDM-E32s for a maximum of 56 alarm indicators, 56 trouble indicators, 16 status indicators and 64 optional control
switch inputs. Multiple sets of LDM-32s with LDM-E32 expanders increase the system annunciation capabilities beyond 56 zones or
points. This is possible by various settings of address switches SW1 and SW2 on the LDM-32 (refer to the appendix for the appropriate
FACP). Each LDM-E32 is supplied with a 26 conductor expander ribbon cable, 4 standoffs and 4 screws.
2.4 Connectors on the LDM-32 and LDM-E32
J1 - Switch Matrix
Up to 16 optional external control switches and a local lamp test switch may be attached to the LDM-32 and LDM-
E32 via J1 as shown in Figure 4.10. To determine which switch function each point will perform in a specific FACP (Fire Alarm Control
Panel), refer to the appropriate Appendix for your FACP. Switch functions on intelligent panels such as NFS2-3030, AM2020/AFP1010,
etc. are completely programmable.
J2 - Ribbon Cable Connection Between Master and Expander Modules to J3
A single 26 conductor ribbon cable may be connected
from J2 on the LDM-32 or LDM-E32 (see Figure 3.3) to J3 on adjacent LDM-E32s. The ribbon cable carries power, ground and signal-
ing from the LDM-32 to up to three LDM-E32s. The preformed cables are supplied in fixed lengths of 24 and 48 inches.
J3 - Ribbon Cable Connection From J2
This connector supports a single 26 conductor ribbon cable from J2 of the previous LDM-32
or LDM-E32. Refer to Figure 3.3.
J4 - Keyswitch Input
This two pin connector is provided as an input on LDM-32 and LDM-E32 modules for an external security key-
switch. Keyswitch contacts must be Normally Closed. The keyswitch prevents unauthorized use of remote control switches wired to J1.
J5, J6, J7 and J8 - Lamp/LED Driver Outputs
Each connector provides 8 driver outputs for a total of 32 drivers on each LDM-32 and
LDM-E32. Each driver is rated for a maximum of 30 volts and a current of 100 mA and is programmable. Each bipolar Darlington open
collector driver output must be current limited by an external resistor. 8-Point Shift and Flash functions are selectable by DIP switch
SW3 (refer to Section 2.5, “Switches”). Lamp/LEDs may function in 'alarm only mode' or 'alarm/trouble mode' as selected by switch
SW4. Use the charts and examples shown in the appendix for your FACP for additional information.
J9 - Lamp Power/System Trouble
Connector J9 is located only on the LDM-32. J9 pin 1 provides 24 volts regulated power to all
lamps/LEDs used in a custom graphic annunciator. The current limit of J9 pin 1 is dependent upon the current limits of the external
power source being used. J9 pin 3 is a driver output for system trouble indication only. J9 pin 2 connects to system common.
J10 - Relay Expander
Cables to the optional LDM-R32 Relay Expander Module which can be used to provide up to 32 dry Form-A
(normally open) contacts.
J6
J5
J4
J1
SW4
SWITCH
MATRIX
OUTPUTS
J7
J8
J10
J2
Output Connectors for
Wiring to LEDs
Security Key
Switch Terminal
Terminal for max.
of 16 external
control switches
Alarm Only or
Alarm/Trouble
Select Switch
On-line LED:
Flickers to
indicate EIA-485
Communication
Active
Ribbon Cable
Connection to
next LDM-E32
Relay Power
Ribbon Cable
Connection
LD
M-E
32
f.
w
mf
Figure 2.2 LDM-E32