1-99
Installation 15088: J 10/22/99
Fire Alarm and Trouble Signal Transmission
The application provided in Figure 6.4-2 is not suitable for separate transmission of sprinkler supervisory
signals. All circuits are supervised and power limited. 18 AWG (0.75 mm²) is the minimum. There is a
maximum loop resistance of 40 ohms for the LIB-200, and 50 ohms for the LIB-200A and LIB-400. The
maximum distance between the Central Station/Receiving Unit and the MMXs is 10,000 feet (3048 meters)
at 12 AWG (3.25 mm²) for the LIB-200 and 12,500 feet (3841 meters) at 12 AWG (3.25 mm²) for the LIB-
200A and LIB-400. For initiating device connections, refer to Figures 4.6-2 through 4.6-6.
Figure 6.4-2 NFPA 72 Proprietary and Central Station Protected Premises
Unit/Proprietary and Central Station Receiving Unit Interface
11
10
9
P4
1
ELR R-47K
MMX-1
Programmed with the
software type ID
"MRTB"
CPU in NFPA 72 Protected
Premises Unit
Normally Closed
Trouble Contacts*
Normally Open
Fire Alarm Contacts
(contacts shown in their
normal state)
MMX-101
Programmed with the
software type ID
"MON"
LIB-400 in NFPA 72 Proprietary and Central Station
Receiving Unit SLC Loop
Channel
( - )
( + )
NOTE
The MMX-1 and MMX-101 are
interchangeable in this example.
* Trouble contacts will transfer during any supervisory,
security alarm or other trouble condition.
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