Edwards Signaling eFSA250 - Manual (Page 23)

Chapter 1: Installation and wiring
E-FSA64 and E-FSA250 Technical Reference Manual 11
Addressable device loop wiring
The eFSA64 and eFSA250 control panels each have one addressable device
circuit that you can use with addressable detectors and modules. The eFSA64
supports up to 64 devices. The eFSA250 supports up to 127 addressable
devices on the initial loop and an additional 127 devices on the optional second
loop. The loop circuit is supervised for open circuits, short circuits, and ground
faults.
Note: For a complete list of devices that can be connected to this circuit, refer to
the eFSA64 and eFSA250 Series Compatibility List (P/N 3101199).
Caution: The E-2WIRE module cannot be used on a device loop with isolator
modules or isolator bases.
Circuit specifications
• Class B or Class A
• Communication line voltage: Maximum 20.6 V peak-to-peak
• Circuit current: 0.5 A max.
• Total resistance: 66 Ω max.
• Total capacitance: 0.7 µF max.
• Resistance between isolators: Limited only by overall wire run lengths
• Isolators: 64 maximum (total both isolator bases and modules)
• Ground fault impedance: 0 to 5 kΩ
• Power-limited and supervised
• Synchronization: Signal synchronization is supported on a system-wide basis
(all device loops) when using an E-NAC addressable notification appliance
circuit (NAC) module and Genesis or Enhanced Integrity notification
appliances
Installation limits are subject to acceptance by the AHJ.