Serial Interface Circuit - Siemens FC901-U3 Installation, Operation And Maintenance Manual

Serial Interface Circuit (UFP)
The serial interface circuit can address up to 8 devices, which include annunciators and printer
modules. Up to 2 printers can be addressed. Devices on the circuit may be connected up to
4000 feet from the control panel.
Serial Interface Circuit (UFP)
(PR_A, PR_B) RS-485 levels
Wire Type-Twisted Pair For Data
EARTH – shielding earth connection
Wire Resistance-50 ohms/line (4000' max)
Supervised, Power Limited.
Serial interface circuit (UFP)
Remote Device Power – The on-board auxiliary power can provide power for ONLY one
annunciator. If more power is required for the connected devices, external power must be
provided. Each address on the circuit must be fully powered from either auxiliary power of
control panel or external power.
: If the annunicator is connected to a Separated Power Supply, the separate power
supply needs to be UL Listed for Fire Safety Use and Power Limited.
GND1
PR_A
PR_B
EARTH
GND1
SE_A
SE_B
EARTH
39
Primary part
(X5)
Secondary part
(X6)