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FS-250 Installation and Operation Manual
Serial Interface Circuit
The serial interface circuit can address up to 16 standard annunciators and/or 8 remote processors to drive graphic annunciation or relay modules. Devices on the circuit may be connected up to 4000 feet from the control panel. At the top of the main board, the terminal blocks are used for the connection of remote serial devices.
Serial Interface Circuit,
(=, -) 24VDC nominal, 0.4 max
(X+, X-) RS-485 levels
Wire Type-Twisted Pair For Data
Wire Resistance-11 ohms/line (4000’ max)
Supervised, Power Limited,
See Owner’s Manual for
Compatible Devices.
• Remote Device Power - When connecting devices on the serial interface circuit, a limited amount of current is available from the control panel. If more current supply is required for the connected devices, auxiliary power must be provided to each insufficiently powered device. Each address on the circuit must be fully powered from either control panel or auxiliary power (no combined source can be configured).
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