Specifications

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.

• 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).

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.

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