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5409216-REV A 3/21
Potter Electric Signal Company, LLC • St. Louis, MO • Phone: 800-325-3936 • www.pottersignal.com
INSTALLATION MANUAL: FFT-EXP FIRE FIGHTERS TELEPHONE EXPANDER
Before connecting a device to the RS-485 connection, take the following precautions to prevent potential damage to the
RS-485 connection.
• Power to the RS-485 connection is removed.
• Field wiring on module is correctly installed.
• Field wiring has no open or short circuits.
3. TECHNICAL SPECIFICATIONS
Standby Current
56 mA
Alarm Current
116 mA
FFT-EXP Voltage
24VDC
Operating Temperature Range
32° to 120° F (0° to 49°C)
Operating Humidity Range
10% to 93% (non-condensing)
4. INSTALLATION
The FFT-EXP connects to the FFT-1000 using the F-Link and Voice terminals to establish communication. The connec-
tions are power limited and supervised. Each board is equipped with stacker bracket for secure and accessible mounting.
The FFT-EXP must be installed within 20 feet of the FFT-1000 and the wiring must run through conduit.
FIGuRE 3. FFT-EXP MODuLE