FS20 Marine Fire Detection Control Pan
el
Siemens Industry, Inc. A6V10519176_enUS_b
Building Technologies Division
• All local network wiring is rated Power Limited and should be wired in accordance with applicable
codes.
• The local network utilized a modified RS-485. It is not presently compatible with modem
transmission.
6. Global Network Circuits (i.e., FS20 Fire to FS20 Fire)
• Minimum wire size is 18 AWG, maximum is 14 AWG.
• The maximum allowable:
o Line resistance is 80 ohm (both wires)
o Line capacitance is 0.33 UF Line to Line and 0.66 UF Line to Ground for each network
pair.
o These parameters also apply to the Foreign System Interface module; (RS-485).
• Parallel wiring (T-tapping) is not allowable.
• 120 ohm, ¼ watt resistors must be placed at each end of the network pair.
• All network wiring is rated Power Limited and should be wired in accordance with applicable codes.
7. Multiple network utilized a modified RS-485 .
8. All NAC circuits must use a minimum 14 AWG
• Max Line resistance (all wires) is three ohms.
o Line capacitance is 0.05 UF Line to Line and 0.1 UF Line to Ground.
• These circuits and their associated wiring are rated Power Limited and should be wired in
accordance with applicable codes.
• Parallel wiring (T-tapping) is not allowed on any NAC circuit.
• When programmed for leased line circuits, the external wiring resistance to the monitoring
location must be between 2K and 5K ohms. This line must be a dedicated pair for fire-alarm use
only.
• When programmed for municipal tie circuits, the external wiring resistance to the municipal box
shall not exceed 22.5 ohms (both wires).
o When programmed for releasing service use the maximum line resistance is three ohms
(both wires).
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