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INSTALLATION INSTRUCTIONS
Model FS-RU2 Serial Relay Unit
Model FS-RE8 Serial Relay Extender
The FS-RU2 Serial Relay Unit is an optional accessory for the FS-250 and FS-250C Fire Alarm System
Control Panels. The FS-RU2 includes a processor board and a relay board. The processor board receives
commands from the control unit for activating the relays and transmits supervision and control functions to
the control unit. The processor board can control up to 3 relay boards. Each relay board provides 8 relays
with Form C contacts. The control unit can address up to 8 Serial Relay Units and/or Serial Annunciator
Units. Auxiliary power supplies will be required to power units beyond the control unit capability.
FS-RU2 PARTS SUPPLIED
1 Processor Board Assembly
1 Relay Board Assembly
1 34 pin Cable Assembly, 3 1/2”
1 PCB Track, 14 1/2”
1 10 pin Cable Assembly, 6”
1 Screwdriver
3 Keps Nut, #6-32
1 Instruction Sheet
FS-RE8 PARTS SUPPLIED
1 Relay Board Assembly
1 34 pin Cable Assembly, 15”
1 34 pin Cable Assembly, 3 1/2”
1 PCB Track, 14 1/2”
3 Keps Nut, #6-32
1 Instruction Sheet
SW-1
P6
S1
FS-RU2 DIMENSIONS
S1
FS-RE8 DIMENSIONS
Siemens Industry, Inc. Siemens Building Technologies, Ltd.
Building Technologies Division Fire Safety & Security Products
Florham Park, NJ 2 Kenview Boulevard
Brampton, Ontario L6T 5E4 Canada
Step 1.) Installation is to be done by qualified personnel
Step 2.) Disconnect BATTERY and AC prior to working on
Step 3.) Mount enclosure that is UL Listed for Fire
Step 4.) Attach conduit and run wires as required in a dry
Step 5.) Set processor board dip switch (SW1) for proper
Step 6.) Set each relay board dip switch (S1) for proper
NOTE: Relays are numbered from left to right:
Step 7.) Set jumper P6 for desired buzzer operation.
P6 – BUZZER ACTIVATION
NOTE: When “Local” is selected, the buzzer follows the sounder
Step 8.) Mount PCB Track(s) using #6-32 keps nuts and
Step 9. Plug in the cable assembly(s) to the PCB
Step 10. Connect ground wire(s) to chassis ground using
Step 11.) Connect IN wires from fire alarm system control
Step 12.) Connect OUT wires to next remote or 120 ohm
who have thoroughly read and understood this
instruction sheet.
equipment.
Protective Signaling Use as required in a dry
protected environment.
protected environment.
remote address (See FS-RU Address Setting).
relay set number on the relay board (FS-RE8).
Relay Set TB1 TB2 TB3 TB4
(1-8) 1 2 3 4 5 6 7 8
(9-16) 9 10 11 12 13 14 15 16
(17-24) 17 18 19 20 21 22 23 24
• REMOTE
•
• LOCAL (Processor Board Buzzer)
on the panel. When “Remote” is selected, the local
buzzer does not activate, but the “Remote Buzzer Output”
pin of P2 follows the sounder on the panel.
snap in PCB assemblies.
assemblies as required.
#6-32 keps nut(s).
unit or previous remote as required.
E.O.L. Resistor Assembly (P/N 140-050008-1), if
last remote.
P/N 315-049308-6 (v12-14-09)
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Step 13.) Connect relay contacts, as required.
A
A
Step 14.) Apply power to system.
Step 15.) Program control unit for required relay operation.
Step 16.) Check for proper operation of functions.
FS-RU2 / FS-RE8 WIRING
Power Limited, Supervised
Cable for power (+ & -) and Twisted
pair Cable for data (X+ & X-) from
panel or previous remote.
Cable for power (+ & -) and twisted
pair Cable for data (X+ & X-) to next
remote or 120 ohm E.O.L. Resistor
ssembly (P/N 140-050008-1) on the
last remote.
TB3 allows for connection to an
external regulated and power limited
24VDC power supply, listed for fire
protective signaling use.
Notes:
1.) Units to be installed in accordance with all local codes.
2.) T-Tapping is not allowed! Communication wiring must be daisy chained from unit to unit.
3.) Terminal block will accept 12 AWG to 18 AWG wiring.
4.) Use twisted pair cable with a characteristic impedance of approximately 120 ohms. 4000 feet maximum distance from
end to end.
5.) Power Limited wiring must be kept separate from non-power limited wiring, ¼ “ minimum.
6.) All wiring to P2 on the remote processor board must be in the same enclosure.
7.) The following table gives the currents necessary for power supply and battery calculations.
Model Standby Current Alarm Current Voltage
FS-RU2 0.032 A 0.192 A (All relays activated) 24VDC nominal, filtered
FS-RE8 0.000 A 0.170 A (All relays activated) 24VDC nominal, filtered
Programmable Relay Contacts
(Shown in normal standby condition)
1A@28VDC max., Resistive
For Power Limited Source, Unsupervised
= Common (Armature)
C = Normally Closed
O = Normally Open
FS-RU2 ADDRESS SETTING
SW-1
OFF ON
1
2
3
4
Address Switch 1 Switch 2 Switch 3 Switch 4
1 On On On Off
2 Off On On Off
3 On Off On Off
4 Off Off On Off
5 On On Off Off
6 Off On Off Off
7 On Off Off Off
8 Off Off Off Off
PROCESSOR BOARD HEADER CONNECTIONS
Pin P2 - Processor Board
1 24V Output (+)
2 Not Used
3 Lamp Test Switch
4 Alarm Silence Switch
5 Trouble Acknowledge/Silence Switch
6 System Reset Switch
7 Remote Buzzer Output (open collector)
8 Alarm Silence Output (open collector)
9 Trouble Output (open collector)
10 24V Output (-) or GND
P/N 315-049308-6
2
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The P2 connector on the processor board assembly of the FS-RU2 allows the unit to be connected to an annuniator
to display system status and ancillary control of the panel.
NOTE: If used for ancillary control of the panel, it must be located in a locked enclosure.
POWER OUTPUTS:
P2-1: 24VDC (+)
P2-10: GND
Rating:
24VDC nominal, filtered
0.200A max.
SWITCH INPUTS:
These inputs are momentarily connected to GND using a toggle switch to activate. These inputs are not supervised.
All switch input wiring must be in the same room as the FS-RU2.
Typical wiring connection:
P2-3: Lamp Test Switch – when activated, all local LEDs activate for 4 seconds, then LEDs revert back to
previous state.
P2-4: Alarm Silence Switch – when activated during an alarm condition, silences the NACs. Once the NACs are
silenced, pressing this switch again does not unsilence the NACs.
P2-5: Acknowledge Switch – if events are present when activated, acknowledges the event and silences the
local buzzer.
P2-6: System Reset Switch – when activated, initiates a panel system reset.
OPEN COLLECTOR OUTPUTS:
If LEDs are connected to these outputs, use the proper resistor value (typically 2.4K ohms) to limit the current flowing
through the LEDs.
Rating:
24VDC nominal, filtered
0.070A max. per circuit
Typical wiring connection:
P2-7: Remote Buzzer Output – when “Remote” is selected in P6, this output follows the buzzer activation on the
panel.
P2-8: Alarm Silence Output – this output activates to indicate that the NACs are silenced.
P2-9: Trouble Output – this output activates when a trouble event is detected by the system.
P/N 315-049308-6
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P/N 315-049308-6
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