Siemens FS-RU2, Installation Instructions & User Manual

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 

P/N 315-049308-6  (v12-14-09) 

 
 
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 

P6 SW-1

S1

FS-RU2 DIMENSIONS 

S1

FS-RE8 DIMENSIONS

Step 1.)  Installation is to be done by qualified personnel 

who have thoroughly read and understood this 
instruction sheet. 

Step 2.)  Disconnect BATTERY and AC prior to working on 

equipment. 

Step 

3.)  Mount enclosure that is UL Listed for Fire 

Protective Signaling Use as required in a dry 
protected environment. 

Step 4.)  Attach conduit and run wires as required in a dry 

protected environment. 

Step 5.)  Set processor board dip switch (SW1) for proper 

remote address (See FS-RU Address Setting). 

Step 6.)  Set each relay board dip switch (S1) for proper 

relay set number on the relay board (FS-RE8). 

    NOTE:  Relays are numbered from left to right: 

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 

Step 7.)  Set jumper P6 for desired buzzer operation. 

P6 – BUZZER ACTIVATION 

•

 REMOTE 

•

•

LOCAL  (Processor Board Buzzer) 

 
    NOTE:  When “Local” is selected, the buzzer follows the sounder 

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. 

Step 8.)  Mount PCB Track(s) using #6-32 keps nuts and 

snap in PCB assemblies. 

Step 

9.  Plug in the cable assembly(s) to the PCB 

assemblies as required. 

Step 10.  Connect ground wire(s) to chassis ground using 

#6-32 keps nut(s). 

Step 11.) Connect IN wires from fire alarm system control 

unit or previous remote as required. 

Step 12.) Connect OUT wires to next remote or 120 ohm 

E.O.L. Resistor Assembly (P/N 140-050008-1), if 
last remote.