Installation Instructions

Siemens Building Technologies, Inc.
8 Fernwood Road
Florham Park, New Jersey 07932
P/N 315-447344-3 PAGE 1 OF 4
INSTALLATION INSTRUCTIONS AND WIRING FOR
CAT. NO. SRU-2 SERIAL RELAY UNIT
AND
CAT. NO. SRE-8 SERIAL RELAY EXTENDER
The SRU-2 Serial Relay Unit is an optional accessory for the MPC-6000 and MPC-7000 Fire Alarm
System Control Unit. The SRU-2 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.
SRU-2 PARTS SUPPLIED
1 557-413829 Processor Board Assembly
1 557-413321 Relay Board Assembly
1 555-446653 34 pin Cable Assembly, 3 1/2”
1 195-447042 PCB Track, 14 1/2”
1 555-447080 10 pin Cable Assembly, 6”
1 235-443269 Screwdriver
3 899-G67197 Keps Nut, #6-32
1 315-447344 Instruction Sheet
SRE-8 PARTS SUPPLIED
1 557-413321 Relay Board Assembly
1 555-446652 34 pin Cable Assembly, 15”
1 555-446653 34 pin Cable Assembly, 3 1/2”
1 195-447042 PCB Track, 14 1/2”
3 899-G67197 Keps Nut, #6-32
1 315-447344 Instruction Sheet
SRU-2 DIMENSIONS
SRE-8 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 such as the FAE-21 Fire
Alarm Accessory Enclosure (P/N 500-
401403014FA), as required.
Step 4.) Attach conduit and run wires as required in a dry,
protected environment.
Step 5.) Set processor board dip switch (SW-1) for proper
remote address (See SRU-2 Address Setting).
Step 6.) Set each relay board dip switch (S1) for proper
relay set number on the relay board (SRE-8).
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 signal of P2 follows the sounder on the panel.
Step 8.) Mount PCB Track(s) using #6-32 keps nuts (P/N
899-G67197) 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) (P/N 899-G67197).
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.