AVCOMM Safety Products
Installation Instructions: S C500 EasyLink Intercom Page 1 of 4
Description: AVCOMM SC500 EasyLink Intercom is designed to provide powerful, clear communications for up to 6
positions while providing compatibility with all major brands of Fire/Safety headsets. It features rugged construction to
withstand the extreme conditions common to FIRE/EMS vehicles, a solid extruded aluminum framework to dramatically
reduce radio frequency interference (RFI), Thermoplastic Elastomer gaskets to seal out moisture and dust for trouble-free
performance and a streamlined circuit board with ceramic hybrid IC chips for high reliability. A complete line of AVCOMM
EasyLink jack boxes are available to customize your application.
Streamlined installation: AVCOMM SC500 EasyLink intercom is pre-wired and pre-assembled to dramatically reduce
tedious soldering of individual connectors. Installation is completed in four easy steps: (1) mount the intercom U-bracket, (2)
mount the headset and remote PTT jack boxes, (3) complete wiring connections, and (4) connect power source and chassis
ground.
1. Mount the U-bracket
: Select a flat location with good support that is easy for the user to access and has sufficient room
in the back for intercom cables to be connected and on the sides to install the intercom mounting thumbscrews. Mount the
U-bracket (d) using the self-tapping screws (c). Check to make sure the U-bracket is not deformed by tightening the
screws. The intercom should not be mounted with the thumbscrews until after the final checkout has been accomplished.
SC500 Intercom Hardware
a (4) PN#W161K-N Thumb screw assembly
b (4) PN#W080N-W Nylatron washer
c (4) PN#W080M-S Self-tapping screw
d (1) PN#XX150-00 U-bracket
e (1) PN#W080F-S 2-AMP fuse (Fig. 2a)
Fig. 1
Note: Make sure the nylatron
washers (b) are installed between
the intercom and U-bracket (d)
a
VOL
b
SC50
0
d
a
a
b
c
d
b
AVCOMM Safety Products
Installation Instructions: S C500 EasyLink Intercom Page 2 of 4
2. Mount the headset and remote PTT jack boxes: Select a location that has good support and is easy to access. Before
mounting the jack boxes, check cable length to make sure it is sufficient to connect to the intercom. Adjust jack box
location or use a longer interface cable if necessary. Mount the jack boxes using the four self-tapping screws provided
(Fig. 2b). When mounting jack boxes on metal plates 1/16” or thicker, drill 2.3 mm (0.091”) diameter holes for the self-
tapping screws. Most of the jack boxes have In and Out ports for daisy-chain installation. For example, a remote PTT or
Pump panel jack box does not have to be connected to the intercom back panel. It could be connected to the output of the
Driver or Co-Driver headset jack box to save additional interface cables. Fig. 2a illustrates a general connection scenario.
Radio
Jack box Interface cables
PN#I0441 ~ I0444 (5 ~ 20 ft)
Radio Interface cables
(contact AVCOMM dealer for part number)
Headset and Remote PTT jack boxes
(Driver, Co-driver)
PN# I0500, I0501, I0515, I0600, I0601
Fig. 2b
Fig. 2a
Fig. 3 Connector Pin-out Chart
Driver headsets Co-driver headsets Crew Radio
Pin 1 GND GND GND GND
Pin 2 PTT PTT MIC Crew 1 PTT
Pin 3 MIC + MIC + MIC Crew 2 MIC +
Pin 4 N/C N/C MIC Crew 3 SPK +
Pin 5 SPK + SPK + SPK + SPK -
Pin 6 N/C N/C MIC Crew 4
T
o + 12V D.C. source (Battery)
T
o Battery negative
Red: Positive
e A spare fuse included
2 Amp Fast blow
PN#: W080F-S
Connect GND to the chassis
of vehicle using 18 AWG wire
1
2
4
3
5
3
1
2
4
5
6
6-pin connector
5-pin connector
Pin-out Configuration
(back of intercom view)
Driver Co-driver
Crew
Pump panel jack box
PN# I0505
Headsets jack boxes: Crew
PN# I0500, I0530, I0535, I0540,
I0600, I0635, I0640
Black: Negative
AVCOMM Safety Products
Installation Instructions: S C500 EasyLink Intercom Page 3 of 4
INSTALLATION CHECKLIST
!
Prepare installation site
! Complete harness and wiring
connections
! Install optional accessories
! Test intercom functions before
permanent mounting
! Make adjustments if needed
! Finish permanent installation
! Re-test all intercom functions
! Have installation signed off by a
licensed communication
technician
3. Wiring connections
a. Headset & Remote PTT Jack Boxes: Route the wires carefully so that the connectors and wire insulation are not
damaged by sharp or rough surfaces. Be careful not to install the cables backwards and make sure the connector
gender on the cable is in the appropriate location for connectors on the intercom, headset, and PTT boxes. Be sure
to leave enough cable length behind the intercom so it can be mounted easily.
b. Radio: One radio can be connected to the intercom. Please refer to the ‘Mobile Radio Adaptors for Intercoms and
Car Harnesses’ chart or contact your local AVCOMM dealer for the radio interface cable for your installation.
4. Connect power source and chassis ground
a. Power: The intercom is designed for 12V D.C. negative ground systems. Connect the red and black power wires
to a noise clean vehicle power source: the black wire directly to the negative terminal of the battery (recommended),
the red wire to the positive (Fig. 2a). A spare fuse (2 AMP fast blow) is included for emergency backup (Fig. 2a~e).
b. GND wire connection: Connect GND wire to vehicle chassis (Fig. 2a).
Final Checkout and Adjustment
1. Pre-set intercom controls:
Squelch – Full clockwise position
Volume – OFF (full counter-clockwise position)
2. Test Intercom: Turn on the intercom by rotating the volume knob clockwise
(50% rotation). A green light will appear at PWR/XMT LED.
3. Test headset function: First test the driver’s headset station. The intercom
should be operating with the squelch in the Open mic mode, at fully
clockwise position. As you speak you should be able to hear your voice in
the headset as side tone. Repeat this procedure for co-driver, pump panel and
crew positions by plugging the headset into their respective jacks.
4. Test squelch: Connect the headset to the driver jack. Position the
microphone no more than 1/8” from lips at the corner of the mouth (this is
critical to the performance of the noise-canceling electret microphone). Turn
the squelch knob counter-clockwise until the microphone stops picking up
background noise, then speak into the microphone. This should break the
squelch and your voice then can be heard through the headset.
5. Test radio connection: Vehicle radio reception should be heard in all headsets regardless of the squelch setting. The
volume of radio reception should be adjusted at the radio. Starting with the driver headset, test the radio transmission by
pressing the PTT for the radio and perform a radio check. The green LED will turn to yellow when the PTT is pressed
and the radio is transmitting. Repeat this test for the co-driver and pump-panel headsets.
6. Mount intercom: After all connections have been checked, slide the intercom into position. Assemble and tighten the
thumbscrews (a) and Nylatron washers (b) as illustrated in Fig. 1
GENERAL SPECIFICATION TABLE
ELECTRICAL CONTROL/FEATURES MECHANICAL
Intercom: Monaural
Headphone impedance: 150-1000
Ω typical
Audio output power: 250 mW
Audio distortion: <10% @ 85 mW into 150 Ω load
Mic input source impedance: 680 ohms
Mic input source voltage: 8 ~ 9.6 V typical
3 dB Mic frequency response: 300 Hz-3000 Hz
Voltage supply: 12 ~ 28V DC
Current consumption: 33 mA typical w/2 headsets
Max current consumption: < 90 mA
Radio connections: single
Voice activated (VOX)
Volume control
Squelch control
Power transmit LED with ‘stuck mic’ indicator
Co-driver priority PTT
Number of positions: 2 – 6 places
EasyLink™ installation
Extruded aluminum construction
Thermoplastic Elastomer gaskets
Pre-wired for optional crews jacks
Dimensions: 4.96” L x 2.69” W x 1.19” H
Weight: 8.7 oz.
AVCOMM Safety Products
Installation Instructions: S C500 EasyLink Intercom Page 4 of 4
Mobile Radio Adaptors for Intercoms and Car Harnesses
AVCOMM Intercoms: AR550, AR560R, SC100, SC500, SC550, SC800, SC810R
Brand
Model Part #
ADI All Models
P0471V2
ICOM IC-111, 121, 211, 221, V8000 IC2100, IC2800
P0486V2
Johnson Challenger Plus
P0477V2
Kenwood TK750
P0476V2
Kenwood
TK730, TK760, TK760H (requires adaptor), TK762, TK780, TK830, TK860,
TK862, TK880, TK980, TK981, TK6110
P0482V2
Kenwood TK690, TK790, TK890
P0483V2
Kenwood TM-261A
P0490V2
Maxon/Midland ML3245
P0488V2
Maxon SM4150, GE Monogram
P0472V2
Motorola CDM 1250, Maxtrac 16 pin, GM300, M120, M216, M1225
P0484V2
Motorola MCS2000
P0485V2
Motorola
XTL5000 – Coming Soon!
Coming soon
Nu-Tech Roadmaster 4 pin
P0469V2
Nu-Tech Roadmaster 5 pin
P0468V2
Standard/Horizon GX2350S, 2355, 1270, 1265, 1260, 1255, 1250
Custom
Tekk MT-800
P0493V2
Vertex VX2000, VX3000
P0470V2
Vertex VX2500, VX3200
P0487V2
Vertex VX4000
P0481V2
Vertex Universal un-terminated
P0473V2
Yaesu FT1500M, FT2600M, FT2800M
P0492V2
Note: Some cables may require an adaptor from the radio manufacturer.
Note: Custom cables may require customer to supply hand mic cable.
/
