Microsound MH04 User manual

MH04 Manual
7 August 2009 Page 1/6
Microsound - MH04
HOME INTERCOM
1. Features
Home intercommunicating intercom system
Nine handsets
Four gate stations
Only four common wires throughout
No switcher units required between door stations
2 Button door stations can call house or maid
Communication with any handset from gate station with door release
Door stations are robust surface mount with rain shield
All handsets, call function
Two handsets on one number
Conference calls
Central termination board for easy wiring & maintenance
Power supply with lightning protection and optional battery backup
Auxiliary PCB to trigger alarm panic
Interface to PA
2. Operation
Lift handset, press required number.
Called handset will ring & Led will come on momentary.
Lift handset you are communicating with calling handset.
Replace handset when finished.
If the door station calls the house, all the handsets will ring and the Led’s will flash.
Lift any handset, press “0” and you will be able to talk to the calling door station.
To open the gate press the # and replace handset.
3. Button Functions
1 - 8 Calls handsets in house
9 Calls maid or cottage
0 Calls door station
# Opens gate when called from door station
NB! Only opens gate at calling door station
*9 Calls all handsets
*1 Panic to house alarm
*2 PA interface function
*6 Enables/disables call from gate and all call
*7 Program handset number
*8 Check handset number

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4. Programming handsets
1. Switch power on, within 60 seconds dial *7 then the handset number.
2. Handset numbers can be programmed at any time by dialing 49324 then pressing *7
followed by the required handset number.
3. To exclude a handset from the door station call, dial *6 from the desired handset. The
handset Led will go off.
4. To include a handset from the door station call, dial *6 from the desired handset. The
handset Led will come on.
5. To check the handset number dial *8, the Led will flash on & off corresponding to the
intercom number.
5. Installation
1. Four common wires, two pair twisted 0,5mm telephone cable between all handsets, door
stations and termination board.
2. A core for Positive, Ground and Audio A and B
3. Between the termination board and PSU, a two core 0,5mm square cable.
4. The termination board is provided to allow each handset to be individually cabled to a
central convenient point, with a 2 Pair cable. The termination board has 6 four-way
pluggable connectors to terminate the two pair cables on. Two cables can be terminated
on one connector. No other cable joints must be made anywhere. This makes fault
finding very easy as handsets can be unplugged from the system to trace a fault.
5. The termination board has a two-way PSU connector for power, 13,8V regulated DC
from the power supply. The 2 pair twisted cable can also be used for power but then
double up on the cores, and use the Orange/White pair for Positive and the Blue/White
for Ground.
6. A two pair twisted screened Fire Alarm cable also connects from the termination board
to all the door stations 1, 2, 3 & 4. A four-way lightning protection PCB can also be
added to the cable run for lightning protection.
7. The door station must also be wired to the gate motor or door strike. A separate 12V DC
power supply is required for a door strike.
8. A potential free Relay contact with a link to select normally open or normally closed is
provided to trigger the motor gate or the door strike, on gate station PCB.
9. If a door strike is used a IN4007 diode must be connected reversed biased across the
door strike coil to block the back EMF.
10. No switchers are required between gate stations as the handsets will only communicate
with and open the gate from where the call was made. The other gate stations will be
busied out.

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Handset Connections -Two pair Twisted Telephone cable
Marking
Description
Wire Colours
+
Positive 13,8V from termination board
Orange
One Pair
-
Ground from termination board
White
A
Audio from termination board
Blue
One Pair
B
Audio from termination board
White
Door Stations Connections -Two pair Fire Alarm cable
Marking
Description
Wire Colours
+
Positive 13,8V from termination board
Red
One Pair
-
Ground from termination board
Blue
A
Audio from termination board
Yellow
One Pair
B
Audio from termination board
Slate
Power Supply Connections
Marking
Description
Wire Colours
+
Positive 13,8V from power supply
One pair Orange/White
-
Ground from power supply
One pair Blue/White
Audio Level Adjustment
The handset and door stations both have two pre-set Pots. One for TX Audio and one for RX
Audio. These Pots are pre-set at the factory and should not have to be adjusted.
P1 Adjust the TX Audio
P2 Adjust the RX Audio
6. Technical Information
Cable requirements:
A 2 pair 0,5mm twisted pair cable between all handsets, door stations and termination board.
If the cable to the door stations goes outside and could be susceptible to lightning, then it
must be a screened Fire Alarm cable.
MH04GS Gate Station:
Size: 136mm high x 101mm wide x 80/60mm deep
Mounting: Surface
Finnish: Weather proof stainless steel powder coated box. The front is anodized
aluminium.
Features: Two call button with backlit name plate
Busy Led
Relay output to trigger motor gate
Power: 13,8V DC idle current 25mA

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Handset:
Size: 180mm high, including curley cord 260mm
60mm wide
55mm deep
Mounting: Handset base is only surface wall mounting
Finnish: White ABS plastic with a black 3x4 keypad
Power: 17mA idle
Total Power: A full system with 9 handsets and 4 door stations will draw 260mA in idle
condition. The battery backup will power a full system for a period of 8 hours during a power
failure.
7. Handset Mounting Instruction
The handset base is mounted to the wall with two counter sunk screws and wall plugs.
Remove any bumps on the plaster so that the plastic back can sit flush with the wall, so it
does not distort when the screws are fastened.
First drill and mount the back with only the bottom screw. Level the back then drill the
second hole in the centre of the slot at the top. Small adjustments can then be made with the
slotted screw hole, when level tighten both screws. Both screw heads must be below the
base level so as not to short out the PCB.
The base has two cable entry points. One on the back next to the slotted screw hole and
one break-out on the top right side of the cover, for surface wiring.
Place the PCB into the back with the four way connector to the top, terminate the four wires
into the screw terminals. Secure PCB with the screw and fiber washer, plug in keypad and fit
the base cover over the back. Refit top and bottom screws and then plug in handset RJ11
plug.
If the handset is going to be mounted on a 2x4 outlet box, use a Crabtree metal 2x4 blank
cover plate to mount the handset on.
8. Test Voltages
+ Positive 13,8V DC from PSU only
G Ground from PSU only
A 6V DC with respect to ground
B 6V DC with respect to ground
9. Operation
+ & G Lines
Only power from the PSU to all handset, doorstation & termination PCB

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Termination Board G + MH04T
+ G A B
MH04
Handset
1
+ G A B
MH04
Handset
9
+ G A B
MH04GS
Gate station
Gate Contact
PSU
MPS-1205
Door
Station
+ G A B
+ G A B
+ G A B
+ G A B
+ G A B
220V
AC
+ G A B
MH04
Handset
X
+ G A B
MH04
Handset
X
+ G A B
MH04
Handset
X
+ G A B
MH04GS
Gate station
Gate Contact
+ G A B
MH04GS
Gate station
Gate Contact
+ G A B
MH04GS
Gate station
Gate Contact
+
G
L
N
E
A & B Lines
Balanced audio pair for TX & RX audio
Code for data communication which include dialing, door release, busing out door station and
alarm panic.
10. Wiring diagram

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11. Guarantee
The MH04 home intercom is guaranteed by the manufacturer for a period of six months
from the date of delivery against faulty components and faulty workmanship (ex factory).
Manufactured by:
Microsound Systems CC
P.O. Box 38220
Booysens
2016
South Africa
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web: www.microsound.co.za