Merak MMk-656 User manual

INSTRUCTION
AND CONNECTION MANUAL
MMk-656
Compact
Emergency
Telephone
for Lifts

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 2 of 20
General description
The MMk-656 is an auto-dial handsfree telephone that ensures emergency communications for
lifts with total security. It is manufactured with latest technology and in accordance with current
regulations on safety matter. It complies completely with all the requirements of the European
standard EN 81-28. This manual includes the instructions of obligatory fulfillment for correct
connection of the device and its operation.
It is very important that all authorized staff to carry out tasks of installation and maintenance
of MERak devices have general knowledge of basic safety rules and know specifically the operating
instructions to ensure its proper handling and optimum performance.
The MERak devices should only be used for the purposes for which they were designed. Any
unauthorized modification is strictly prohibited.
Disclaimer
The manufacturer declines any responsibility to the purchaser of this product and third parties
for damages, losses, costs or work done due to accidents, product misuse, improper installation or
modification, repair, or unauthorized changes. Besides, in these cases warranty claims are excluded.
The technical information provided to the user is always the most current. The product manufacturer
declines all responsibility for printing errors and modifications.
PRECAUTIONS!
Only properly trained professionals authorized to operate the device, can install and
configure this product.
This device should only be used for its specific purposes.
The product mustn’t be modified and should always be installed and configured according
to the instructions in this manual and the corresponding specialized manuals.
It is convenient to test all the features of the device after installation and initial
configuration. This way its correct operation on normal operating conditions will be
ensured.
At the end of its useful life, DO NOT throws this device in the trash. It must be
delivered in a recycling drop-off site suitable for electrical and electronic material.

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 3 of 20
Contents
1. GENERAL CHARACTERISTICS............................................................................................................................... 4
1.1. Unpacking ............................................................................................................................. 4
1.2. Introducing device ................................................................................................................ 5
1.3. Characteristics ..................................................................................................................... 5
2. LOCATION, CONNECTION AND START-UP ...................................................................................................... 6
2.1. Location................................................................................................................................. 6
2.2. Electric Connection............................................................................................................... 6
2.3. Start-up ................................................................................................................................. 7
3. GENERATION OF ALARMS .......................................................................................................................................7
4. PERIODIC TEST CALL (EN 81-28) ........................................................................................................................ 8
5. CLEARING AN ALARM (EN 81-28).......................................................................................................................8
6. ALARM FILTERING (EN 81-28) ............................................................................................................................. 8
7. CONNECTORS .............................................................................................................................................................. 9
7.1. Switches (J1).......................................................................................................................... 9
7.2. Power supply (J2) .................................................................................................................. 9
7.3. RS-485 serial communications connector (J3) ................................................................. 10
7.4. Telephone line (J4) .............................................................................................................. 10
7.5. Intercom (J5) ....................................................................................................................... 11
7.6. Audio module (J6) ............................................................................................................... 11
7.7. SD memory (J7) ................................................................................................................... 11
7.8. Switches (J8)....................................................................................................................... 13
8. STATUS LED.................................................................................................................................................................13
9. ALARM STATUS SIGNALLING LEDS ..................................................................................................................14
10. LANGUAGE CONFIGURATION...............................................................................................................................14
11. CONNECTION IN MULTI-CAR MODE .................................................................................................................15
12. MONITORING BATTERY CHARGE .......................................................................................................................16
13. AUDIO ADJUSTMENT...............................................................................................................................................16
14. WIRING DIAGRAM..................................................................................................................................................... 17
15. RS-485 SERIES CHANNEL .................................................................................................................................... 17
15.1. Connections ........................................................................................................................ 17
15.2. Series channel commands............................................................................................. 18

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 4 of 20
1. GENERAL CHARACTERISTICS
The MMk-656 is a hands-free telephone with automatic dialling, which allows full duplex
communication between a lift car and an alarm reception centre or any telephone, to permit the
rescue of people trapped in lifts. Aside from performing this basic function, the equipment has been
fitted with a series of additional features for remote maintenance and monitoring of the lift. It
complies with the European standard EN - 81 28.
COMPACT. The unit incorporates a speaker and microphone, making it ideal for installation
behind the button panel of the car.
EN 81-28. It complies completely with all the requirements of the European standard EN 81-28.
REMOTE PROGRAMMING. The MMk-656 is completely programmable at a distance, whether by a
simple call from any telephone, or from a PC connected to a special modem in the reception centre. In
the first case, programming is carried out using the telephone's own keypad, and feedback is via a
synthesized voice.
INTERCOM. The MMK-656 incorporates an intercom (for the machine room). It is recommended
that the intercom terminal should be one specially designed for lifts, though any terminal at all ought
to work. This telephone permits programming of the set using its keypad, guided by voice assistance.
MULTI-CABIN. Several modules, up to the maximum of four, can be interconnected for a multi-
cabin system sharing a single telephone line, with no extra cabling required.
TEST CALLS. The MMk-656 can also automatically generate periodic emergency simulation calls
(test calls), and this can be so programmed as to monitor the correct functioning of the equipment at
all times, just as demanded by the standard EN. 81-28. If the test call functionality or remote
maintenance are used, it is only necessary to have a PC (or compatible), a modem and automatic
alarm management software.
REMOTE-MAINTENANCE. The set has an RS-485 communications bus to allow extensions to its
basic functions and to add peripherals to it for I/O control, floor announcement synthesizers, PLC
controllers and control systems, etc. Use of these buses allows the set to generate alarm calls in
response to external events and provides it with a remote maintenance system, so as to detect faults
and incidents in the lift control systems.
FLOOR SYNTHESIZER. By simply connecting a graphical module, a totally programmable floor
synthesizer is available at no extra cost.
1.1. Unpacking
Check the product package contains the following elements:
MMk-656 Compact Emergency Telephone for Lifts
Double-sided adhesive
Quick Setup Guide

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 5 of 20
1.2. Introducing device
1.3. Characteristics
The principal features of the MMk-656 are as follows:
Automatic calling of up to 4 pre-programmed numbers when an alarm is raised. Automatic
calling when a maintenance alarm is raised (need to rescue operators or communicate with
the centre).
Periodic simulated emergency calling (test, EN-81-28), with 2 pre-programmed numbers.
Automated remote maintenance calling with data upload to a dedicated pre-programmed
number.
Redundant security system to avoid false alarms.

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 6 of 20
Programmable ID (20 digits maximum) to identify the origin of the call in the operator's
database or at the alarm reception centre.
Supply tension from 10 to 30Vdc. Maximum current drawn 150mA.
Internal lead-acid battery charger incorporated. Maximum current drawn during battery
charging 400mA.
Activation and deactivation of car microphone (privacy mode).
Remote control and programming of the equipment from a PC using a modem, or from any
telephone.
Automatic “call progress”handling and control of call retries.
Remote monitoring of equipment status.
Different 4-digit access codes for different security levels (necessary for access to any function
or action on the equipment).
Complete remote control and maintenance capacity via telephone from the centre.
Possibility of connecting an intercom (telephone) to programme the set or communicate with
the car.
Possibility of connecting one or several graphical floor indicator modules.
Voice synthesizer to announce the floor or for fault advice.
Possibility of interconnecting up to 4 sets on the same telephone line with no need for extra
cabling.
Flush mounting in the panel with M6 through screws or using double-sided adhesive.
Different languages for programming and up to 2 simultaneous floor synthesizer languages.
2. LOCATION, CONNECTION AND START-UP
For optimum device performance, consider the following recommendations and electrical connection
location. Then proceed to start-up.
2.1. Location
The location recommended by MERak for the emergency telephone is in the lift car behind the
button panel, so that a trapped person can use the incorporated speaker and microphone to
communicate with the alarm centre.
In the event that the set cannot be installed behind the button panel, the J7 expansion connector
can be used to connect an audio module where it is desired. To facilitate mounting, the outer casing
has some through slots in M6 format, or the supplied double-sided adhesive can be used.
2.2. Electric Connection
With respect to the most advisable wiring scheme for the set, the ideal is to have a sufficiently
regulated power supply (10 –30VDC, 1A), as close as possible to the equipment. In this way,
unnecessarily long cabling, and capture of electromagnetic interference by the equipment from
adjacent electronic devices in the lift are avoided.

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 7 of 20
2.3. Start-up
1. Connect the device to the external power supply 10-30 Vdc (J2).
2. Check that the status led is turned on green light and the device plays locution “Lift Car
1”.
3. Connect the battery to the corresponding terminals (J2).
4. WARNING: Never connect the power supply to the terminals intended for batteries B+
and B-.
5. Connect the phone landline (J4).
3. GENERATION OF ALARMS
The emergency telephone MMk-656 is capable of making automatic calls to different pre-
programmed telephone numbers stored in memory, as different switches are thrown.
The different alarm generators are:
- Car alarm switch:
There are two car alarm generation points (see also section 14.14 WIRING DIAGRAM):
1. At the J1 ALC and J1.2 ALC terminals of the telephone module.
2. Connecting the audio module MMk-698/4, at its J2.1 and J2.2connector.
Following an audible countdown in the car, a call to the first number in the bank of registers
dedicated to storage of alarm telephone numbers (bank of registers 02 to 05) is initiated. If
communication cannot be established, the set will make a programmed number of automatic call
attempts to the numbers stored in the following registers.
If, within ten minutes of the generation of the alarm, the car button is pressed again, the set
will not start again from the first number of the list, but from the number following the last one called.
Once this time has passed, when the button is pressed again, the call attempts will again start from
the first number in the list.
- Maintenance alarm switch (SOS):
This alarm can also be raised at different points:
1. A switch at the pair of terminals J1 SOS/EOA and J1 SOS/EOA.
2. At specific terminals of the audio module (see the instruction manual available on MERak
website www.merakeurope.com).
It makes a call to the number stored in the first register of the equipment (register 01). This
switch is designed to offer the installer the possibility of communication with the centre in the event

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 8 of 20
of necessity, without the need to use the dedicated car alarm telephones. If communication cannot be
established, the set will pass to generating a car alarm call.
The entire call process according to the different programmable parameters is given in detail in
the annex to the Manual for Programming in Voice Mode available on the MERak website
www.merakeurope.com.
4. PERIODIC TEST CALL (EN 81-28)
The European standard EN 81-28 demands that the set should make a status verification call at
least every three days.
To this end, the MMk-656 has been provided with two memory registers (06 and 07), where the
numbers of the servers which log the test calls can be stored. Just as with the alarm numbers, it tries
with the first number in the list, and if this is not successful, it tries with the next number.
The factory default frequency of the call is every 3 days.
To avoid repeated calls, with the corresponding expense, arising from an incorrectly
programmed test number or the time interval between calls being too short, it has been so
programmed that when the equipment initiates a test call, it configures itself to make the following
call 24 hours later, but should communication be correctly established with the server which attends
test calls, the set will reconfigure itself again to the test call frequency defined in the database.
5. CLEARING AN ALARM (EN 81-28)
The European standard EN 81-28 requires that when an alarm is raised, the emergency phone
should remain in a special state ("awaiting alarm clearance") until the rescue of the persons trapped
has taken place and the maintainer of the installation confirms some action to clear the alarm, and so
returns the phone to its ready state and clears the alarm at the centre.
The MMk-656 has three methods to clear the alarm:
By a switch on the pair of terminals J1 SOS/EOA and J1 SOS/EOA.
By a programming command by intercom or external call *99#.
By a switch connected to the terminals of the audio module (see instructions on MERak
website www.merakeurope.com).
Until the alarm has been cleared, the equipment will remain in a special state and will indicate
this through its alarm progress indicator LEDs: see section 9
6. ALARM FILTERING (EN 81-28)
The European standard EN 81-28 states that the emergency telephone should be capable, in the
event that the control system detects that the car is not capable of trapping persons (for instance, at

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 9 of 20
ground level with the doors open), the car alarm should be disabled so as to avoid false alarms due to
vandalism.
For this case, the emergency telephone MMk-656 has an input at the pair of terminals J1 FILTR
and J1 FILTR. When this input is short-circuited, generation of alarms from the car is disabled.
7. CONNECTORS
To locate the connectors, see the wiring diagram in section 14.
7.1. Switches (J1)
At the J1 connector, two different switches can be interconnected. These can be
configured either as switches of type normally open (NO) or normally closed (NC), to effect
which the following command should be used *12#.
- At the pair of terminals J1 ALC and J1 ALC the car alarm is connected.
- At the pair of terminalsJ1 FILTR and J1 FILTR, activation of alarm filtering can be connected.
When this input is closed, generation of alarms from the car is disabled. This functionality is
required by the standard EN 81-28 and permits disconnection of the alarm when the car is not
capable of trapping persons.
- At the pair of terminals J1 SOS/EOA and J1 SOS/EOA the switch to generate a maintenance
alarm for the operators, which generates a call to the number stored in register 01 of the
telephone memories, can be connected. This possibility is included so that maintenance
personnel have a direct line in the event of problems, which is totally independent of the
conventional car alarm. It is possible to install various generation points in parallel without
any problem. This switch is not affected by alarm filtering.
Should there be an alarm open, this same switch also serves as the alarm clear switch,
for activation once rescue has taken place, as required by European standard EN 81-28.
- At the pair of terminals J1 AUX OUT and J1 AUX OUT, an LED indicator may be connected, or a
relay activated, depending on the application, with a maximum permitted power of 1W at 12V.
This output performs different functions according to how it is programmed by means of the
parameter *28: it can be activated if a cut in the electricity grid supply is detected, or it can be
configured to generate an output pulse of duration 1 second on receiving a command.
NOTE: The switch terminals are only designed to connect switches, and not to supply
other lift peripherals: connection of other devices could damage the equipment inputs.
7.2. Power supply (J2)
The MMk-656 module is fed by the J2 connector. The equipment supply tension is 10 Vdc
- 30 Vdc.
Connect the regulated power supply at the terminals J2 V+ (10-30 Vdc) and J2 V- (GND).

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 10 of 20
Connect the lead-acid battery at J2 B+ (battery 12 Vdc) and J2 B- (battery GND).
In this way, the set assumes responsibility for charging the battery and performs
measurement of the charge remaining. If desired, the set can generate automatic calls to the
maintenance company for the installation, in the event that the battery tension falls below the
threshold programmable by the user (as required by the standard EN. 81-28), or is
disconnected.
Programming the *08# register, the telephone will make these automatic calls in these
cases. To deactivate the calls, it is only necessary to deprogramme the same register.
If the supply equipment recommended by MERak is not used, a stable and regulated
source should be used, which should be located as close as possible to the set to avoid the
possible introduction of electromagnetic parasites in a long supply cable.
If it is not desired to use an emergency battery exclusively for the telephone (at the
responsibility of the installing company) but grid power only, this should be connected at the
terminals provided for the supply J2 V+ and J2 V-.
WARNING! NEVER connect the mains supply to the battery terminals.
7.3. RS-485 serial communications connector (J3)
Communication with the control system or other devices such as the graphical viewer
may be carried out via the J3 connector, which is an RS-485 interface. For more information see
chapter 15.
The transmission speed, the number of bytes and parity can be modified according to
the needs of the equipment where it is connected, but only by means of programming with the
software serviLift, available at the MERak website (www.merakeurope.com). A more detailed
explanation of how this bus functions can be found in the PC Mode Commands Manual, available
on MERak website.
7.4. Telephone line (J4)
To connect the set to a phone line, the J4.1 and J4.3 terminals should be used. This must
always be an analogue line.
Connection of the earth terminal J4.2 denoted , is used to protect the equipment from
high energy transients in the telephone lines caused by storms and similar phenomena. If the
connection to earth is omitted, the protection devices provided will be totally ineffective. The
equipment will work just the same in this case, but the probability of faults rises considerably.
MERak strongly recommends the use of this earth connection.
It is not recommended to use the emergency telephone connected to an exchange
because in the event of a power failure, availability of the telephone line is not guaranteed.

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 11 of 20
7.5. Intercom (J5)
Connection of the intercom is at the terminal J5.
The intercom may be any conventional analogue telephone capable of generating DTMF
tones. The intercom has two functions: on the one hand it allows speaking from the car to the
other set, and on the other hand it allows programming the MMk-656 using its own keypad and
assisted by programmed voice messages.
It is possible to install as many intercoms in parallel as is desired although not more
than two can be used simultaneously.
7.6. Audio module (J6)
If it should be desired, an audio module external to the set can be connected so as to
have a point for audio and alarm generation alternative to that of the main unit.
Interconnection with this external module is by means of the RJ-45 terminals J6.
For this, a male-male RJ-46 cable should be used. If the standard distance (3 metres)
needs to be extended, a longer conduit of 5 metres can be ordered, the maximum
recommended. In most cases, the standard conduit will be sufficient, since the distance
between the standard location of the set (behind the button panel), and the audio module
location should not exceed 3 metres.
Excessive length of the conduit may allow the induction of undesired signals and noise
into the communication.
7.7. SD memory (J7)
The set has a slot, J7, for the insertion of a Micro-SD card where the audio files
reproduced by the equipment and its configuration parameters are stored.
The boot and configuration parameter loading sequence for the set is described in the
flow diagram in the following figure.

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 12 of 20
Fig. 1: Status flow diagram during boot and insertion of SD
The set boots and reads the parameters stored in the telephone's internal flash memory, and if it
detects that an SD card is present, it will try to read the parameters from the file CONFIG.CFG.
Then, one of three things can happen:
The file CONFIG.CFG is found and the set is updated with the new parameters. Likewise, the
telephone flash memory parameters are overwritten by those from the SD card. The set
plays a message confirming that it has been updated.
The file CONFIG.CFG is not found on the SD card. One is created on the SD card using the
previous parameters from the telephone flash memory.
The file CONFIG.CFG is damaged or the data are incorrect. No action is carried out and the
update error is notified by means of a blinking red status LED.
In this way, if a card from a different set is inserted into this one, the parameters configured in
the old set are automatically copied to the new one, with no additional action being carried out.
For example, it might be very useful to use an SD card with parameters programmed as a master
to automatically programme new sets rapidly and avoiding programming errors.

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 13 of 20
7.8. Switches (J8)
The set has 4 switches located on the lower part (J8) to configure the car number and the
connection of the local speaker and microphone.
With switch number 1, the local microphone is activated/deactivated.
With switch number 2, the local speaker is activated/deactivated.
With switches 3 and 4, the car number is configured as in the following table.
Cabin 1
Cabin 2
Cabin 3
Cabin 4
Switch 3
ON
OFF
ON
OFF
Switch 4
ON
ON
OFF
OFF
Table 1: Car selection switches
8. STATUS LED
General status information for the equipment is displayed using different colours and blink
sequences on the status LED visible on the top cover. These statuses are summarised in the following
Table 8.1.
Green
Orange
Red
ON
Power ON
Ready
Loading/saving data
Out of order
Intermittent
Set online
Clear alarm
pending
SD error
Blinking
Incoming call
Green
Orange
Alternative
AC power OFF
Orange
Red
Alternative
Battery disconnected
Table 2: Equipment status according to status LED.
Green
Red
Alternative
Battery low

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 14 of 20
9. ALARM STATUS SIGNALLING LEDS
The four LEDs located on the face of the speaker, notify the evolution of the call as required by
the standard EN-81-28, in accordance with the following table:
Alarm status
Orange LED
Green LED
Countdown (3, 2, 1….)
Blinking
OFF
Alarm raised
Steady
OFF
Making call
Steady
OFF
ACK received
OFF
Steady
End of call
OFF
OFF
Alarm pending
Blinking
OFF
Table 3: Alarm status according to equipment LEDs
10. LANGUAGE CONFIGURATION
The MMk-656 can be configured to use different languages both for voice-assisted parameter
programming and for playing the car announcements.
In the case of playing car messages, up to 4 different languages can be selected, to be played
consecutively. For example: the countdown message played when the car alarm is pressed, if two
languages are configured, in this case Spanish and English, will be:
“Tres”…“Three”……….”Dos”…”Two”….etc.
The different languages are stored in the Micro-SD card in different numbered folders, by default
as follows:
1. Spanish
5. German*
9. Basque*
2. English
6. Portuguese
10. Turkish
3. French
7. Catalan
4. Italian*
8. Russian
*Available on request.
The telephone operation languages may be selected by entering a command in voice mode
(*81# and *82#): see the corresponding manual for more information.
These files are encoded in PCM format at 16 kHz 8bits, and may be edited easily with any audio
editing software similar to Audacity (http://audacity.sourceforge.net).

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 15 of 20
11. CONNECTION IN MULTI-CAR MODE
As mentioned earlier, WITHOUT any need for extra cabling, up to 4 MMk-656 emergency
telephones can share a single telephone line. It is also possible to mix them with MMk-643 and 644
models, provided that there are no more than 4.
Assignment of cabin number should be made using the J9 switches as described in table 7.9.
The factory default setting is number 1. Any ordering may be used.
IMPORTANT:
If no car is programmed as car 1, it will NOT be possible to receive incoming calls.
If two cars are programmed with the same number, it will NOT be possible to communicate
between them, and so neither will it be possible to reconfigure them remotely. Rather, they
will have to be programmed using the intercom.
Illustration 2: Connection in multicabin mode
An example of a sequence to switch car 1 to car 4, for a fixed line installation:
Whether by external call or the intercom. type:
*34#
The signalling using DTMF tones between the two telephones will be heard, and once the
voice message "Car 4" is heard, the car will have been correctly switched.
If the message is not heard, repeat the process.
NOTE: To perform the same sequence of car change in installations where the phone line is provided by
a GSM link, the following command should be used *64#.

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 16 of 20
12. MONITORING BATTERY CHARGE
The MMk-656 is designed to carry out a very precise measurement of the charge state of the
emergency battery connected to it. To perform this measurement, the telephone disconnects itself
from the electrical supply (terminals J2 V+ and J2 V-) every 2 hours to measure the battery charge.
On making this temporary disconnection from the electricity grid, if there is no battery
connected or it is very low, the set will be left without supply and will turn itself off. If electricity is
supplied to it again, it will restart but as of that moment the equipment will log the fact that it has
been reset due to the absence of battery, and will not carry out any more measurements until two days
have passed, to avoid its restarting itself every 2 hours. This anomalous situation will be signalled by
an alternating orange/red blink on the status LED.
If after two days, the measurement is made, and the necessary battery tension has been
recovered for the set not to turn itself off, it will return to its normal state and resume the normal
tension measurement cycle every two hours.
If the installation has been checked, or the battery has been replaced, manually, before the two
days have passed, the set can be restored to its normal battery state measurement cycle. To do this, it
is necessary to issue the command *91# or its equivalent in PC mode. Once this command has been
entered, and the programming process has been completed (hang up the intercom, or finish the call)
the equipment will disconnect itself from the grid supply to make another measurement, and
therefore we need to wait a bit over a minute for it to check the tension of the updated battery.
In the event that the battery passes the lower tension threshold defined as low battery (11.00VDC
by default), the status LED will signal the status by alternating green and red. In this state, battery
measurements will continue to be made every two hours, and if it charges sufficiently and passes the
recovered battery tension threshold (by default 12.00DC), the set will return to its ready state.
The minimum and maximum thresholds may be modified by means of their corresponding
commands in PC mode.
13. AUDIO ADJUSTMENT
The MMk-656 has two audio adjusters by means of potentiometers located on the upper part of
the set, accessible from orifices in the lower part.
The adjuster labelled 1controls the level of the speaker incorporated into the telephone module.
The adjuster labelled 2controls the sensitivity incorporated into the telephone module.
NOTE: While the set comes from the factory with optimal audio levels already configured, it is
essential to carry out a test call during the installation, to check the correct functioning of the system,
since once installed in the car, the position of the audio module or possible obstacles in the audio
path may require that the gains be adjusted.

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 17 of 20
14. WIRING DIAGRAM
Illustration 3: Wiring diagram for the MMk-656
15. RS-485 SERIES CHANNEL
The J3 input corresponds to an RS-485 series channel.
The port configuration is 9 data bits without parity and one Stop bit (9N1), at 4800bps by default.
These parameters can be modified.
15.1. Connections
The communications connector J3 COM is of RJ-11 type and the layout and function of the pins
is:

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 18 of 20
Image 4: Connector J3
The number of data bits is modifiable between 8N1 and 9N1 (see programming manual II (PC),
command *A83y#©).
The speed of the channel is modifiable using a command in PC mode (see programming manual
II (PC), command *A86y#©).
Value
0
1
2
3
4
5
Speed (bps)
1200
2400
4800
9600
19200
38400
The structure of the commands available for the series channel is:
STX
Data
1
CHK
EOT
Where:
•STX: ASCII character 0x02 (STX). Start of frame.
•Data: Includes the code of the commands and the data necessary for their execution.
•CHK: Checksum of: 7 bits of the field “Data”. Calculation of the XOR of all the bytes of the
frame except STX and EOT. (Bit 7 always 1)
•EOT: ASCII character 0x04 (EOT). Indicates end of frame.
NOTE: To ensure correct transmission, all bytes transmitted which are not of synchronisation
(all except STX and EOT), will have the most significant bit set to 1.
15.2.Series channel commands
The commands available are the following:
PLAY VOICE MESSAGES IN THE CAR
The control system or other devices such as the graphical viewer transmit this frame to the
emergency telephone so that it generates a synthesized voice message audible in the car.
NºPin
Function
3
485-B
4
485-A
5
GND

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 19 of 20
Command structure:
0x02 + 0xF1 + Car + Sint 1 + Sint 2 + ©+ 0x04
Car: This is the number of the destination car for the command frames. Its range goes from
0x80 to 0x83 (Car 1 - Car 4).
©:Checksum of the frame calculated as the XOR of all the bytes of the frame except STX and
EOT.
The most significant bit of each byte except STX and EOT is always forced to be 1 to avoid
conflicts with the frame synchronisation characters.
Sint 1, Sint 2: These are the messages which it is desired to reproduce in the module of the lift
car and they are generated from the combination of messages in the following table.
Sint 1
Message
Sint 1
Message
Sint 2
Message
x0h
Silence
0xh
Silence
01h
Silence
X2h
Silence
2xh
Minus
37h
Silence
X4h
Lower ground
38h
Lower ground
X6h
Car park
39h
Car park
X8h
Floor
3Ah
Car park
3Bh
Mezzanine
3Ch
Attic
3Dh
Upper attic
3Eh
Lift out of order
3Fh
Overloaded
40h
Doors open
41h
Doors closed
4Fh
Lower
51h
Zero
52h
One
53h
Two
54h
Three
55h
Four
56h
Five
57h
Six
58h
Seven
59h
Eight
5Ah
Nine
5Bh
Ten
5Ch
Eleven
5Dh
Twelve
5Eh
Thirteen
5Fh
Fourteen
60h
Fifteen
61h
Sixteen
62h
Seventeen
63h
Eighteen
64h
Nineteen
65h
Twenty
66h
Twenty-one
67h
Twenty-two
68h
Twenty-three

MERak MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 –S2.5 ©MERak. All rights reserved
Instruction and Connection Manual 20 of 20
69h
Twenty-four
6Ah
Twenty-five
6Bh
Twenty-six
6Ch
Twenty-seven
6Dh
Twenty-eight
6Eh
Twenty-nine
6Fh
Thirty
Table 4: Synthesized voice message table
Messages are formed by combining a message from each of the columns.
For instance, to build the phrase "Floor One", choose "Floor" from the first column, "Silence" from
the second and "One" from the third. Hence the values of Sint 1 and Sint 2 will be chosen as follows:
Sint1 = “Floor”+ “Silence”= 0x08 + 0x00 = 0x08,
We always force bit 7 to be 1, and so finally,
Sint1 = 0x88.
Similarly for Sint 2:
Sint 2 = “One”= 0x52, (again we set the most significant bit to 1) and it becomes 0xD2.