FunkTronic Major BOS 4a User manual

Major BOS 4a

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Table of Contents
Connectivity............................................................................................................................. 4
Control and Display Elements ................................................................................................. 5
Keypad................................................................................................................................. 5
Busy Status LED.................................................................................................................. 5
Transmitter Status LED........................................................................................................ 5
Channel Selection LED........................................................................................................ 5
Loudspeaker / Volume LED Display .................................................................................... 5
Display and Control Elements ................................................................................................. 6
Communication with one Calling Radio Subscriber ................................................................ 7
Channel Selection................................................................................................................ 7
Communicating with the Calling Radio Subscriber.............................................................. 7
Loudspeaker (On/Off status)................................................................................................ 9
Loudspeaker (Volume Control) ............................................................................................ 9
Headsets............................................................................................................................ 10
RX-AF-Outputs....................................................................................................................... 11
Encoder ................................................................................................................................. 12
External Signaling Device ..................................................................................................... 12
Transmitter Control................................................................................................................ 12
Audio-Frequency-Connection................................................................................................ 12
Microphone Selection............................................................................................................ 13
Channel Selection ................................................................................................................. 13
Opto-Coupler Input................................................................................................................ 14
Major BOS 4a´s in parallel Circuit ......................................................................................... 15
Activating of the Busy Lines............................................................................................... 15
Scanning of the Busy Lines ............................................................................................... 16

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Monitoring-Interface TBBBox4 (optional) .............................................................................. 17
Assigning Channels to the UGA-Modules ......................................................................... 17
Evaluation Functions ......................................................................................................... 18
Tape Control (Switching Contact) ...................................................................................... 19
Service Program.................................................................................................................... 20
Monitor Status.................................................................................................................... 21
Programming Mode EEPROM........................................................................................... 21
EEPROM-Address Layout ................................................................................................. 22
Chart: Jumper and Potentiometer ......................................................................................... 27
Layout.................................................................................................................................... 28
Adjustment Instructions ......................................................................................................... 29
Sockets Pin Layout Connection ............................................................................................ 30
Technical Data....................................................................................................................... 31
General Safety Instructions.................................................................................................... 33
Factory Returning Instructions for old Equipment................................................................. 33
Release Notes....................................................................................................................... 31

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Major BOS 4a
Major BOS 4a is a µC-controlled desktop controller unit for 2-way radio systems
controlling up to four radios. Different operating parameters can either be factory preset
or programmed during installation.
The Major BOS 4a is powered by an external +12V-DC power supply.
Up to four channels (radio sets, PA systems -/intercom etc.) can be connected, also
an external handset/headset, up to two external monitoring-interfaces (TBBox4), an
external signal source, a tape recorder and a AF-RX-amplifier for each channel.
Furthermore there is a RS232-connection, to which a terminal can be connected, or a
PC for external control.
There is a squelch input for each radio and also a PTT output, a busy-line,
an AF-input and AF-output. As the TX-AF-outputs are only active while transmitting,
several Major BOS 4a´s can be connected in parallel without any problems.
For detailed pinout see section Sockets Pin Layout Connection.
System / Connectivity
12VDC power supply connector (12VDC, external, max. 1,5A)
I2CI I²C-Bus
TB Tape recorder
RS232 RS 232 connection
PTT PTT (e.g. foot switch)
HS Headset
FK1 – 4 Transmit / Receive (channel 1 – 4, radio, PA system-/ .
Intercom, etc.)
Also see section Sockets Pin Layout Connection.

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Control and Display Elements
Keyboard
The keyboard holds the following functions for each of the four channels:
Funkkreis x Selection button
+ Volume higher
- Volume lower
L Loudspeaker mute button
S Special function button
I Caller button for encoder 1
II Caller button for encoder 2
PTT button
All buttons can be locked separately
Busy LED
For each of the four radios there is a separate busy LED. To control the busy LED the
carrier input can be switched to ground or to +12V (or an external reference voltage Uref).
The logic of the busy input can be configured separately for each radio with the jumpers
J10 to J13. To change the reference voltage (+12V or Uref) use jumper J5. For jumper
settings see Chart: Jumper and Potentiometer
TX-LED
For each of the four channels there also is a separate TX LED, which lights up when
the corresponding transmitter is activated. The transmitter is activated by pushing the
PTT button while talking or by transmitting a call. Flashing of the TX LED means that
another Major BOS 4a is using this channel. Also see section Major BOS 4a´s in parallel
circuit.
Channel Selection LED
The channel selection LED (separate for each channel) lights up permanently when the
corresponding channel is selected and activated. Flashing of the channel selection LED
means that this channel has already been selected by another Major BOS 4a. Also see
section Major BOS 4a´s in parallel circuit.
Loudspeaker / Volume LED Display
The loudspeaker / volume display (separate for each channel) is a row of LEDs and indi-
cates the volume setting. If the loudspeaker-AF for the corresponding channel is turned
off the display turns dark.

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Display and Control Elements
1 - Transmiting- , Squelch- , Selection Status LED
2 - Channel Selection Buttons
3 - Volume Display (row of LEDs)
4 - Volume Control Buttons (+/ - )
5 - Loudspeaker Buttons (mute)
6 - Special Function Buttons
7 - Encoder Buttons (I/II)
8 - PTT (for gooseneck or headset microphone)
9 - Loudspeaker
10 - PTT Button (for handset)
11 - Handset
12 - Gooseneck Microphone
1
4
5
6
8
7
9
2
3
10
11
12

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Calling a single Radio Subscriber
Channel Selection
To activate one of the four channels push the corresponding selection button. To
deactivate a channel again push the corresponding selection button once more.
Depending on the configuration of the EEPROM-Register 030 in Bit 1 you can either
select several channels simultaneously or only one channel at a time.
Register 030 Number of selectable channels
Bit 1: 0 = several channels simultaneously (cumulative)
1 = only one channel at a time selected
When channels are activated the channel selection LED lights up. If the channel has
already been selected by a different Major BOS 4a the device can be programmed so
that the corresponding channel selection LED flashes.
Also see section Parallel circuit of several Major BOS 4a´s.
!!) In the EEPROM-Register 024 you can preselect which of the channels 1..4 (Bit 0..3)
is automatically selected after turning on the radio installation.
Register 024 selected channels after turning on
Bit 0: Channel 1 No / Yes (0/1)
Bit 1: Channel 2 No / Yes (o/1)
Bit 2: Channel 3 No / Yes (0/1)
Bit 3: Channel 4 No / Yes /0/1)
It is possible to configure the EEPROM-Register 027 so that the selected channels are
automatically saved in the EEPROM-Register 024 when the radio installation is turned
off.
Register 027 Save the selected channels No / Yes (00/01)
Communicating with the Radio Subscriber
There are three different ways of communication with a calling radio subscriber:
a) By pushing one of the red PTT buttons the transmitter of the corresponding channel
is activated on (the corresponding sending status LED lights up) and you can talk to the
caller through the gooseneck microphone. (It is also possible to connect an external switch
contact instead of a PTT button. See section Opto-Coupler input.) If another controlling
device is already transmitting on a channel the Major BOS 4a can be programmed so
that the corresponding sending status LED flashes and optionally the PTT button is
blocked. Also see section Parallel circuit of several Major BOS 4a´s. After depressing
the PTT button the caller can be heard on the loudspeaker. The receiver volume of the
corresponding channel is adjustable, see section Loudspeaker (Volume setting).

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b) By picking up the handset and pushing the PTT button on the inside of the
handset. By doing so the transmitter of the selected channel is activated (TX
LED lights up) and you can talk with the caller through the microphone of the
handset.
If another controlling device is already transmitting on a channel the Major BOS
4a can be programmed so that the corresponding TX LED flashes and optionally
the PTT button is blocked. Also see section Parellel circuit of several Major
BOS 4a´s.
Depending on the configuration you can hear the caller constantly on the handset
or only after deactivating the PTT button, see section Loudspeaker.
The call is ended by replacing the handset.
The volume of the earpiece and the microphone are each adjustable by a
potentiometer. The potentionmeter is situated near the earpiece of the handset
and is easily accessible from the outside, using a screw-driver through a small
opening on the inside of the handset.
c) By connecting a compatible handset/headset and pressing the corresponding
PTT button PTT2 (e.g. a foot switch). By doing this the transmitter of the selected
radio channel is also turned on (TX LED lights up) and you can talk with the caller
through the microphone of the handset/headset. (It is also possible to connect
another external switch contact. See section Opto-Coupler input.)
If another controlling device is already transmitting on a radio channel the Major
BOS 4a can be programmed so that the corresponding TX LED blinks and
optionally the PTT button is blocked. Also see section Parallel circuit of several
Major BOS 4a´s.
Depending on the configuration you can hear the caller constantly on the handset
or only after depressing the PTT button, see section Loudspeaker.
After deactivating the PTT button you can also hear the caller on the loudspeaker.
The volume of the corresponding channel is adjustable, see section Loudspeaker
(volume setting).
The microphone level of the handset/headset can be adjusted with the
potentiometer P10 and the level of its loudspeaker with the potentiometer P12.
!!) After ending the call the activated radio channel can be deactivated by pressing
the corresponding selection button again.

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Loudspeaker Switching Status
The built in loudspeaker is automatically turned off during transmission.
It is also possible to configurate the EEPROM-Register 02A in Bit 1 so that the
loudspeaker is also turned off automatically when the handset is lifted.
Register 02A Loudspeaker switching status when handset is lifted
Bit 1: 0 = Loudspeaker ON
1 = Loudspeaker OFF
The receiver-AF (on the loudspeaker) of individual radio channels can either be muted
manually by pressing the loudspeaker buttons or automatically when the correspending
busy line is activated (see section Parallel circuit of several Major BOS 4a´s).
If the loudspeaker-AF of a certain radio channel is turned off, the corresponding volume
LED display (row of LEDs) turns dark.
!!) In the EEPROM-Register 025 the loudspeaker switching statuses of the radio channels
1..4 (Bit 0..3) can be preselected after turning on the radio installation.
Register 025 Loudspeaker switching status after turning on
Bit 0: Channel 1 OFF/ON (0/1)
Bit 1: Channel 2 OFF/ON (0/1)
Bit 2: Channel 3 OFF/ON (0/1)
Bit 3: Channel 4 OFF/ON (0/1)
In addition it is possible to make a configuration in the EEPROM-Register 028 so that
loudspeaker switching statuses are automatically saved in the EEPROM-Register 025
when the radio installation is turned off.
Register 028 Saving the loudspeaker switching statuses
No/Yes (00/01)
The EEPROM-Register 02A in Bit 0 can be configurated so that the receiver-AF of all
radio channels (without muting) is switched to the loudspeaker or that the corresponding
radio channels also have to be activated additionally.
Register 02A Receiver-AF on loudspeaker
Bit 0: 0 = all radio channels without muting
1 = only activated radio channels without
muting
Loudspeaker (Volume Control)
The volume of the loudspeaker which is turned on can be set separately with the volume
buttons (+ = higher, - = lower) for each radio channel. The volume level is displayed on
the LED chain.

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!!) In the EEPROM-Registers 018...01B the volume settings (´01..´08) for each radio
channel can be preselected separately after turning on the radio installation.
Volume after switching on for
Register 018 Channel 1
Register 019 Channel 2
Register 01A Channel 3
Register 01B Channel 4
In the EEPROM-Register 029 you can also make a configuration so that the selected
volume settings are automatically saved in the EEPROM-Registers 018...01B when the
radio installation is turned off.
Register 029 Save Volume setting No / Yes (00/01)
Earphones
The receiver-AF of the selected radio channel can always be heard on the earphones of
the handset and the headset.
The earphone-AF of individual radio channels can be muted either manually by pressing
the selection buttons or automatically by transmitting on the active or on one of the other
radio channels (earphone muting).
a) In the EEPROM-Register 022 a configuration for the radio channels 1..4 (Bit 0..3)
can be made so that the earphone-AF for the active radio channel is muted while
transmitting.
Register 022 Earphone-AF (while transmitting on the active channel) for
Bit 0: Channel 1 OFF / ON (0/1)
Bit 1: Channel 2 OFF / ON (0/1)
Bit 2: Channel 3 OFF / ON (0/1)
Bit 3: Channel 4 OFF / ON (0/1)
b) In the EEPROM-Register 023 a configuration for the radio channels 1..4 (Bit 0..3)
can be made so that the earphone-AF is muted while transmitting on a different radio
channel.
Register 023 Earphone-AF (while transmitting on a different radio channel) for
Bit 0: Channel 1 OFF / ON (0/1)
Bit 1: Channel 2 OFF / ON (0/1)
Bit 3: Channel 3 OFF / ON (0/1)
Bit 4: Channel 4 OFF / ON (0/1)

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RX-AF-Ausgänge
The volume controlled receiver-AF can be tapped individually for each radio channel on
the Major BOS 4a. The outputs can be used e.g. for connecting external AF-amplifier
(per radio channel).
The receiver-AF (for the AF-RX-outputs) of individual radio channels can be muted
either
- manually by pressing the loudspeaker buttons or
- automatically by activating the corresponding busy lines
(see section Parallel circuit of several Major BOS 4a´s) or
- automatically by transmitting on the active or a different radio
channel
There is one Muting-Output per radio channel with which the connected AF-RX amplifier
can be muted when there is no receiver signal (busy??/squelch) (output switches to
GND). See section Sockets Pinout.
a) In the EEPROM-Register 020 a configuration for the radio channels 1..4 (Bit 0..3)
can be made so that the AF-RX-Output is muted while transmitting on the own radio
channel.
Register 020 AF-RX-Output (while transmitting on the active radio
channel) for
Bit 0: Channel 1 OFF / ON (0/1)
Bit 1: Channel 2 OFF / ON (0/1)
Bit 2: Channel 3 OFF / ON (0/1)
Bit 3: Channel 4 OFF / ON (0/1)
b) In the EEPROM-Register 021 a configuration for the radio channels 1..4 (Bit 0..3) can
be made so the AF-RX-Output is muted while transmitting on a different radio channel.
Register 021 AF-RX-Output (while transmitting on a different
radio channel)for
Bit 0: Channel 1 OFF / ON (0/1)
Bit 1: Channel 2 OFF / ON (0/1)
Bit 2: Channel 3 OFF / ON (0/1)
Bit 3: Channel 4 OFF / ON (0/1)

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Encoder
The Major BOS 4a has an integrated encoder for ID 1 and ID 2. The calls for each
channel are transmitted directly with the corresponding buttons on the keyboard (I or II).
The ID is transmitted as long as the corresponding button is being pressed.
.
Externel Signaling Device
An external signaling device can be connected to the Major BOS 4a. The sensitivity of
the potential-free inputs can be adjusted with the potentiometer P11.
By activating the corresponding PTT button input (PTT3)the external signal is transmitted
via the selected radio channel.(An additional external switch contact can be connected as
PTT button. See section Opto-coupler input.)
Transmitter Control
The transmitters of the selected radio channels are activated with one of the PTT buttons
(e.g. handset or headset) and stay activated as long as the PTT button is being pressed.
During transmitting the corresponding transmitters are automatically activated.
It is always possible to transmit on non-activated radio channels by using the red PTT
buttons on the control panel.
If another controlling device is already transmitting on a channel the Major BOS 4a can
be programmed so that the corresponding sending status LED flashes and optionally the
PTT button is blocked. Also see section Parallel circuit of several Major BOS 4a´s.
The transmitter control can be switched to ground or to +12V (or an external reference
voltage Uref). The logic of the PTT button outputs can be configured separately for each
radio with the jumpers J6 to J9. To change the reference voltage (+12V or Uref) use
jumper J5.
By using the Open-collector outputs it is easily possible to connect several Major BOS
4a´s in parallel circuit.
For jumper settings see Chart: Jumper and Potentiometer.
AF-Connection
The audio-frequency-connection is not integrated in the Major BOS 4a anymore. But
by connecting the external headset-adapter the headset can be used as a combined
communicating device for telephone and radio.
The headset is switched to the telephone by an opto-coupler input, which has to be
programmed accordingly (see section Opto-Coupler input).

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Microphone Selection
For each of the 3 PTT inputs it is possible to program the corresponding microphone
individually in register 052. Additionally there are two automatic possibilities to detect the
headset. Either the PTT2 input can be programmed as headset detection (programming
register 04C) or the Major BOS 4a can detect if a headset is connected by measuring the
headset supply voltage (programming register 051/052). The threshold level in register
051 has to be set so that the measured supply voltage (at ST10 between Pin 2 and 5)
without headset is higher and with headset is lower than the threshold level. If the PTT2
input is used as headset detection the Major BOS 4a detects the headset when the input
is activated (bridge to ground (GND)). If the Major BOS 4a has detected a headset then
all buttons programmed as SH/HS/PTT use the headset microphone. Otherwise they use
the gooseneck microphone.
Channnel Selection (additionally)
In register 04E you can program whether the loudspeaker is turned on simultaneously
when activating the radio circuit. In register 04F you can program whether the loudspeaker
is turned off simultaneously when deactivating the radio circuit.

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Opto-Coupler Input
The Major BOS 4a has an opto-coupler input at connector ST10. This opto-coupler
input can be programmed for different functions.
a) If this register is encoded to value ´00´, the opto-coupler input switches the handset/
headset to the audio-frequency-connection when activated (standard function, see
section Audio-Frequency-Connection).
b) The opto-coupler input can also be used to emulate certain key functions
of the switch panel or to make switching functions for special applications possible.
To do this the assignment to the radio channels is coded at the 1st digit (High-Nibble)
in the EEPROM-register 047. At the 2nd digit (Low Nibble) the key function resp. the
special function which is to be emulated, is encoded:
Register 047 Opto-coupler input
Special function
00 = control the telephone relais
10 = microphone switching for PTT2
PTT2 transmits by gooseneck microphone, when opto-
coupler is turned on
20 = microphone switching for PTT2
PTT2 transmits by gosseneck microphone when
opto-coupler is turned off
1st digit Assignment to
0 = all activated radio channels
1..4 = radio channel 1..4
2nd digit emulated key / special function
0 = (-no function -)
1 = radio channel (selction)
2 = volume higher
3 = volume lower
4 = loudspeaker ON / OFF
5 = call 2
6 = call 1
7 = transmit (gooseneck microphone)
8 = transmit (microphone of handset/headset)
9 = transmit (external encoder)
A = special functions button
B = transmit (SH or HS-micro), PTT2 selects micro
C = transmit (SH or HS-micro), switching by automatic
headset detection
To activate the opto-coupler input direct current (3V < U < 15V) is necessary. For higher
switching voltages an additional external dropping resistor is necessary (internal dropping
resistor = 1kOhm).

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Major BOS 4a's in Parallel Circuit
Several Major BOS 4a´s can be interconnected without any problems as the AF-outputs
are only activated during transmitting and the AF-outputs can be switched to high-
impedance by replugging of jumper J1 to J2.
For this purpose all connections with the individual radio channels (TX-AF, RX-AF,
squelch and transmitter PTT) only have to be connected in parallel circuit (bus- or hub
wiring).
Here the busy lines of the radio channels, which can only be connected with the Major
BOS 4a´s , have a special function.
Activating the Busy Lines
Each Major BOS 4a, which is connected to the corresponding busy line, can signalize
to other Major BOS 4a´s in paralle circuit, if a radio channel has already been selected
and/or if a radio channel is already used for transmitting.
a) In the EEPROM-register 02B it is possible to make a configuration for the radio
channels 1..4 (Bit 0..3) so that the corresponding busy line is activated if selected.
Register 02B Activating busy line when channel is selected
Bit 0: Radio channel 1 NO / YES (0/1)
Bit 1: Radio channel 2 NO / YES (0/1)
Bit 2: Radio channel 3 NO / YES (0/1)
Bit 3: Radio channel 4 NO / YES (0/1)
b) In the EEPROM-register 02C it is possible to make a configuration for the radio
channels 1..4 (Bit 0..3) so that the corresponding busy line is activated when transmitting
(on this channel).
Register 02C Activating busy line when transmitting on
Bit 0: Radio channel 1 NO / YES (0/1)
Bit 1: Radio channel 2 NO / YES (0/1)
Bit 2: Radio channel 3 NO / YES (0/1)
Bit 3: Radio channel 4 NO / YES (0/1)

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Scanning of the Busy Lines
Each Major BOS 4a, which is connected to the corresponding busy line, detects an
activated busy line and reports this optically to the user as a blinking channel selection
LED or as a blinking TX LED .
This optical display can be configurated in the EEPROM-register 02D for the radio
channels 1..4 (Bit 0..3).
Register 02D Optical busy-LED for
Bit 0: Radio channel 1 as blinking channel selection LED / TX LED (0/1)
Bit 1: Radio channel 2 as blinking channel selection LED / TX LED (0/1)
Bit 2: Radio channel 3 as blinking channel selection LED / TX LED (0/1)
Bit 3: Radio channel 4 as blinking channel selection LED / TX LED (0/1)
You can also configure how the Major BOS 4a treats busy radio channels: e.g. the
transmitter PTT can be disabled and/or the receiver-AF for the loudspeaker (and the RX-
AF output) can be muted:
a) In the EEPROM-register 02E it is possible to make a configuration for the radio
channels 1..4 (Bit 0..3)so that the PTT is disabled when the radio channel is busy.
Register 02E PTT is disabled when the channel is busy
Bit 0: Radio channel 1 NO / YES (0/1)
Bit 1: Radio channel 2 NO / YES (0/1)
Bit 2: Radio channel 3 NO / YES (0/1)
Bit 3: Radio channel 4 NO / YES (0/1)
b) In the EEPROM-register 02F it is possible to make a configuration for the radio
channels 1..4 (Bit 0..3) so that the loudspeaker-AF is muted when the radio channel is
busy.
Register 02F Loudspeaker-AF is muted when the channel is busy
Bit 0: Radio channel 1 NO / YES (0/1)
Bit 1: Radio channel 2 NO / YES (0/1)
Bit 2: Radio channel 3 NO / YES (0/1)
Bit 3: Radio channel 4 NO / YES (0/1)

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Monitoring-Interface TBBox4 (Accessories)
The optional monitoring-interface TBBox4 can be looped in to max. 4 radio channels in
order to connect a multi-track voice recorder and/or to interpret or transmit signaling on
the radio channels with the help of a PC if the TBBox4 is equipped with the corresponding
UGA-modules (option)(using a modem).
For this purpose the external PC is connected by the integrated RS232-interface of the
TBBox4.
Together with the Major BOS 4a certain calls like tone sequences or single tones (e.g.
call 1, call 2), which are preprogrammed in the TBBox4, can be evaluated. The evaluation
status is transmitted to the Major BOS 4a by the I²C-Bus (connector ST14).
If the Major BOS 4a is used in bigger systems together with Major BOS 8 units up to
eight radio channels and therefore up to two TBBox4 units can be attached.
In this case, if the 4 radio channels of the Major BOS 4a are to be connected on two
separate TBBox4 units, their control inputs have to be connected to the I²C-Bus-
concentrator I2C-Con. In this case the I²C-Bus-adresses of the TBBox4 units have to be
coded differently (please ask for advice!). Also see manual Major BOS 8.
For programming the TBBox4 see manuals Monitoring-Interface TBBox4 and Universal-
encoder/decoder-module UGA00.
Assigning Channels to the UGA-Modules
Each TBBox4 can be equipped with max. 4 UGA-modules, so that up to 8 UGA-modules
are available for decoder functions when 2 TBBox4 units are connected..
The individual radio channel numbers (´01´...´04´) in the EEPROM-registers 031...038
can be assigned freely to these 8 UGA-modules. If no radio channel is to be assigned to
a certain UGA-module set the radio channel number to value ‘00’.
Assigned radio channel number for
register 031 UGA(1)/TBBox4(1)
register 032 UGA(2)/TBBox4(1)
register 033 UGA(3)/TBBox4(1)
register 034 UGA(4)/TBBox4(1)
register 035 UGA(1)/TBBox4(2)
register 036 UGA(2)/TBBox4(2)
register 037 UGA(3)/TBBox4(2)
register 038 UGA(4)/TBBox4(2)
Ex factory the EEPROM-registers 031...034 are programmed in sequence with the radio
channel numbers 01...04 and the EEPROM-registers 035...038 with the value ‘00’ (no
radio channel assigned).

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Decoder Functions
Each TBBox4 can be equipped with max 4 UGA-modules, so that up to 8 UGA-modules
are available for decoder functions when 2 TBBox4 are connected.
Each UGA-module can be programmed so that when certain signalings (single tones, tone
sequences) are decoded either one of the two switching outputs DEC1 or DEC2 briefly
(e.g. 1 sec)switches to ground (GND). See manuals Monitoring-Interface TBBox4 and
Universal-encoder/decoder-module UGA00.
The status of the switching outputs DEC1 and DEC2 of all UGA-modules is transmitted to
the Major BOS 4a and causes the loudspeaker-AF of the corresponding radio channels
to be turned on(if it was turned off before):
a) If the switching output DEC2 is turned on because of the UGA-decoding, then the
loudspeaker-AF of the corresponding radio channel is turned on permanently.
b) If the switching output DEC1 is turned on because of the UGA-decoding, then the
loudspeaker-AF of the correspong radio channel is turned on for the duration T. The
duration T can be programmed separately for the radio channels 1..4 in the EEPROM-
registers 03D...040 in steps of seconds (Value coded as HEX-Number in seconds).
Register 03D Radio channel 1
Register 03E Radio channel 2
Register 03F Radio channel 3
Register 040 Radio channel 4
Ex factory the EEPROM-registers 03D...040 are programmed with the Hex-value ‘0A’
(10*1sec=10sec).
Tape Control (switching contact)
The switching contact for controling the tape (Start/Stop) can be configured separately for
each of the two TBBox4 units.
In the EEPROM-registers 039 respectively 03A you can code which radio channels 1..4
(Bit 0..3) control the audio tape switching contact of the TBBox4(1) resp. TBBox4(2).
Register 039 Audio tape switching contact TBBox4(1) controlled by
Bit 0: Channel 1 NO/YES (0/1)
Bit 1: Channel 2 NO/YES (0/1)
Bit 2: Channel 3 NO/YES (0/1)
Bit 3: Channel 4 NO/YES (0/1)
Register 03A Audio tape switching contact TBBox4(2) controlled by
Bit 0: Channel 1 NO/YES (0/1)
Bit 1: Channel 2 NO/YES (0/1)
Bit 2: Channel 3 NO/YES (0/1)
Bit 3: Channel 4 NO/YES (0/1)

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Tape Control (Switching Contact) (continued)
The tape control switching contacts are activated with each PTT or squelch/carrier
detection of the corresponding radio channels. After discontinuation of these conditions
they are deactivated automatically after the delay time T.
The delay time T can be programmed separately for the tape control switching contacts
of the TBBox4(1) resp. TBBox4(2) in the EEPROM-registers 03B resp. 03C in steps
of 100ms.
Delay time T = N*100ms (enter as Hex-value!!!)
Register 03B Delay time for tape control switching contact TBBox4(1)
Register 03C Delay time for tape control switching contact TBBox4(2)
Ex factory the EEPROM-registers 03B and 03C are programmed with the Hex-value „32”
(50*100ms = 5sec).
The own tape control switching contact (ST5 / Pin2) is activated as long as one of the two
TBBox4 switching contacts is activated.

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Serviceprogramm
The Major BOS 4a has a RS-232-interface with the following specifications:
19200 Baud, 1 startbit, 8 databits, no parity, 1 stopbit
The connectors for the RS-232-interface (RXD, TXD, GND) are located on the 8-pole
RJ45-plug ST15 inside. See section Sockets pin layout.
To use the service program, a simple terminal or a PC with terminal program has to be
connected to this RS-232-interface.
For this purpose the data format resp. the interface has to be set to the above mentioned
specifications.
If Windows is installed on your PC, you can configure the standard Windows terminal
program (e.g. Hyperterminal) accordingly, choosing the option protocol = X on / X off.
(Therfore you only have to connect the three pins RXD, TXD and GND.
If the terminal (or the PC) is connected correctly, you will have access to the service
program and to a range of service commands for:
- programming mode EEPROM
- software reset
To start the service program just enter <return> or <$A2>, <return>. The following text
will appear on the screen:
Online – Monitor PIC 16F877A Software ,MBOS4a`V 2.0
vom (Datum) ( C ) FunkTronic , 01-07
Rxxx Read EEPROM Register xxx
Pxxx_yy Program yy in EEPROM Register xxx
X Reset
#
Please note: the character _ means <space> resp. <blank>.