JETI model Central box 310 User manual

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®
User Manual
EN
Central box 310Central box 310Central box 310
Central box 320Central box 320Central box 320

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1. Introduction ..................................................................................... 3 EN
1.1 Attributes .................................................................................. 4 EN
2. Description ........................................................................................ 5 EN
2.1 Central Box 310 ....................................................................... 5 EN
2.2. Central Box 320 ....................................................................... 6 EN
2.3 Magnetic switch ...................................................................... 8 EN
3. Connection ....................................................................................... 9 EN
3.1 Power supply of Central Box 310/320 .................................. 9 EN
3.2 Overload protection of servos (Central Box 320) ............ 11 EN
3.3 Connecting Central Box – EX Bus ........................................ 12 EN
3.4 Alternative functions – digital inp ................................. 14 EN
3.5 Alternative functions – digital output ............................... 15 EN
3.6 Installing safety mechanism of connectors ..................... 15 EN
4. Configuration via JETIBOX ....................................................... 16 EN
4.1 Actual values .......................................................................... 16 EN
4.2 Minimum / Maximum values .............................................. 17 EN
4.3 Setting ..................................................................................... 18 EN
4.4 Out Pin Set .............................................................................. 19 EN
4.5 Alarms ..................................................................................... 21 EN
4.6 Service information .............................................................. 21 EN
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5. Configuration via the DC/DS transmitter ............................. 22 EN
5.1 Setting ..................................................................................... 23 EN
5.2 Alternate functions of pins .................................................. 24 EN
5.3 Servo Fail-Safe ....................................................................... 25 EN
5.4 Servo Output Mapping ........................................................ 26 EN
5.5 Telemetry ............................................................................... 27 EN
5.6 Telemetry Min/Max .............................................................. 27 EN
5.7 Reset to factory settings ..................................................... 28EN
6. Firmware update ........................................................................... 29 EN
7. Safety precautions for working with magnets ................... 30 EN
8. Technical specifications of the Central Box .......................... 31EN
9. Warranty, service and the technical support ....................... 31EN
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The Central Box is a switchboard designed for the complete
management of servos in a model with an emphasis on safety. The
Central Box 320 has a unique design that provides overload
protection at each servo output. The Central Box 310 offers
maximal unreduced power for each servo (servo outputs do not
have overload protection). The Central Box can manage up to two
batteries and fully supports the JETI EX telemetry system. Up to
three receivers with serial (PPM, EX Bus, S.BUS) output can be
connected to the Central Box 310 and 320. With JETI DC/DS
transmitter, the full potential of the Central Box can be used, such as
an easy way to configure the Central Box, EX telemetry, and very fast
servo response. Central Box 310 and 320 have a fully adjustable and
very powerful BEC for powering all connected servos.
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1 Introduction English

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1.1 Attributes
Central Box 310/320
• Central Box 310 comes as standard without protection fuses on
all channels
• Central Box 320 has overload protection on each channel (8
outputs for high-torque servos and 10 outputs for standard
servos)
• Support of DITEX TD telemetry servos
• Possibility to connect up to 3 receivers with serial interface to
(PPM, EX Bus, S.BUS)
• Built-in Expander function for up to 4 sensors
• Input for magnetic switch or RC switch
• 2 x MPX battery input connectors
• 100Hz mode of servo outputs (10ms period)
• Supports EX telemetry (voltage, current, capacity, temperature
measurement, …)
• Easy settings changes via DC/DS transmitter
• Firmware updates by user
• Suitable for use with standard or high voltage (HV) servos
• Compact size for easy installation
• Each output is individually configurable (channel assignment,
trim, reverse, ATV)
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2 Description
2.1 Central Box 310
• Central Box 310 has 18 outputs for servos (support of DITEX TD
telemetry servos).
• Each of the outputs can be operated in these modes:
- servo output (default setting)
- Digital output
- Digital input
- Ditex
• Channels E2, E3 and E4 are also configurable to
alternative uses, such as:
- an input for telemetry sensor
- EX Bus expander – used for connecting devices which support
the EX Bus protocol (the Central Box, a sensor,…)
- S.BUS Output (only channel E2)
The E4 slot is also used for the firmware update connection (using
the USBa - USB adapter).
• E1/R3 port can be configured for use as:
- an output to connect a JETIBOX or Duplex EX receiver to
configure the Central Box
- an input for telemetry sensors
- EX Bus expander - used for connecting devices which support
the EX Bus protocol (the Central Box, a sensor,…)
- an input for receiver (supports only EX Bus protocol)
• R1 - primary input for connecting receivers with serial output
(EX bus, PPM or S.BUS)
• R2 - secondary input for connecting receivers with serial output
(EX bus, PPM or S.BUS)
• SWITCH - input is reserved for connecting a magnetic switch or RC
switch (optional accessories).
• BATT1 and BATT2 – MPX connectors for connecting to power the
servos and receivers connected to the Central Box.
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2.2 Central Box 320
• Central Box 320 has 18 outputs for servos (support of DITEX TD
telemetry servos) with individual overload protection. Each of the
outputs can be operated in these modes:
- servo output (default setting)
- Digital output
- Digital input
- Ditex
• Channels 1 - 4 and 15 - 18 have protection for high-torque servo
up to 60 Kg.cm.
• Channels 5 - 14 have protection for standard servo
up to 30 Kg.cm.
• Channels E2, E3 and E4 are also configurable to alternative uses,
such as:
- an input for telemetry sensor
- EX Bus expander – used for connecting devices which support
the EX Bus protocol (the Central Box, a sensor,…)
- S.BUS Output (only channel E2)
The E4 slot is also used for the firmware update connection
(using the USBa - USB adapter).
• E1/R3 port can be configured for use as:
- an output to connect a JETIBOX or Duplex EX receiver to
configure the Central Box
- an input for telemetry sensors
- EX Bus expander - used for connecting devices which support
the EX Bus protocol (the Central Box, a sensor,…)
- an input for receiver (supports only EX Bus protocol)
• R1 - primary input for connecting receivers with serial output (EX
bus, PPM or S.BUS)
• R2 - secondary input for connecting receivers with serial output
(EX bus, PPM or S.BUS)
• SWITCH - input is reserved for connecting a magnetic switch or RC
switch (optional accessories).
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2
3
4
5
6
7
1
12
13
14
15
16
17
18
9
R1
R2
8
10
11
E4
E3 E2
18 channel protected servo interface
E1/R3
INPUT VOLTAGE 6-14V
LED1 LED2
320320320
Pic. 1: Description Central Boxu 310/320
• BATT1 and BATT2 – MPX connectors for connecting batteries to
power the servos and receivers connected to the Central Box.
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RC Switch
Magnetic Switch

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2.3 Magnetic switch
The magnetic switch is used to turn the CB 310/320 ON or OFF . The
magnetic switch is connected to Central Box 310/320 by the
interconnection cable from normal Master port on the magnetic
switch to a slot labeled "SWITCH" on the Central Box 310/320. To
turn on the Central Box using the magnetic switch it is necessary to
hold the supplied magnet carrier (key) to the target so that the
carrier (key) and the target on the magnetic switch are properly
oriented (align the dots).
Green LED
- flashing LED signals proper detection of the magnet key
- steady LED signals “ON” state
When the magnet key is held to the target in the proper orientation,
the green LED glow steadily after 1 second indicating that the
electronic switch is turned “ON”.
Switching „OFF” is done in a similar manner, when the magnet key
is held to the target in the proper orientation, after 1 second, the
green LED goes off and the system switches off.
If the switch is not plugged in the Central Box, the Central Box is
switched “ON”.
The system remembers whether it has been switched “ON” or „OFF”.
If the system is switched “ON” via the magnetic switch and then the
power supply is disconnected, when the batteries are re-connected
to the system automatically returns to the “ON” state. For safety
Fig. 2: Description of magnetic switch and the key
Key
Target
Led On

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3.1 Power supply of Central Box 310/320
The Central Box 310/320 can only be powered from batteries
connected to BATT1 or BATT2. When selecting the power supply it
is necessary to follow the power requirements and the number of
the servos you use. Batteries for power supply must be sufficiently
large to prevent a decrease of the output voltage for servos when
loaded (voltage depression) and to allow the overload protection
function properly (Central Box 320).
Together, both power supply methods must be able to supply a 20A
continuous and 120A peak current. To take full advantage of
internal BEC we recommend to power the Central Box from three
Lixx cells.
The power batteries are connected to the Central Box using MPX
connectors. The Central Box allows up to two batteries to be
connected. If the voltage of the batteries is the same, the power can
be used from both batteries at the same time. This rule applies to
the standard power supply. This means that the power battery
voltage should be greater than the required BEC voltage setting.
When the voltage of the batteries is different, the power is not
shared and each pack is isolated from the other. This allows you to
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reasons, always switch the system off via magnetic switch before
disconnecting the power batteries.
When turning “ON”, connect the batteries first and then turn the
system on via magnetic switch. Keep the same rule when switching
off. First switch the system “OFF” via magnetic switch and then
disconnect the batteries.
3 Connection
The Central Box is connected to the power supply, receiver, servos,
controller/controllers and eventually sensors. Please follow the
subsequent general guidelines about proper connection of the
Central Box and these other components.

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safely use batteries of different capacity, number of cells, and
chemistry type. If the power for the Central Box is provided only
from one battery, it can be connected via either the BATT1 or BATT2
input.
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2
3
4
5
6
7
1
12
13
14
15
16
17
18
9
R1
R2
8
10
11
E4
E3 E2
18 channel protected servo interface
E1/R3
INPUT VOLTAGE 6-14V
LED1 LED2
320320320
RC Switch
Magnetic switch
Rsat2 (R1)
Rsat2 (R2)
Ext.
Ext.
SATELLITE RECEIVER
I
/
0
E
1
R 900 NGsat
Rsat 900 NG (R3)
E1/E2
SERVA
standard
SERVA
high-torque
Input
Voltage
BATT1
SERVA
standard
SERVA
high-torque
Input
Voltage
BATT2
Jetibox/Sensor
Sensor
Fig. 3: Example of the Central Box powered for use with HIGH Voltage
servos

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3.2 Overload protection of servos (Central Box 320)
The Central Box 320 has an overload protection circuit on every
servo output. In case of an overload, the affected servo output is
disconnected from the power supply while the remaining servo
outputs are still powered.
The Central Box 320 has 8 outputs for high-torque servos and 10
outputs for standard servos. Servo outputs for high-torque servos
use resettable fuses with the hold current 6A and trip current 12A
(20°C). The other servo outputs use resettable fuses with the hold
current 2.6A and trip current 5A (20°C). The hold current means the
maximum current which will pass without tripping in 20°C. The trip
current means the minimum current at which the fuse will trip in
20°C.
Be aware of the performance of the fuse is strongly temperature
dependent. If the ambient temperature is high (more than 50°C) we
recommend using the Central Box 310. The same recommendation
applies for the mechanical connection of the several servos.
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SERVO
SERVO
NO NO
SERVO
YES
SERVO
The voltage stabilization of individual power sources can be
deactivated. If the input battery voltage is lower than your settings,
or if there is the same voltage on the BEC and on the input battery,
then the voltage is not stabilized. For example if 6V are used and the
U BEC is set to 8.4V, the voltage of the power supply output is max.
6V, which is not stabilized.
Fig. 4: Correct connection of servos to the Central Box

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3.3 Connecting Central Box – EX Bus
Receivers can be connected to the Central Box 310/320 using the
R1, R2 and E1/R3 inputs.
Input E1/R3 it's necessary to set to a Receiver.
The serial link of the receivers (Ext.) has to be set to EX Bus.
Configuring the Central Box 310/320 is done directly in the
transmitter via EX Bus (Device Explorer).
When operating the Central Box 310/320 with DC/DS transmitter, it
is recommended to use two/three receivers communicating with
the transmitter in the wireless mode „Double path" and Enable 900
MHz Backup
The Central Box 310/320 can be configured in two ways:
-by JETIBOX connection (directly to the Central Box or wirelessly via
the transmitter)
- by DC/DS transmitter via Device Explorer (EX Bus)
„see. Pic5. "
It is not recommended:
- to connect more Central Box outputs to one servo
- to use a Y cable (connecting two servos to one output)
Caution:
R1, R2, E1/R3, E2, E3 and E4 are not protected against overload.
The maximum output current is 200mA for each output.
Do not connect anything to the receivers other than the patch
cable from the central box
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Central Box 320 generates an alarm if the temperature after the
start is higher than 50°C. It is not recommended to operates with
Central Box 320 while the initialization temperature is higher than
50°C. Otherwise, the performance of the fuses is degraded.

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2
3
4
5
6
7
1
12
13
14
15
16
17
18
9
R1
R2
8
10
11
E4
E3 E2
18 channel protected servo interface
E1/R3
INPUT VOLTAGE 6-14V
LED1 LED2
320320320
RC Switch
Magnetic switch
Rsat2 (R1)
Rsat2 (R2)
Ext.
Ext.
SATELLITE RECEIVER
I
/
0
E
1
R 900 NGsat
Rsat 900 NG (R3)
E1/E2
SERVA
standard
SERVA
high-torque
Input
Voltage
BATT1
SERVA
standard
SERVA
high-torque
Input
Voltage
BATT2
Jetibox/Sensor
Sensor
Fig. 5: Block diagram of Central Box 310/320 connection - EX Bus variant

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3.4 Alternative functions – digital input
Using the pin as an input is useful for simple feedback, without the
use of telemetry sensors.
For example: if you attach limit switches to retractable gear, you can
have feedback about its condition during the flight. The condition
of the digital inputs is sent via EX telemetry and the user can assign
sounds or alarms to the events.
Here the pin is configured as an input and its condition
(disconnected / connected to the ground) is sent to the transmitter
as other telemetry data from the sensors.
- Only keep the pin disconnected or connected to the common
ground of the Central Box.
- Never connect to a different voltage. The pin works exclusively in
Pull-up mode.
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1
Contact, end switch
+
Central Box
Typ.
40kW
Fig. 6 configuration of servo output pin as digital input

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3.5 Alternative functions – digital output
In the digital output mode, only the logical level 1 or 0 is generated
on the port configured this way. The value of this output is
reflecting the assigned output channel and its level. If the servo
position of the specified receiver channel is lower than 0%, i.e.
1.5ms (the decision limit point can be set by the user using the
„Trigger" parameter), the output is set to permanent log. 0 (i.e. 0V). If
the servo position is higher than 0%, log. 1 (i.e. 3.3V) will be
generated on the pin. In the digital output mode, no control servo
pulses are generated for that particular pin. With digital outputs,
the Central Box is even able to control devices that do not use servo
impulse as their input, e.g. lights, sound generators, etc. different
voltage. The pin works exclusively in Pull-up mode.
Fig. 7 configuration of servo output pin as digital output
Central Box
1
+Vcc
Log.1 – 3.3V
Log.0 - 0V
Imax=5mA
4.7kW
3.6 Installing safety mechanism of connectors
Vibrations in models powered mainly by gasoline engines can lead
to accidental disconnection of connectors. To prevent this
phenomenon, there is the possibility of installing a safety
mechanism to secure all the connectors. Protective elements can
be used to fix the JR connectors.
Screw the distance spacer to the holes on the front side of the
Central Box. Mount the elements to the spacers and tighten them
with M2.5 (torx 8) screws. All the screws are supplied with the safety
mechanism of connectors.

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4 Configuration via JETIBOX
After connecting to the Central Box 310/320 (output E4), a start-
up screen appears that contains identification of the device in the
first line of the JETIBOX display. The second line contains the data
showing the consumed capacity of batteries.
By pushing the R button (to the right) on the JETIBOX, you get to
the expander menu.
In the expander menu, the second lines display the sensors that are
connected to inputs E1/R3, E2, E3 and E4.
Using buttons U and D (down and up arrows) of the JETIBOX it is
possible to browse through the expander inputs. The selected
input is marked with a curly bracket brace after the input number,
eg. 1}. By pushing the R button (right arrow) it is possible to enter a
selected sensor, where you can adjust and display its parameters.
4.1 Actual values
*CENTRAL BOX*:
• NadProud Monitor (Output voltage) - i
• Actual Value – by pushing the D button (down arrow) you select
the display of actual measured values
• Accu voltage - shows the actual voltage of both inputs
• Accu current - displays the actual current flowing from the battery
to the output
• Accu capacity - consumed capacity of each battery
• Output voltage - Output voltage for servos (BEC output voltage)
• Over-I Monitor (CB320) - indication of servo output; (-) output is
fine (x) the output is overloaded.
Outputs are ordered:
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Fig. 8: Description of outputs
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4.2 Minimum / Maximum values
*CENTRAL BOX*: MIN / MAX – by pushing the D button
(downarrow) you select a display of extreme voltage, current,
temperature, and status of the receiver, which occurred during the
operation.
• Erase data – (CB310 and CB320) by pushing the arrows R and L
(right and left) together, the minimum and maximum are reset, see
"MIN / MAX - Minimum / Maximum".
• Minimal voltage – the lowest voltage detected by the
CentralBox on the inputs during its operations
• Maximal voltage – the highest voltage detected by the
CentralBox on the inputs during its operation
• Maximal current – the highest current detected by the
CentralBox on the inputs during its operation
• Min/Max Temper. - the highest and the lowest temperature of
the Central Box during its operation (since the last manual
reset)
Statistics of the received signal expressed in time
• R1: how long was the signal from the primary receiver available
to the Central Box
• R2: how long was the signal from the secondary receiver
available to the Central Box
• R3: how long was the signal from the third receiver available to
the Central Box 310/320
Statistics of the received signal expressed as a percentage
• R1: what percentage of the total operating time was the signal
from the primary receiver available to the Central Box
• R2: what percentage of the total operating time was the signal
from the secondary receiver available to the Central Box
• Temperature - actual temperature of Central Box
• Information on the status of receivers - number of detected
channels and the period of signal
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• R3: what percentage of the total operating time was the signal
from the third receiver available to the Central Box 310/320
• Over-I Monitor (CB320) - indication of servo output during the
operating time of the Central Box; (-) output is fine (x) the output
is overloaded
4.3 Setting
*CENTRAL BOX*: SETTING – By pushing the D button (down arrow)
you get to the basic setting of the device.
• Fail Safe – switches on/off of the Fail Safe function. If the Fail Safe
function is deactivated, there is no signal generated in any
Central Box outputs at the signal loss. If you activate the Fail Safe
function, you can also select how the Central Box responds at
the signal loss for each of the individual outputs (OUT off, hold,
fail safe).
• Signal Fault Delay – the length of time from when the Central
Box detects a signal loss to when the programmed Fail Safe
output is performed. During this time the last servo input is
held. After the selected time has elapsed, the Central Box
outputs behave according to setting for each specific output.
• Output Period – setting for the period of the output signals
(default Auto-synchronous mode with the transmitter). This
parameter significantly affects the behaviour of the servos. For
analogue servos the reaction (response) accelerates and the
power consumption is higher when the values for the output
period are lower. This can lead to vibration in some servos if the
values are set too low.
• Rx Switchover (CB 310/320)
- Timeout (150ms) – If the connection from the receiver is lost for
more than 150ms the Central Box switches to another active
receiver. This strategy was used in the previous versions of the
firmware.
- Timeout (80ms) – If the connection from the receiver is lost for
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more than 80ms the Central Box switches to another active
receiver.
- Mixing – The Central Box combines data from all active receiver
inputs and uses it for servos on the packet-by-packet basis. This
strategy is available only if receivers are connected to the
Central Box via EX Bus. Any other type of serial communication
is not supported. Mixing strategy is not suitable for a
combination of Assist receiver with standard receiver(s). It
could lead to inconsistent servo data if signal from the. We also
do not recommend this "strategy" with a 900MHz / 900MHz NG
backup receiver.
Please note that the switch over strategy for ports configured as EX
Bus output is kept the same as in the Timeout (150ms) mode.
4.4 Out Pin Set
*CENTRAL BOX*: Out Pin Set – pushing the D button (down arrow)
moves you to basic settings of particular outputs of the Central
Box.
• Set Channel/Ext – select whether the setting will apply to
outputs Y1-18 (channel) or Ext.
• Set Output pin -selection of the slot that will be used for the
following settings. In this menu the output deflection of the
selected output is displayed as a percentage. Y1 is the Central
Box output labelled 1, Y2 is the Central Box labelled 2, etc.
• Function – setup of alternative output functions. This function is
available only for these outputs:
• Y1 to Y18: Functions - Servo output, digital input, digital output
and Ditex
• E1/R3: Functions - Telemetry input, JETIBOX, EX Bus and receiver
• E2, E3 - Functions - telemetry input, EX Bus Expander – for
connecting devices supporting communication using the EX
Bus protocol, S.BUS output (only for E2)
• E4 - Functions - telemetry input, EX Bus Expander – for
connecting devices supporting communication using the EX
Bus protocol, JETIBOX
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