GRAUPNER HOTT GR-32 User Manual
Manual
33516 Receiver GR-32 HoTT
CONTENTS:
1. General Note .............................................................................................................. 01
2. Functions .................................................................................................................... 01
2.1. Binding ......................................................................................................................... 01
2.2. Binding Multiple Receivers .......................................................................................... 01
2.3. Fail-Safe Function ........................................................................................................ 02
3. Receiver ...................................................................................................................... 02
3.1. Connections ................................................................................................................. 02
3.2. Low Voltage Warning ................................................................................................... 03
3.3. Temperature Warning ..................................................................................................03
4. Firmware Update ........................................................................................................ 03
4.1. Receiver ......................................................................................................................03
4.2. Update Procedure ........................................................................................................ 03
5. Declaration of Conformity ......................................................................................... 05
6. FCC Information..........................................................................................................06
7. Warranty .....................................................................................................................08
Manual V1.2
Revision: Oktober 2013
GRAUPNER/SJ GmbH – Postfach 1242 – 73230 Kirchheim/Teck – www.graupner.de
Thank you for purchasing the Graupner HoTT 2.4 System Please read through this entire manual before
you attempt the installation and usage of your Graupner HoTT 2.4 System!
A hardware antenna diversity system always switches to the better antenna signal and for transmission
always uses the antenna that was last used for receiving. This ensures that the back channel data
are always sent via the better-positioned antenna. Without additional sensor systems, the parameters
receiver voltage and temperature, as well as signal strength are transmitted. Connector for one telemetry sensor and for the sum signal input or output. The receiver does have 6 power inputs for strong
servos.
These operating instructions are part of this product. They contains important notes to the operation and
handling. Please take this into consideration when you pass on the product to third parties. Neglect of
the operating instructions and the safety instructions lead to expiring the warranty.
Graupner/SJ constantly work on the advancement of all remote control systems; changes of the scope of
delivery in form, technology and equipment we must reserve ourselves therefore. Please have understanding for the fact that from data and illustrations of this operating instructions no requirements can be derived.
Please keep these instructions for further reference!
1. GENERAL NOTE
When switching on or adjusting the radio control system it is essential to keep the transmitter aerial at
least 15 cm away from the receiver aerials at all times. If the transmitter aerial is too close to the receiver
aerials, the receiver will be overloaded, causing the green LED starts ashing. The transmitter responds
by emitting a beep once every second; the red LED also goes out. The radio control system is now in
Fail-Safe mode.
If this should occur, simply increase the distance between the aerials until the audible warning signal
ceases, and the red LED on the transmitter lights up again; at the same time the green LED on the
receiver should glow constantly.
2. FUNCTIONS
2.1. Binding
When you wish to use the Graupner HoTT 2.4 GHz receiver with a particular transmitter, the rst step
must always be to “bind” the unit to “its” Graupner HoTT 2.4 GHz RF module (transmitter). This “binding”
procedure only needs to be carried out once for each combination of receiver and RF module. The units
supplied in the set are already bound to each other at the factory, i.e. the binding procedure described in
the following section only needs to be carried out when you wish to use an additional receiver. However,
it can also be repeated at any time if required, e.g. after changing transmitters. When binding is required,
this is the procedure:
• Switch the transmitter and receiver on.
• Locate the BIND / RANGE button on the back of the transmitter, and hold it pressed in while you
press and hold the SET button on the receiver. Both LEDs on the back of the transmitter now glow
constantly, and the red LED on the receiver ashes.
• If the red LED expires and the green LED on the receiver begins to glow permanently within about
ten seconds, this indicates that the binding process is complete. You can now release both buttons,
and your transmitter / receiver combination is ready for use.
• However, if the green LED on the receiver continues to ash for longer than ten seconds, then the
binding process has failed. If this should occur, repeat the whole procedure.
2.2. Binding“ multiple receivers in one model
If required, it is also possible to bind multiple receivers to the transmitter for a particular model. The rst
step is to bind each receiver individually using the procedure already described.
When the system is in use, the receiver which was bound last is the Master receiver (which is switched
01 Manual Receiver GR-32 Graupner HoTT 2.4
on rst for the modules Order No. 33300, 33301 and 33302). Any telemetry sensors installed in the
model must be connected to this unit, as only the Master receiver transmits sensor
data using the downlink channel. The second and all further receivers operate in parallel with the Master
receiver but in Slave mode, with the downlink channel switched off.
The control functions can also be distributed amongst multiple receivers; this is carried out using the
Channel Mapping function of the SMART-BOX (Order No. 33700). In the same way it is possible to assign one control function to multiple receiver outputs; a typical example would be the use of two servos
for each aileron instead of only one, etc.
2.3. Fail-Safe function
In its default state (as delivered) the receiver is set to “Hold” mode, i.e. if a fail-safe situation occurs, all
the servos connected to it maintain the last position detected as valid. In this mode the green LED on
the receiver starts ashing when interference occurs, and the red LED on the transmitter goes out. The
transmitter also starts beeping about once per second as an audible warning.
You can exploit the safety potential of the fail-safe option by at least programming the throttle channel to
respond to a fail-safe situation: the throttle channel of an engine-powered model should be set to idle,
the throttle channel of an electric-powered model to “stop”, and the throttle channel of a model helicopter
to “Hold”. If interference should occur, these settings will help prevent the model ying out of control,
possibly causing personal injury or property damage.
Please refer to the appropriate section in your RC system instructions for the procedure.
3. RECEIVER
Battery socket „B“
Servo sockets
7-12/15-16
Battery socket „B“
Socket for
sum signal „S“
Battery socket „B“
Servo sockets
1-6/13-14
Battery socket „B“
3.1 Connections
Plug the servos into the row of sockets on both sides of the receiver. The connector system is polarised;
note the small chamfer on one edge. Never use force - the plugs should engage easily and fully. The
socket polarity is also marked on the case: brown wire (-), red (+) and orange (signal).
The servo sockets of the Graupner-HoTT 2.4 receiver are numbered. It is also possible to program
socket „S“ for the sum signal using the SMART-BOX (Order No. 33700). This is important for certain
optional devices which require this signal.
Power supply
The sockets marked “- +/B” are intended only for the battery connection. Connect the power supply
preferably with the socket(s) that are close to the servos. When using High Power servos you may use
all battery connectors depending on the battery power, when necessary with three PRX-receiver power
supplies.
If you connect to each battery terminal a separate battery, make sure that the batteries have the same
rated voltage and rated capacity. Do not connect different types of batteries or batteries with highly different charging states, because this may lead to short-circuit-like effects. Use in such cases, for safety
reasons, voltage stabilizers like the PRX-5A-receiver power supplies (No. 4136) between the battery
and receiver.
Manual Receiver GR-32 Graupner HoTT 2.4 02
Telemetry
Telemetry socket
(socket „T“)
3.2. Low voltage warning
If the receiver voltage falls below 3.8 V, the transmitter’s RF module generates a low voltage warning in
the form of a “general alarm sound”: a steady beeping at intervals of about one second.
3.3. Temperature warning
If the receiver temperature falls below -10° C or exceeds +70° C, the transmitter’s RF module generates
a temperature warning in the form of a “general alarm sound”: a steady beeping at intervals of about
one second.
4. FIRMWARE UPDATE
Firmware updates for the receiver can be transferred via the socket „T“ in conjunction with a PC running
Windows XP, Vista or 7. For this you also require the USB interface, Order No. 7168.6, and the adapter
lead, Order No. 7168.6A, which are available separately.
The programs and les required for this are available from www.graupner.de in the Download area for
the corresponding products.
Install the Firmware Update Utility Graupner and the USB drivers on your computer. Check the system
requirements!
The rst step is to cut through the central red wire in the adapter lead,
Order No. 7168.6A, then connect the lead to the USB interface, Order
No. 7168.6. This socket is also polarised; note the small chamfer on one
edge. Never use force - the plug should engage easily and fully.
The socket marked “T” is intended for the optional telemetry sensors and is used for loading rmware updates in conjunction with the USB interface.
4.1. Receiver
4.2. Update procedure
Ensure that the adapter lead is congured as shown in the illustrations, and is connected correctly to
the transmitter or receiver.
Connect the adapter lead to the socket „T“ of the receiver, as shown in the
illustration. This socket is also polarised; note the small chamfer on one
edge. Never use force - the plug should engage easily and fully.
Start the Firmware Upgrade Graupner Studio.
Under „Port Select“ select the correct COM port „Silicon Labs
CP210x USB to UART Bridge“, i.e. the one to which the USB
lead is connected.
Choose the „HoTT receiver update“ menu. Now click on the
“File Browse” button and select the the previously loaded rmware le ending in *.bin. If everything is correct, the le will
03 Manual Receiver GR-32 Graupner HoTT 2.4
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