User's Manual
3. RECEIVER
3.1 Connections
Connect the servos to the row of sockets on one end of the receiver. The connectors are polarised: note
the small chamfers on one side. Never use force - the connectors should engage easily. The polarity is
also printed on the receiver; the negative wire (-) is brown, the positive (+) red and the signal orange.
The servo sockets of Graupner/SJ HoTT 2.4 receivers are numbered sequentially.
The socket for channel 6 can also be programmed to deliver a (digital) sum signal (see section 3.2:
Receiver set-up).
I²C (Inter-Integrated Circuit) - socket currently not active; for servicing purposes only!
Power supply
The receiver does not feature specic sockets for connecting the battery. We recommend that you
connect the power supply to the socket(s) close to the servos already connected to the receiver. If you
wish to connect multiple separate batteries, the batteries must be of the same nominal voltage and
capacity. Never connect batteries of different type, or packs of greatly differing states of charge, as this
can cause effects similar to a short-circuit. If you encounter this problem, we recommend the use of a
voltage stabiliser unit (e.g. PRX-5A receiver power supply, Order No. 4136) between the batteries and
the receiver.
Telemetry
The optional telemetry sensors are connected to the socket marked “T” (Telemetry). Alternatively the
receiver can monitor a voltage up to max. 25.5 V DC via this socket, which is also used to update the
receiver’s rmware with the help of the USB interface.
NOTE: you can either connect this socket to a servo or a telemetry sensor or the battery to be monitored;
the receiver must be set up accordingly. Please see the following section for further details.
WARNING: never connect a battery with a voltage higher than 8.4 V DC directly to the receiver,
as this would instantly ruin the unit and any servos or other accessories connected to it.
Caution! If you activate voltage measurement, the receiver can monitor a voltage of up to
max. 25.5 V DC via this input, but only if the circuit shown below is used. Never connect a
battery to the Telemetry socket without this circuit!
OK
max. 25,5 V DC
← Channel 5
6
Manual Receiver GR-12+ 3xG Graupner HoTT 2. 4