GRAUPNER HoTT SMART-BOX Manual page 14

conditions (ideally between 10 and 55°C; please refer to your RC system instructions). If the temperature
rises above maximum or falls below minimum an audible signal is emitted (continuous beeping)
Channel- (CH OUTPUT TYPE): at this point you can select how the receiver signals are sent to the out-
puts.
ONCE: the receiver outputs are transmitted in sequence: recommended for analogue servos. This setting
ensures that the servos are automatically operated using a 20 msec cycle - 30 msec in the case of the
twelve-channel receiver (Order No. 33512) - regardless of the value set and displayed in the RX SERVO
display under the menu point 'PERIOD'.
SAME: the receiver outputs are transmitted in parallel blocks up to seven (GR-32 or up to four for GR-
12/16/24), i.e. channels 1 to 7 and channels 8 to 16 receive the transmitter signal simultaneously in each
case: recommended for digital servos. It is particularly useful where multiple servos are used for a particular
function (e.g. ailerons), so that all the servos move absolutely synchronously.
It is also possible to connect analogue servos; in this case you must set 20 ms in the menu point 'PERIOD'
in the RX SERVO display.
Note: if you select the SAME setting, it is especially important to install a high-capacity receiver power
supply system, as up to seven servos are almost always working simultaneously, placing a greater load on
the battery.
SUMI (Sum signal Input): Input for satellite receiver
SUMO (Sum signal output): the receiver outputs are transmitted in sequence, whereby the highest channel
transmits the sum signal; this signal is required by certain optional devices. With this setting the servos are
automatically operated using a 20 msec cycle - 30 msec in the case of the twelve-channel receiver (Order
No. 33512) - regardless of the value set and shown in the menu point 'PERIOD' of the RX SERVO display.
When you select SUMO, the inverse marker moves to the number of channels to be transmitted; this can be
programmed between four and sixteen channels, depending on the receiver in use. As standard the number
coincides with the number of channels of the receiver connected to the system.
Ex: V-Stabiliser, teacher-student system, Microbeast, fl ight simulator and output satellite receiver
SUMD (Sum Signal Digital): transmits the channel data in digital form. Serial transmission takes place at
115200 Baud, with a high-speed signal update rate of 10 ms. All fail-safe modes (OFF, Fail-safe and Hold)
are also available. When you select SUMD the inverse marker moves to the fail-safe modes (OF = Fail-safe
OFF, FS = Fail-safe POSITION, or HD = HOLD), and after this to the number of channels to be transmitted,
which can be programmed between four and sixteen channels, depending on the number of channels of
the receiver you are using.
This is important in relation to optional devices which require this signal, such as VStabi 5.3 fl ybarless sys-
tems, the MicroBeast or the PowerBox Competition.
SATELLITE MODE
Two HoTT receivers are inter-connected using a three-core connecting lead (Order No. 33700.1 (300 mm)
or 33700.2 (100 mm) by the highest-numbered servo sockets. For more details on this please visit www.
graupner.de on the Internet.
The HoTT receiver which is confi gured as SUMO (see below) is designated the satellite receiver, and all its
channels are transmitted in the form of a sum signal to the second HoTT receiver - the primary receiver - if
reception should fail; the primary receiver must be programmed as "SUMI". Note that the signal only ever
moves towards SUMI.
The receiver outputs are addressed in sequence at a frame rate of 20 ms (30 ms with the GR-24 receiver,
Order No. 33512), even if you have set 10 ms in the "PERIOD" line of the "RX SERVO" screen page.
However, if the receiver programmed as the satellite (SUMO) suffers signal reception failure, the servos
connected to that receiver take up the Fail-Safe positions programmed in the satellite receiver, regardless
of the primary receiver.
This receiver confi guration is recommended in particular circumstances: for example, if one of the two re-
13
33700 SMART-BOX - Graupner HoTT 2.4