User's Manual

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100

Using the receiver for the ﬁ rst time

Firmware updates for the receiver are carried out using

the receiver’s telemetry socket - in the case of the GR-

12 receiver supplied as standard in the set this is servo

socket 5, which is also marked with a “T” - in conjunction

with a PC running Windows XP, Vista or 7. To connect

the receiver to a PC you require the separately available

USB interface, No. 7168.6 and the adapter lead, Order

No. 7168.6A. The latter - like all other connecting leads

- must always be connected to the GR-12 receiver with

the brown or black wire facing up.

The latest software and information can be found in the

Download area for the corresponding product at www.

graupner.de.

Note:

Once you have registered your transmitter at http://

graupner.de/de/service/produktregistrierung you will

automatically be informed of new updates by e-mail as

they become available.

Updating the GR-12 software

Attention:

It is essential to check the state of charge of your

receiver battery before carrying out any update. To

be on the safe side we recommend that you give the

battery a full charge.

1. Installing the driver

If you have not already done so, install the driver

software for the USB interface, Order No. 7168.6, as

described on page 89.

2. Connecting the receiver to the PC

Connect the USB interface, Order No. 7168.6 to the

receiver socket marked “-+T” using the adapter lead,

Receiver ﬁ rmware update

Order No. 7168.6A. The connectors are polarised:

look for the small chamfer on the side. The connec

tors should engage easily; on no account use force.

Then connect the USB interface with the USB cable

(PC-USB/mini-USB) to your PC or laptop. With pro-

per connection the red LED on the interface board lit

up for a few seconds. Now turn off the power supply

of your receiver.

3. Firmware Update Utility

Start the program “Firmware_Upgrade_grStudio_

Ver-SX.X.exe” from the appropriate folder by a

double-click. (The at the time of printing this manual

current version 1.3 starts without prior installation.):

Select “Port Setup” under “Menu”; alternatively open

the “Controller Menu” and click on “Port select”:

In the “Port select” window you can now select the

correct COM port, i.e. the one to which the USB in-

terface is connected. This can be identiﬁ ed by the

name “Silicon Labs CP210x USB to UART Bridge” in

the “Device Name” column; in the screen-shot above

this would be the “COM 3” port.

Now call up the “HoTT Receiver Upgrade option un-

der “Menu”, open the “Controller Menu” and click on

“HoTT Receiver”:

Adapter cable

Order No. 7168.6A

if present:

cut the central red braid

115

Program description: Telemetry menu

Country selection (COUNTRY)

The Country setting is present in order to cater for vari-

ous directives (FCC, ETSI, IC etc.). The HoTT 2.4 radio

system features a restricted frequency band for France.

If you wish to use the RC system in France, the country

setting on the transmitter must be set to “France” mode,

as described. It is essential not to use the Universal/

EUROPE mode. Factory setting is GENERAL.

Range checking (RANGE TEST)

switches the range test on or off, the remaining time is

displayed. The display also works if the range check

is started with the BIND / RANGE button on the trans-

mitter.

RX DATAVIEW

… you cannot enter any settings. This page is for infor-

mation purposes only:

RX DATAVIEW

S–STR100% R–TEM.+28°C

L PACK TIME 00010msec

R-VOLT :05.0V

L.R-VOLT:04.5V

S–QUA100%S–dBM–030dBM

SENSOR1 :00.0V 00°C

SENSOR2 :00.0V 00°C

Value Explanation

S-QUA Signal quality in %

S-dBm Receive performance in dBm

S-STR Signal strength in %

R-TEM. Receiver temperature in °C

L PACK TIME Indicates the time in ms for which

the longest data packet was lost in

transmission between transmitter and

receiver

R-VOLT Current receiver operating voltage, in

Volt

Signal quality (S-QUA)

The signal quality (S-QUA) is sent “live” to the transmit-

ter via the receiver’s downlink channel, and shows the

signal strength in %.

Receive performance (S-dBm)

The receive performance (S-dBm) is displayed as a ne-

gative value, i. e. a value approaching zero is the highest

value (= best reception). The lower the value falls, the

worse is the receive performance. This is an important

item of information, particularly when you are carrying

out a range-check before operating the model.

Note:

In the case of negative numbers the value is reversed:

the higher the number following the minus sign, the

lower the value.

Carry out a range-check as described on pages 62 and

71 before every ﬂ ight, and remember to simulate all the

servo movements which are likely to occur in the air.

In active range-check mode the range must be at least

ﬁ fty metres on the ground. To guarantee safe operation

of your model, a value no higher than -80 dBm must be

displayed in the “RX DATA” display under “S-dBm” at this

distance. If the value falls below this (e. g. -85 dBm), you

should under no circumstances ﬂ y your model. Instead

check the receiving system installation and the aerial

positions.

When operating a model this value should not fall below

-90 dBm; if it does, reduce the distance between the

pilot and the model. However, the audible range war-

ning (beeping at one-second intervals) will normally be

triggered before this value is reached, in order to ensure

safe operation.

Signal strength (S-STR)

The value for signal strength (S-STR) is displayed in %.

An audible range warning (beeping at one-second inter-

vals) will always be generated as soon as the receiver

signal in the downlink channel is too weak. However,

since the transmitter has a much higher transmitting

power than the receiver, the model can still be operated

safely at this point. Nevertheless, in the interests of

safety the distance to the model should be reduced until

the audible warning ceases.

Receiver temperature (R-TEM.)

Ensure under all ﬂ ight conditions that the receiver stays

within its speciﬁ ed temperature range (ideally between

-10 and +55°C).

The limit values for receiver temperature after which

a warning occurs can be set in the “SERVO TEST”

sub-menu under “ALARM TEMP+” (50 … 80°C) and

“ALARM TEMP-” (-20 … +10°C). If the temperature

exceeds or falls below the set limit, an audible signal

(continuous beeping) is triggered, and “

TEMP.E” is

displa

yed at top right in all the “RX” receiver sub-menus.

At the same time the “R-TEM“ parameter is highlighted

on the “RX DATAVIEW” screen page.

Data packets (L PACK TIME)

This displays the longest period in ms in which data

packets were lost in transmission from the transmitter to

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21.10.2011 13:25:40