User's Manual

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 fi 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 fi 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.
4.1. 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.
4.2. Update procedure
Ensure that the adapter lead is confi gured as shown in the illustrations, and is connected correctly to
the transmitter or receiver.
Start the Graupner Firmware Update Utility.
Under [COM Port Setup] select the correct COM port, i.e. the
one to which the USB lead is connected. If you are not sure of
this, press the button „Search“ and select in the pop-up window
„Silicon Labs CP210x USB to UART Bridge“ and press „OK“.
Baud Rate: 19200.
Under [Interface Type] click on Signal 2:Vcc3:Gnd.
Now click on the “Browse” button and select the folder con-
taining the previously loaded fi rmware fi le ending in *.bin. If
everything is correct, the fi le will appear in the corresponding
window.
The fi rmware fi les are encoded in product-specifi c form, i.e. if
you accidentally select a fi le which does not match the product
(e.g. transmitter update fi le instead of receiver fi le), then the pop-up window “Product code error” will
appear, and you will not be able to start the update procedure.
03 Manual Receiver GR-32 Graupner HoTT 2.4