126
en | Recording and Telemetry
Display Unit DDU 7
04.02.2019 | V 02 |
Manual
Bosch Motorsport
13.4.2
USB device handling hints
Using the USB device
Always plug the USB device into vehicle before power up to ensure that all measurement data
is stored on the USB device.
If the USB device is plugged in after recording has started, only the current data is saved.
Data recorded on the DDU 7 before the USB device is plugged in will not be saved.
Removing the USB device
Always power off the system before unplugging the USB device!
If the USB device is unplugged while recording is active, parts of the measurement data may
be missing.
If the USB device is unplugged and re-inserted for < 4 s while the DDU 7 is powered up, the
DDU 7 still records data.
If the USB device is unplugged and re-inserted for > 4 s while the DDU 7 is powered up or a
different USB device is plugged in, the DDU 7 restarts. In this case, the DDU 7 is not
operational for 1.5 s.
13.4.3
Troubleshooting
When no data on the USB device is recorded:
Configure the measurement label
usb_mediastate
on a RaceCon measurement view or on a
DDU 7 display page.
The value of
usb_mediastate
reflects the operating condition of the USB bus:
State
Description
0: Wait: Device not found
The USB device is not found (also: waiting for re-plug stick).
No USB device inserted.
USB device is defect.
No electrical connection or wiring harness problem.
USB software upgrade not activated (Purchase of unlock code
needed).
1: Wait: Device detected
An USB device is found, but not yet installed.
2: Ok: Media installed
The USB device is found and is operational (idle).
This does not imply that recording data is written!
3: Stop: Device unplugged The USB device has been removed.
The DDU 7 performs a restart when an USB device is re-plugged
in.
4: Ok: Media access
Data is currently read from/written to the USB device.
5: Error: Media error
The communication to the USB device broke down.
The USB device is defect.
The USB device is not supported by DDU 7.
6: Error: Media corrupt
The USB device is not in valid BFS format.
(Hint: Re-format the USB device in RaceCon.)
Summary of Contents for DDU 7
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