Troubleshooting - Bosch DDU 8 Manual

13 | Recording and Telemetry
13.5.1.2
13.5.2
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If the USB device is unplugged and re‐inserted for > 4 s while the DDU 8 is pow‐
ered up or a different USB device is plugged in, the DDU 8 restarts. In this case,
the DDU 8 is not operational for 1.5 s.

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 8 display page.
The value of usb_mediastate reflects the operating condition of the USB bus:
State
0: Wait: Device not
found
1: Wait: Device detec‐
ted
2: Ok: Media installed
3: Stop: Device unplug‐
ged
4: Ok: Media access
5: Error: Media error
6: Error: Media corrupt The USB device is not in valid BFS format.
USB device handling hints
Using the USB device
Always plug the USB device into vehicle before power up to ensure that all meas‐
urement data is stored on the USB device.
If the USB device is plugged in after recording has started, the existing recording
is saved.
Data recorded on the DDU 8 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!
DDU 8 Manual
Description
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 un‐
lock code needed).
An USB device is found, but not yet installed.
The USB device is found and is operational (idle).
This does not imply that recording data is written!
The USB device has been removed.
The DDU 8 performs a restart when an USB device is re‐
plugged in.
Data is currently read from/written to the USB device.
The communication to the USB device broke down.
The USB device is defect.
The USB device is not supported by DDU 8.
(Hint: Re‐format the USB device in RaceCon.)
Bosch Motorsport