Bosch VCU - Page 87

Recording | 14
Bosch Motorsport Vehicle_Control_Unit_VCU_Manual 87/136
NOTICE
For more detailed descriptions and instructions refer to the Win-
Darab V7 manual.
14.3.2 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 Vehicle Control Unit VCU 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 Vehicle Control Unit
VCU is powered up, the Vehicle Control Unit VCU still records data.
If the USB device is unplugged and re-inserted for > 4 s while the Vehicle Control Unit
VCU is powered up or a different USB device is plugged in, the Vehicle Control Unit VCU
restarts. In this case, the Vehicle Control Unit VCU is not operational for 1.5 s.
14.3.3 Troubleshooting
When no data on the USB device is recorded:
Configure the measurement label usb_mediastate on a RaceCon measurement view or
on a Vehicle Control Unit VCU 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 Vehicle Control Unit VCU 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.