eRide
OPUS 6/
eRide
OPUS 7 GV-8620/ GV-8720
Dead Reckoning User
’
s Guide
SE16-900-002-02
15
FURUNO ELECTRIC CO., LTD. All rights reserved.
7 Operating of DR Backup
The DR receiver has two kinds of backup source, which are the backup RAM and the Flash ROM. The backup
data is stored into the backup RAM while a backup power is supplied to the DR receiver. The DR receiver can
also store the backup data into the Flash ROM by sending PERDAPI,STOP,DRPARK command.
When the backup data is valid at the next operating, the DR receiver outputs the position in DR only mode
based on the backup data until GNSS position fix. When the DR receiver receives GNSS signals and confirms
the GNSS positioning result is correct, the position fix status changes to DR/GNSS mixed mode.
When changing the vehicle, installation angle and installation position of IMU sensor, the backup data should
be deleted by sending PERDAPI,START,SIMCOLD command. And then, calibrate the IMU sensor parameters
again.
8 Recommended NMEA Output Sentence at Customer Evaluation Stage
When evaluating the DR performance, it is recommended to collect PERDCRD, PERDCRI sentences and
Diag data. It is very useful for analyzing the log data at FURUNO.
The recommended operating is as follow:
1. Send STOP command ($PERDAPI,STOP,DRPARK*5D).
2. Send output command ($PERDAPI,CROUT,DI*09) for output valid of PERDCRD and PERDCRI
sentence.
3. Send Diag data output command ($PERDSYS,RECPLAY,ON*0B).
4. Send START command ($PERDAPI,START*37).
Notes:
When outputting the Diag data, it is necessary to change the baud rate to 460800 bps by the following
command.
$PERDCFG,UART1,460800*68
In case of using 460800 bps, taka care about UART communication error rate and do not use this baud rate
except Diag data collection.
