NavCom Sapphire Rev.J User Manual

Page 147

Sapphire Technical Reference Manual Rev. J

147

10. USBMODE]HOST to set the USB to host mode, and then attach a thumb drive.

11. Use the [OUTPUT] command to schedule messages to be logged on drive A or B (e.g.,

[OUTPUT]PVT1B,ONTIME,1,FH1 schedules 1 Hz PVT1B messages to be logged on
drive A and [OUTPUT]PVT1B,ONTIME,1,FH2 schedules 1 Hz PVT1B messages to be
logged on drive B).

12. Logging data using the [LOGFILE] command requires at least 1 Mbyte free space;

logging stops when free space drops below 1 Mbyte.

13. When the USB is not in Host mode and the user sends the command

[LOGFILE]B:,START, logging will not be started and the following message is output:

[LOGFILE]REQUEST DENIED

– USB IS NOT IN HOST MODE

14. Logic

is implemented to detect if the logging file was not properly closed: When the user

sends the command [LOGFILE]A:,START, a CHKDSK.SD file is created in the root
directory of the SD flash or the SD card, and a PASS signature is identified with this file.
This CHKDSK.SD is then deleted and replaced with another CHKDSK.SD file, to which
a PENDING signature is written. If a CHKDSK.SD file cannot be found or the PASS
signature cannot be found, the first CHKDSK.SD file is not deleted and a new file with
PENDING written to it cannot be created. In this case, file logging cannot start, and the
receiver outputs the following message:

For Sapphire: [LOGFILE]A: POTENTIAL SD FLASH CORRUPTION, PLEASE CHECK
DISK

For the SF-3040: [LOGFILE]A: POTENTIAL SD CARD CORRUPTION, PLEASE
CHECK DISK

1.98 If the above scenario occurs, connect the receiver to a PC using a USB

device cable and use the [UPTIME

This command is used to retrieve the total time the receiver has been running since boot up OR
since the last time the user rest the timer.

RESET will reset the start time to the current time, so that the user can use this as a
counter from a specific point in time.

If the RESET parameter is not specified, the command will return the total time the receiver
has been running or since the last time the time has been reset.