POS MV V5 Installation and Operation Guide
System
Operation
5-10
Figure 44: POSView Message Log
POS MV uses AutoRecovery and Fault Detection, Isolation and Reconfiguration (FDIR) to assist in its
recovery from fault conditions. AutoRecovery helps POS MV to recover from a communications failure
between the PCS and the IMU, and provides alerts for any problems in this area. Investigate persistent
communication failures with the IMU, the most likely cause being a faulty data cable or connector. Never
open the IMU; if you suspect the IMU is faulty, contact Applanix for return instructions. Refer to Technical
Support and Service on page A-1 for procedures.
POS MV monitors its sensing subsystems continuously and determines which of them, if any, shows
degraded performance. FDIR allows POS MV to combine data from the GNSS and IMU to offer the best
navigation solution for the current data quality.
For more information on AutoRecovery and FDIR refer to page 1-11.
Data Logging
POS MV real-time and raw data may be recorded on storage media for post-processing. Typically, the
data are recorded on removable media, a USB flash drive using the USB connector installed in the front
of the POS Computer System (PCS). Alternately, the data may be transferred across the Ethernet Data
Port to a disk file on an external PC. The USB flash drive is useable for post-processing in any PC with a
USB connector.
Note:
Use of the removable media interface is preferred due to the bandwidth limitations associated with
some Ethernet installations.
Most PCSs contain a USB connector and an internal memory device, both dedicated to data logging. The
system includes a 8GB industrial grade USB flash drive which is inserted into a USB connector behind a
door on the front of the PCS; see Figure 47, page 5-12 for MV V5 and Figure 48, page 5-13 for MV V5-1.
A 4 GB internal memory device functions as a circular buffer and is used to back-up the last data logging
file. Back-up logging is automatic and does not require any user maintenance. Once the user begins
removable media logging, back-up logging will log the same data and continues to back-up the data until
the system is reset or powered-off. In the case of POS MV V5-2 there is no USB connector for
removeable media so the internal memory is configured to act as the primary logging device instead of
performing the back-up logging function. The data selection, start and stop logging control and log file
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