Novatel GNSS Receiver and Antenna SMART-AG - Manual (Page 71)

SMART-AG User Manual Rev 5 71
B.4 LOG Request Logs from the Receiver
Many different types of data can be logged using several different methods of triggering the log
events. Every log element can be directed to any combination of the three COM ports. The ONTIME
trigger option requires the addition of the period parameter. See the OEMV Family Firmware
Reference Manual for further information and a complete list of data log structures. The LOG
command tables in this section show the ASCII command format.
The optional parameter [hold] prevents a log from being removed when the UNLOGALL command,
with its defaults, is issued. To remove a log which was invoked using the [hold] parameter requires the
specific use of the UNLOG command. To remove all logs that have the [hold] parameter, use the
UNLOGALL command with the held field set to 1.
The [port] parameter is optional. If [port] is not specified, [port] is defaulted to the port that the
command was received on.
 1. The OEMV family of receivers can handle 30 logs at a time. If you attempt to
log more than 30 logs at a time, the receiver responds with an Insufficient
Resources error. Each COM port (serial and USB) already has
RXSTATUSEVENT log associated with it. This means that with 3 serial ports
and no USB ports, 7 logs are already accounted for, as shown below:
• RXSTATUSEVENT on COM1, COM2, and COM3
• TRACKSTAT, BESTVEL, TILTDATA and PSRXYZ on XCOM1
See the example on the next page.
2. Maximum flexibility for logging data is provided to the user by these logs. The
user is cautioned, however, to recognize that each log requested requires addi-
tional CPU time and memory buffer space. Too many logs may result in lost
data and degraded CPU performance. Receiver overload can be monitored using
the idle-time field and buffer overload bits of the Receiver Status in any log
header.
3. Polled log types do not allow fractional offsets or ONTIME rates faster than
1Hz.
4. Use the ONNEW trigger with the MARKTIME, MARK2TIME, MARKPOS or
MARK2POS logs.
5. Only the MARKPOS, MARK2POS, MARKTIME or MARK2TIME logs, and
‘polled’ log types are generated ‘on the fly’ at the exact time of the mark. Syn-
chronous and asynchronous logs output the most recently available data.
6. If you do use the ONTIME trigger with asynchronous logs, the time stamp in
the log does not necessarily represent the time the data was generated, but rather
the time when the log is being transmitted.