CQR Log (RF Link)

The CQR log contains information about the quality of communication each time an RFBase is dialed. (Note that information on an RFBase-TD link is not contained in the CQR log). The CQR log is written to the <working directory>\Logs directory. By default, this is C:\Campbellsci\LoggerNet\Logs.

Each time an RF link is shutdown, an entry will be written to the CQR Log. The first line in each entry is the timestamp and the name of the datalogger being communicated with. The remaining lines are the RF Link Quality Accumulators (RLQA) for each modem in the link. The RLQA are representative of the active period of the link. The line for each modem will contain three numbers:

xxxx yyyy zzzz

where

xxxx = Number of communication failures
yyyy = Noise Level Indicator
zzzz = Noise Level Indicator

A communication failure occurs when a signature of a block of data does not match its original signature. These blocks are subsequently retransmitted. The noise level indicators should be 102 (±70) at 3.0K baud rate or 124 (±70) at 2.4K baud.

Example CQR log entry

“10/14/2010 12:10:35”,CR10XTD
0002 0128 0055
0000 0129 0063

The first line is the timestamp and name of the datalogger being communicated with. The next line is the RLQA for the EOL (End of Link) modem. This is the remote modem connected to the datalogger. The last line is the RLQA for the SOL (Start of Link) modem. This is the base modem. (This entry is for a link that contains no repeaters. A link with repeaters would show an additional line for each repeater between the EOL line and the SOL line.) The 0002 indicates that two interruptions occurred on the EOL modem while the link was active. All noise level indicators are within acceptable bounds in this example.