CLD
indicates a complete system restart; neither the internal real time clock setting nor
the programmed parameter values were valid. This usually occurs only in instruments
which are brand new or which have been reprogrammed or reconfigured, and is not
normally seen outside the RBR factory.
TTY
indicates a serious failure of communication with the host, in which the logger was
unable to send data over the serial connection because of an internal problem, although
it may be able to recover later. This is very rare.
SER
can occur only in an XR-420 or XR-620, and indicates a serious failure of
communication between the CPU and one or more of the internal sensor modules.
Again, the logger may be able to recover subsequently, and the fault is very rare.
November 5, 2010
Rev1.4
57