Specifications

10 Z-Family Techncial Reference Manual
Session Programming
The Session Programming feature allows you to pre-set up to 10 observation sessions
in the receiver. The receiver can then run unattended and will collect data on the data
card only during the times that have been preset. Once set, the sessions will collect
data during the preset session times every day. Or if desired, a session time offset can
be programmed in that will shift the session start and end times by a set amount every
day.
Session programming can also be used to put the receiver into sleep mode. When the
receiver is in sleep mode, most of the receiver functions are shut down which will
conserve power when data is not being collected. Using the session start times that
have been preset, the receiver will automatically wake up in time to collect data for
the next session and go back to sleep when the session is over.
Session programming is enabled by using either Receiver Communications Software
or the REMOTE.exe program, with either the <ALT-P> option, or else by sending the
$PASHS,SES commands through the serial port. Regardless of which method is used,
you will need to enable the individual sessions and set session parameters such as the
desired start/stop time, the recording interval, elevation mask, minimum number of
satellites, and the data type for each session to be recorded.
In addition, you will need to set the mode (session in use switch), the session
reference day, and any desired session offset. The mode is either Yes, No, or Sleep. If
the mode is NO, then session programming is not enabled, even if individual session
are set. If the mode is Yes, then session programming is enabled, and any enabled
individual sessions will be activated. If the mode is Sleep, then the receiver will go
into sleep mode once an activated session is completed, and will wake up just prior to
the next session.
The session reference day is a mandatory parameter that both determines the start day
of session programming data collection and is used in conjunction with the Offset to
determine the session start and end times. The reference day must be set to equal to or
earlier than the current day, or else the sessions will not run. If the reference day is
later than the current day, then the session start and end times will decrement by the
Offset multiplied by the numbers of days between the current day and the reference
day. For example, suppose you wish to collect data every day for 7 days observing the
identical satellite window on each day. Since the GPS window moves backwards 4
minutes per day, you would set the Offset to 0400 and set the reference day equal to
the current day. For each subsequent day of data collection, all sessions will start and
end 4 minutes earlier than the previous day. By the seventh day, the sessions will start
and end 28 minutes earlier than on day 1.