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The <state > settings are:
ON - enables the battery; memory is non-volatile.
OFF - disables the battery; memory is lost when power is cycled
(factory setting).
If memory is to be battery-backed, the battery must be enabled before
readings are taken.
Cycling power or resetting the digitizer does not affect the battery state set
by MEMory:BATTery:STATe. Battery life is normally four years if it
remains enabled. Battery life can be extended to approximately seven years
if it is disabled when non-volatile memory is not required.
Determining the
Battery Charge
To ensure that the battery has sufficient charge to maintain memory, the
command:
MEMory:BATTery:CHARge?
can be sent. This command returns a ’1’ if the battery has sufficient charge
to maintain memory. If the battery does not have sufficient charge, a ’0’ is
returned. Leaving the digitizer in the VXI mainframe with the power on will
not recharge the battery. A battery with insufficient charge must be
replaced.
Digitizer Data
Formats
There are three digitizer data formats available when readings are taken
using MEASure or READ?, or when the readings are FETCh(ed)? from
memory. These formats are set using the FORMat subsystem which consists
of the command:
FORMat[:DATA] <
type
> [,<
length
>]
The formats available are:
<type > <length >
ASCii 9
PACKed 16
REAL 64
ASCii,9 format returns/retrieves data as comma (,) separated ASCII
numbers (Figure 3-11). This is the default format.
Chapter 3 Understandin
g
the HP E1429 Di
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itizer 133