Data Storage
Nonvolatile Memory
The data storage capability of a Series 4400 control con-
sole includes a nonvolatile memory; that is, data re-
mains in storage, even though main power is removed,
due to battery backup. The retention period of the non-
volatile memory, with a fully charged battery, is up to
ninety days without refreshing.
The variables and system functions stored in nonvolatile
memory are shown in Table 4-4. Listed in the table is the
default value or condition of each variable or function.
These default values are restored whenever the system is
reset by the key sequence described below.
System Reset
To reset the system, press S1 on the Main Panel, then
press 0 and ENTER on the keypad. The nonvolatile
memory will be cleared, including data from a previous
test, and all variables, limits and system functions will
be reset to their default values, as shown in Table 4-4.
The Main Panel Display will show “LOSS”.
Volatile Memory
The following variables or system functions are volatile; that
is, the value of the variable or function condition will be re-
stored to a default state whenever main power is removed:
Data Storage M10-94400-1
4-16
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