NavCom Sapphire Rev.J - Manual (Page 194)

Sapphire Technical Reference Manual Rev. J
194
1.138 PWALARMLVL (ASCII)
SF-3050 Sapphire SF-3040
This command is used with the SF-3040 to configure the receiver for the type of batteries
installed and the proper voltage levels that determine when a battery is near the end of its useful
charge. There are three specified voltages, each corresponding to a different temperature range
due to the changing characteristics of the batteries at different temperatures: The LOW range is
anything less than 12°C, NORM is 12
– 33°C, and HIGH is anything greater than 33°C. This
command is used with the SF-3040 only when factory supplied batteries are not used. This
command allows the end user to configure the receiver for the type of batteries installed and the
proper voltage levels that determine when a battery is near the end of its useful charge.
Command: [PWALARMLVL] type_num, min_low_v,min_norm_v, min_high_v
Parameter Definition
TYPE_NUM
A number assigned during the battery qualification process, it identifies the battery
model for informational purposes only
MIN_LOW_V The threshold voltage for the low temperature range
MIN_NORM_V The threshold voltage for the normal temperature range
MIN_HIGH_V The threshold voltage for the high temperature range
When a battery ’s voltage drops below the specified value for the current temperature, it is
considered to be at the end of its useful charge and the receiver switches to the other battery for
power. The voltage levels are determined as part of the qualification process and are fixed for
each battery type.
When entered without parameters, this command generates a response message with the
currently configured parameters.
Example: [PWALARMLVL]1,6.2,6.5,6.8
Sets the battery type to 1, the minimum allowed battery voltage for the low
temperature range to 6.2V, the minimum allowed battery voltage for the normal
temperature range to 6.5V, and the minimum allowed battery voltage for the high
temperature range to 6.8V

The threshold voltage for each temperature range is the voltage which, if the
battery falls below this value, the battery status will change from BAT_GOOD to
BAT_LOW, and its LED will change from GREEN to RED. The current temperature
is the ambient temperature inside the unit. If the current temperature is, for
example, 30°C and a battery voltage falls below 6.5 V, then its status will change
from BAT_GOOD to BAT_LOW, its LED will change from GREEN to RED, a one-
second alarm will sound to alert the operator of the change, and, if the battery was
the currently selected battery (if it was the current power source), the software will
switch to the other battery (assuming the status of the other battery is
BAT_GOOD).

The minimum allowed battery voltage is the threshold where the battery status will
change from BAT_GOOD to BAT_LOW and its LED will change from GREEN to
RED (assuming its status was BAT_GOOD before falling below the threshold
voltage specified in the [PWALARMLVL]).