GENERAL OPERATION
21
Keypad Lock
If the Keypad Lock option switch has been programmed, the keypad
can be locked (disabled) to prevent keys from being accidentally pressed.
To lock the keypad, simply press this switch. Then to unlock it again,
press and hold it until a tone sounds. The keypad can also be disabled by
system operator programming. It is then permanently disabled and cannot
be re-enabled by the user.
Low Battery Indication
When the battery voltage falls below a preset level, the radio can be
programmed so that any or all of the following indications occur:
•
“Low Battery” flashes in the display every 5 seconds
•
A chirp sounds every 5 seconds in the receive mode.
•
A chirp sounds every 5 seconds in the transmit mode.
The battery should be recharged as soon as practical after a low
battery indication appears. Refer to page 64 for more battery information.
Channel and Zone Selection
Channel Select
To change the current channel, rotate the 16-position channel
selector knob on the top panel to the desired position. With SMARTNET/
SmartZone channels, the selected channel is always indicated by alias
(name). The alias is also displayed with conventional channels if the
Display Mode option switch is not programmed. If this switch is
programmed, the channel number or frequency may also be displayed
(see “Display Mode Selection” on page 30).
Zone Select
A zone is a group of up to any 16 conventional and SMARTNET/
SmartZone channels defined by system operator programming. Up to 16
Summary of Contents for 51 Series
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