Operating Manual

March 2008 5100 ES Models II/III Portable Radio Operating Manual 3-11
General Operation
4 Install the included locking screw in the latch tab in the location shown.
Figure 3.3 Accessory Connector
3.5 Backlight
The backlight for the display and option keys can be programmed to automatically turn on
when any key is pressed. It then automatically turns off after a programmed delay of 0-7.5
seconds so that battery drain is minimized. If the Backlight option switch or menu
parameter is programmed, the user can manually turn the backlight on and off (it then
stays on). If the Surveillance mode is programmed, the backlight is disabled (see Section
4.8). The radio can be programmed so that the backlight turns on in the keypad lock mode
when a key is pressed (see next section).
3.6 Keypad Lock
The Keypad Lock feature temporarily disables the front panel keys to prevent keys from
being accidentally pressed. This feature is available if the Keypad Lock option switch is
programmed. To lock the keypad, simply press the Keypad Lock option switch. Then to
unlock the keypad again, press and hold this switch until a tone sounds (approximately
one second).
Permanent Keypad Lockout can also be programmed. The keypad is then permanently
disabled and cannot be enabled by the user. Additional information on this feature follows.
• A global “Front Keypad Lockout Only” function can be selected by programming. The
front panel keys but not the side panel option keys are then disabled by the preceding
Install Lock
Screw Here
Accessory Connector
Latch
Hook