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MM-012099-001, Rev. B
32
8 EDACS OPERATION
8.1 CONTROLS
The radio features two rotary control knobs and an emergency button mounted on the top of the radio.
Push-To-Talk and option buttons are mounted on the side. The front mounted keypad has six buttons on
the P5450 Scan model and 15 buttons on the P5470 System Radio.
8.1.1 Buttons and Knobs
This section describes the primary function of the button and knob controls (see Figure 7-2 and Figure
7-3). Other functions associated with these controls are detailed in later sections.
POWER ON-OFF
VOLUME KNOB
Applies power to and adjusts the receiver’s volume. Rotating the control
clockwise applies power to the radio. A single alert tone (if enabled through
programming) indicates the radio is operational.
Rotating the control clockwise increases the volume level. Minimum volume
levels may be programmed into the radio to prevent missed calls due to a low
volume setting. While adjusting the volume the display will momentarily
indicate the volume level (i.e. VOL=31). The volume range is from a minimum
programmed level of zero (displayed as OFF in the display) up to 40, which is
the loudest level.
VOICE GROUP
SELECTION
CONTROL KNOB
Selects systems or group/channels (depending on programming). This is a 16-
position rotary knob.
Note: A mechanical stop, which can limit the positions accessed, is shipped with
the radio but must be installed. To install the mechanical stop, remove the Voice
Group Selection control knob, loosen the set screw on the Voice Group
Selection control knob metal base (using a 1.27 mm hex wrench), and remove
the Voice Group Selection control knob metal base. Replace the 16 channel ring
with the channel stop ring located at the desired channel. Reinstall the Voice
Group Selection control knob metal base, tighten the set screw, and reinstall the
Voice Group Selection control knob.
EMERGENCY/
HOME BUTTON
Automatically selects the pre-programmed Group/System by pressing and
holding for a programmed duration. It can also be used to declare an emergency
by pressing and holding for a programmed duration. The button must be pre-
programmed for either operation, but not both.
PTT BUTTON
Push-To-Talk must be pressed before voice transmission begins. In trunked
mode the radio’s ID is transmitted upon depression of the PTT button.
SIDE OPTION
BUTTON 1
Exits the current operation (removing all displays associated with it) and returns
the radio to the selected talk group. Terminates individual and telephone
interconnect calls.
SIDE OPTION
BUTTON 2
Activates one of a number of programmable software options selected during
PC programming. Programmable options include hi/low power settings, keypad
lock, LCD contrast, LCD and keypad back lighting.