User's Manual

Revised: 4/29/2011 6650-11-0014 R4
Approval: Page 7 of 17
4.1 HANDSET CONTROLS:
Volume / Power (On/Off) Knob:
The Volume Knob is located on the top right of the handset. Rotating clockwise will first turn on
the handset and then increase the volume. Rotate counter clockwise to lower the volume and
turn off the handset.
Group Select Knob:
The group select knob is located on the top middle of the handset. The knob allows the
selection of 16 different groups for voice and text messages. See section 5.1 for more
information.
Emergency Button:
The emergency button is located on the top left of the handset. Pressing the emergency button
signals an emergency condition to the Mine Operation Center. See section 5.3 for more
information.
Clear Button:
The clear button is located on the upper left side of the handset. Pressing the clear button will
return you to the Home Menu from any sub menu. Pressing the clear button while in the home
menu will set the call destination to the currently selected group.
Push To Talk Button:
The push to talk button (PTT) is located on the middle left side of the handset. Press and hold
the PTT button will place a voice call to the current call destination.
Key Pad:
The keypad is located on the lower front of the handset. It is divided into two sections. The
lower section is an alpha numeric pad used for writing text messages and setting the call
destination for handset to handset calls. The upper portion is made up of four menu select
buttons. Pressing these buttons will activate the menu function located above them.
Microphone:
The microphone is located on the front left of the handset just above the display. When making
a voice call, make sure the microphone is level with your mouth.
Accessory connector:
The accessory connector is located on the right side of the handset and is used to connect
optional accessories such as a speaker microphone. Always make sure the connector is
covered when not in use. Use only IWT approved accessories. Using unapproved accessories
may result in a non-intrinsically safe condition, unauthorized RF emissions, and may void the
warranty. Do not install or remove accessories while below ground.