Operating Manual

March 2008 5100 ES Models II/III Portable Radio Operating Manual 3-5
General Operation
The Up/Down switch on the front of the 5100 ES portable are typically used to scroll
through the various Zones that a user needs to access. To eliminate inadvertently
switching Zones if the radio is accidentally bumped and the Up/Down switch is pressed, a
Zone Lock function is implemented. The Up/Down switch will not scroll through zones
unless the Zone Lock switch is first pressed. If the Zone Lock switch is pressed, the Up/
Down switch is available for scrolling. Upon five-ten seconds of inactivity, the Up/Down
switch again is not usable for selecting a Zone. The Zone Lock function is programmable
for any programmable button on the radio.
3.3.2 Channel Select
Channels are selected by the rotary 16-position switch on the top panel. The alias
(identification) for the selected channel/group is displayed continuously during normal
operation.
When an unprogrammed channel is selected, “Unprogramd” is displayed and a tone
sounds (if tones are enabled). When conventional channels are selected and the Display
Information option key or menu parameter is programmed, either the channel frequency or
alias can be displayed (see Section 5.8).
The channel selector knob can also be disabled by programming. Channels must then be
directly selected as described next (if applicable). It may be desirable to disable the
channel select knob when direct selection is used in order to prevent confusion since the
channel knob then may not indicate the selected channel.
The radio can also be programmed so that the channel select control is also be disabled by
the Keypad Lock feature (Section 3.6) similar to the volume control described in Section
3.1.3.
3.3.3 Direct Zone / Channel Selection
The Direct Channel Select feature is available if the Channel Select option switch or menu
parameter is programmed. This feature allows channels to be directly selected using the
DTMF keypad numeric keys (DTMF models only) or Up/Down switch (all models).
For direct selection purposes, channels are numbered sequentially starting with the lowest
zone. Each zone can be programmed with up to 16 channels, so Zone 1 channels are
numbered 1-16, Zone 2 channels 17-32, and so on as shown below. For example, Zone 1/
Channel 16 is selected by Channel 16, and Zone 2/Channel 16 is selected by Channel 32.