-7-
(Operation CONT’D)
MANUAL
Rotary Switch
Position
Function When MANUAL Pressed
MANUAL
or HF
Produces a rising siren tone while being pressed. The siren
output “winds down” when the MANUAL button is released.
PA
Also produces a rising tone, but the siren output immediately
stops when the button is released.
THUNDER/YELP/WAIL
The MANUAL button will “step” the siren up to the next button’s
programmed tone:
(
WAIL
YELP
THUNDER
Thunder Step Up
)
These quicker tones are used to momentarily alert motorists at
intersections and very highly congested areas. Pressing the
MANUAL button once changes to the next faster tone. Pressing
the MANUAL button again, reverts the siren back to the original
tone.
HORN
Pressing the HORN button provides a simulated air-horn tone while pressed. This can
be used to either replace or to supplement the normal vehicle horn and is useful at
intersections. This tone will override all other siren tones.
See pages 4-5 for
programming optional Air Horn tones.
The front panel of the ST240 contains a two-way
momentary switch for the Manual function and
the Air Horn.
Radio Volume
The radio repeat volume (VOL.) control is recessed in the upper
left hand corner of the front face. This should be set when the
vehicle is parked. First set the volume level of the vehicle's two-
way radio to its normal operating volume. Adjust the siren's
rotary selector switch into the RADIO position. Insert a small, flat
blade screwdriver into the VOL. adjustment port. Turn in a
clockwise direction to increase the sound level.
Microphone
The attached microphone is used for public address
operation and overrides any siren tone when its
push-to-talk (button on the side) is pressed.
Auxiliary Input
An auxiliary input may be connected to the vehicle horn ring or other switching
device
(see page 3)
. It provides the same operation as pressing the HORN button or
can be programmed to function like the MANUAL button
(see page 5).
Park-Kill Cutout
During installation, the Park-Kill input may be connected to a door switch
(see page
3).
This feature will automatically turn off any siren tone when the door is opened.
The siren tone will remain off even if the door is closed. Changing any switch or
input will restore normal functioning of the siren tones.