ORACLE SERIES 2E, 2EC, 4E, 4EC, 4H
Operations Manual
Eberle Design Inc.
Page 5
2.1.6.2.2 EXTEND ON-GREEN MODE (ONGREEN)
If the Timer Control input is inactive and the loop becomes vacant after a vehicle exits, then
the Extend timer will not be enabled and the CALL output will be cleared. When the Timer
Control input is active and the loop becomes vacant after a vehicle exits, then the Extend
timer will be enabled and the CALL output will be maintained until the timer times out. While
the timer is running, the DETECT LED will flash 4 times a second. If the timer is running
and the Timer Control input becomes inactive, the timer will be disabled and the CALL will
be cleared. If the timer is running and a vehicle is detected, the timer will be disabled and
the CALL maintained until the loop again becomes vacant, at which point the extend
process repeats.
2.1.6.2.3 EXTEND DISCONNECT (DISCNNCT)
While the Timer Control input is inactive, the Extend/Disconnect timer is not used and a
CALL is output whenever a vehicle is detected. If the Timer Control input is active and the
loop becomes empty after a vehicle exits, then the Extend Disconnect timer will be
enabled. While the Extend Disconnect is running, the detect LED will flash 4 times a
second. If a vehicle is detected while the Extend Disconnect is running the Extend
Disconnect timer will be disabled. If the Extend Disconnect timer times out while the Timer
Control input is active, then the CALL output will be disabled and future detects ignored.
When the Timer Control input becomes active, the CALL output will be enabled again.
2.1.6.2.4 EXTENSION PLUS DISCONNECT (EXT+DIS)
While the Timer Control input is inactive, the Extend/Disconnect timer is not used and a
CALL is output whenever a vehicle is detected. When the Timer Control input becomes
active the Extend/Disconnect timer is enabled. While the Extend/Disconnect timer is
running, the detect LED will flash 4 times a second. If a vehicle is detected while the
Extend/Disconnect timer is running the Extend/Disconnect timer will be disabled. If the
Extend/Disconnect timer times out while the Timer Control input is active, then the CALL
output will be disabled and future detects ignored. When the Timer Control input becomes
active, the CALL output will be enabled again.
2.1.6.3 TIMER CONTROL INPUTS
Timer Control inputs are provided for each channel to modify the operation of the Delay
and Extension functions. The application of a True (low) state voltage will inhibit the Delay
timing function and/or enable the Extend timing function as described in sections 2.1.6.1
and 2.1.6.2. When the Timer Control input for a channel is active (True) a “G” character is
displayed on the main display screen.
Timer Control inputs are primarily provided for downward compatibility. For the ORACLE
4E, 4EC, and 4H models, a Timer Control input is provided for all four channels. For
channels 3 and 4, the Timer Control inputs use pins that are defined in Nema TS2 as
Detector Unit Address inputs (see 6.6.2). When operating an ORACLE 4E, 4EC, or 4H in a
Nema TS2 detector rack, the Delay and Extend functions may not be available for channels
3 and 4 depending on the wiring of the rack.
2.1.7 CHANNEL DISPLAY
During normal operation each channel displays the Channel ID, Sensitivity setting,
Countdown timers, the Deflectometer, and the option of Frequency, Inductance, or Count
which can be selected by pressing the SCROLL switch Down. When the Timer Control
input for a channel is active (True) a “G” character is displayed.
2.1.7.1 COUNT DOWN TIMERS
The countdown timers are automatically displayed when a vehicle is detected, or in the
case of the Disconnect timer, when the Timer Control input becomes active. The time
remaining is displayed in minutes and seconds. A character is displayed to indicate which