ORACLE SERIES 2E, 2EC, 4E, 4EC, 4H
Operations Manual
Eberle Design Inc.
Page 4
2.1.4.1 PROBE MODE (ORACLE EC SERIES)
This mode is intended to support the use of point probe type micro sensors.
A
probe type
micro sensor
is a transducer that converts changes in the vertical component of the earth’s
magnetic field to changes in inductance. The resulting change in inductance can then be
sensed by the Oracle EC series detector.
Note that when operating in the Probe mode, the
50% pie graph level is reported as a value of 8 instead of 10 (see 2.1.7.5).
A gap setting is
also provided for optimizing the distinction between closely spaced cars and large trucks,
2.1.4.1.1 PROBE MODE THRESHOLD
The Probe Mode Threshold allows the user to adjust the hysterisis value for the call to no-
call threshold. The default value is 20% of the call strength which is suitable for most probe
applications.
2.1.4.2 RAIL MODE (ORACLE EC SERIES)
This mode is intended to support the use of inductive loops in a light rail application. Rail
applications often produce residual effects on a train car exit from the detection zone that
can cause the detector to remain in the call state. In this case the loop inductance does not
immediately return to the tuned reference value for a short time period.
2.1.4.2.1 RAIL MODE THRESHOLD
The Rail mode allows the user to adjust the hysterisis value for the call to no-call threshold.
The default value is 20% of the call strength which is suitable for most rail applications.
2.1.5 PRESENCE / PULSE MODES
For each channel, a Presence or Pulse output mode may be selected via the “SET UP”
menu. If Presence mode is selected then a choice of Short, Long, or User defined presence
can be selected (see 3.2.4.1). Short Presence is defined as 30 minutes and Long Presence
is defined as 120 minutes. In User Defined mode, a user setting can be applied. On the
expiration of short or long presence time a detect CALL will be reset. In User defined mode,
the detect CALL can be selected to reset on timer expiration or at the next End-Of-Green
(EOG) signal after the expiration of the timer. The green signal is applied to the Timer
Control input via the edge card connector.
In Pulse mode, a 125 ms ± 25 ms width pulse will be output for each vehicle entering the
loop. The pulse length can be programmed from 125 ms to 60 minutes.
2.1.6 DELAY AND EXTEND FUNCTION
2.1.6.1 CALL DELAY TIMER
For each channel, a delay time of 0.1 seconds to 5 minutes can be set via the “SET UP”
menu. Call Delay time starts counting down when a vehicle enters the loop detection area.
Delay time can be overridden by a green signal at the Timer Control input.
2.1.6.2 CALL EXTENSION TIMER
For each channel, an extension time of 0.1 seconds to 1 minute can be set via the “SET
UP” menu. Call Extension time starts counting down when the last vehicle clears the loop
detection zone. Any vehicle entering the loop detection zone during the Extension time
period causes the channel to return to the DETECT state. The Extension timer can be
enabled upon the following options:
2.1.6.2.1 EXTEND ALWAYS MODE (ALWAYS)
When a vehicle leaves the loop zone and the loop zone becomes vacant, then the extend
timer will be enabled and CALL output will be maintained until the timer times out.