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2.2.4 PULSE MODE (P)
The Pulse mode will provide a 125 ms ± 25ms width output pulse for each vehicle entering
the loop..
2.2.5 CALL MODE (C)
The Call mode will set the channel output to the Call state (True). This mode can be used
to provide a continuous Call state to the Controller Unit regardless of the state of the
detection zone. Loop fault conditions are ignored in this mode.
2.2.6 OFF MODE (-)
The Off mode will set the channel output to the No Call state (False). This mode can be
used if the channel is not used or not connected to a loop. Loop fault conditions are ignored
in this mode.
2.2.7 OUTPUT MINIMUM PULSE OPTION
When the diode jumper labeled OPT2 on the PCB is installed, the unit will limit the
minimum output Call state (True) to 125 milliseconds.
2.3 SET THE FREQUENCY
Pressing the FREQ button once will display the
Frequency Level (1 – 4) without changing the setting.
After pressing the FREQ button to display the current
Frequency Level, the setting can then be changed by
pressing the FREQ button again. The display will
automatically return to the normal display after several
seconds.
The Frequency level needs to be changed only if interference occurs between adjacent
loops connected to different sensor units. Interference or crosstalk may manifest itself as
chattering of the call output or a detect call occurring at the same time as an adjacent unit
when there is no vehicle present. If crosstalk is suspected, try to separate the frequencies
of the channels causing the problem. A minimum of 5 KHz separation is recommended.
Four frequency levels are available on each channel to assist in alleviating interference
affecting more than two units.
Changing the Frequency Level will cause the channel to retune.
2.3.1 DISPLAYING THE LOOP FREQUENCY
The current loop frequency is displayed by after pressing the FREQ button to display the
current Frequency Level. The frequency is shown in KHz with a "-" symbol displayed both
before and after the numeric digits shown on the DEFLECTOMETER
For example, after pressing the FREQ button once the display sequence might show:
"3" "-" "2" "7" "-"
This sequence would indicate Frequency Level "3" and a loop reference frequency of 27
KHz.
2.4 SET THE DELAY AND EXTEND TIMING (LMD301T AND LMD302T ONLY)
2.4.1 DELAY TIMING
For each channel, a delay time of 1 to 63 seconds can be set via the DELAY DIP switches.
The numeric sum of the switches in the On position is equal to the Delay time. Call Delay
Eberle Design Inc.
LMD301, LMD302, and LMD304
Series Operations Manual
Frequency
Level 4
High
Level 3
Medium High
Level 2
Medium Low
Level 1
Low
®
.
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