2
3
Channel Disable (DISABLE) (DIP Switch 1):
When the
DISABLE
DIP switch is turned
ON
, the channel’s output is continuously in
the No Call state regardless of the presence or absence of vehicles over the loop. The
loop oscillator is not activated when the channel is in the disabled state. The factory
default setting of this switch is
OFF
.
NOTE:
Changing the Channel Disable switch setting will reset the detector channel.
Frequency (FREQ) (DIP Switches 2 and 3):
Each channel of the Model 222-1 detector has four (4) frequency selections that allow
altering the resonant frequency of the loop circuit. DIP switches 2 and 3 are used to
select the frequency for a given channel. The value (
1
or
2
) to the left of the DIP switch
is assigned to the switch when the switch is
ON
. If the switch is
OFF
, the switch has a
value of zero (0). By adding the switch
ON
and
OFF
values, the two switches will
combine for values from 0 to 3 that indicate one of the four frequency selections. The
following table is a reference for the switch settings and associated frequency selections.
NOTE:
After changing any Frequency switch setting(s), it is necessary to reset the
detector channel by momentarily changing one of the other switch positions.
Frequency
Switch 3
Switch 2
Effective Value
HI
*
OFF *
OFF *
0 + 0 =
0
*
MED HI
ON
OFF
1 + 0 =
1
MED LO
OFF
ON
0 + 2 =
2
LO
ON
ON
1 + 2 =
3
* Factory default setting.
Fail Safe / Fail Secure Mode (FAIL SAFE) (DIP Switch 4):
The Model 222-1 is a version of the Caltrans approved Model 222 that has the Fail-Safe /
Fail-Secure DIP switch disabled and is defaulted for Fail-Safe operation. When DIP
switch 4 is turned
ON
or
OFF
, the channel’s output maintains a Call state during a loop
failure condition.
NOTE:
Changing the Fail-Safe / Fail-Secure switch setting will reset the detector
channel.
Presence / Pulse Mode (PRES PULS) (DIP Switch 5):
DIP switch 5 controls the output mode of each channel.
PRESENCE (
PRES
): When the switch is in the
ON
position, Presence Mode is
selected. Presence Mode will hold the smallest vehicle for four minutes minimum and
either a small truck or a car typically for one to three hours. This is the factory default
setting and the most common setting.
PULSE (
PULS
): When the switch is in the
OFF
position, Pulse Mode is selected.
Pulse Mode will generate a single 125 millisecond pulse output for each vehicle
entering the loop detection area. Any vehicle remaining in the loop longer than two
seconds will be tuned out providing full sensitivity for the vacant portion of the loop
detection zone. Full sensitivity for the entire loop detection zone is recovered within
one second following the departure of any vehicle, which has occupied the loop for
longer than two seconds.
NOTE:
Changing the Presence / Pulse switch setting will reset the detector channel.
Sensitivity (SENSE LEVEL) (DIP Switches 6, 7, and 8):
There are eight (8) selectable sensitivity levels for each channel. The eight sensitivity
levels are selected via DIP switches 6, 7, and 8 on each of the two front panel mounted
eight-position DIP switch modules. The value (
1
,
2
, or
4
) to the left of the DIP switch is
assigned to the switch when the switch is
ON
. If the switch is
OFF
, the switch has a
value of zero (0). By adding the switch
ON
and
OFF
values, the three switches will
combine for values from 0 to 7 that indicate one of the eight sensitivity level selections.
Choose the lowest sensitivity level that will consistently detect the smallest vehicle that
must be detected. Do not use a sensitivity level higher than necessary. The factory
default setting is Sensitivity Level 6: -
∆
L/L = 0.02% for detection. The following table is
a reference for the switch settings and associated sensitivity selections.
NOTE:
Changing the Sensitivity Level setting will reset the detector channel.
Sense Level
-
Δ
L/L
Switch 6
Switch 7
Switch 8
Effective Value
0
1.28%
OFF
OFF
OFF
0 + 0 + 0 =
0
1
0.64%
ON
OFF
OFF
1 + 0 + 0 =
1
2
0.32%
OFF
ON
OFF
0 + 2 + 0 =
2
3
0.16%
ON
ON
OFF
1 + 2 + 0 =
3
4
0.08%
OFF
OFF
ON
0 + 0 + 4 =
4
5
0.04%
ON
OFF
ON
1 + 0 + 4 =
5
6 *
0.02% *
OFF *
ON *
ON *
0 + 2 + 4 =
6 *
7
0.01%
ON
ON
ON
1 + 2 + 4 =
7
* Factory default setting.
ii. Front Panel Mounted Pushbutton - Audible Detect Buzzer:
A front panel mounted pushbutton labeled
BUZZER
is used to enable an audible detect
signal that is emitted any time a given channel’s detection zone is occupied. To activate
this feature, press the pushbutton. Only one channel can have this feature active at any
given time. The first time the pushbutton is pressed, a short (50 millisecond) audible
signal confirms the activation of the feature for Channel 1. The second time the
pushbutton is pressed, two short (50 millisecond) audible signals confirm the activation
of the feature for Channel 2. To deactivate this feature, press and hold the pushbutton for
one second. A long (250 millisecond) audible signal confirms the deactivation of the
feature. This feature will automatically turn off 15 minutes after activation.
NOTE:
When operating in Pulse mode, the audible detect signal will cease if a vehicle
occupies the detection zone for more than two seconds.
