P/N 889-0701-02 Rev June 2020 4 Model 222-1 Operating Instructions
iii. Detect / Fail LEDs:
The Model 222-1 detector has a single two color (green / red) light emitting diode (LED)
per channel to indicate a Call output and/or the status of any current or prior loop failure
conditions. A green indication signifies a Call output (detect state). A red indication
signifies a loop failure condition. A continuous ON (green) state indicates a Call output.
A continuous ON (red) state indicates that a current open loop failure condition or an
inductance change condition of greater than +25% exists. This indication also generates
a Call output. A one Hz (red) flash rate indicates that a current shorted loop failure
condition or an inductance change condition of greater than -25% exists. This indication
also generates a Call output. A flash rate of three 50 millisecond (red) flashes per second
indicates a prior loop failure condition. A flash rate of three 50 millisecond (red) flashes
per second followed by a single 750 millisecond (green) flash indicates a prior loop
failure condition and a current Call output (detect state).
If either channel has the audible detect feature activated, that channel’s Detect / Fail LED
will be illuminated in an orange state for any Call output condition.
Detect / Fail LED
Meaning
OFF
No Detect (No Call Output)
Solid ON (Green)
Detect (Call Output)
Solid ON (Orange)
Audible Detect Signal Activated
Detect (Call Output)
Solid ON (Red)
Open Loop Failure
or
Inductance change condition of
greater than +25% exists
One Hz flash rate (Red)
(50% Duty Cycle)
Shorted Loop Failure
or
Inductance change condition of
greater than -25% exists
Three 50 ms (Red) flashes per
second
Loop Failure condition occurred but no longer exists
Three 50 ms (Red) flashes per
second followed by a single 750
ms (Green) flash
Loop Failure condition occurred but no longer exists
and
Detect (Call Output)
Three 50 ms (Red) flashes per
second followed by a single 750
ms (Orange) flash
Loop Failure condition occurred but no longer exists
Audible Detect Signal Activated
and
Detect (Call Output)
III. Reset:
Changing the position of any of an individual channel’s front panel mounted DIP switches
(except the Frequency switches) resets the channel. When the detector is installed and
operating, the most convenient method for resetting a channel is to momentarily change the
position of the Presence / Pulse DIP switch and then return it to its original position. The
detector can be reset by reapplying power after a power loss. Both detector channels will
also be reset when Pin C is momentarily connected to DC Common.
Operating Instructions
Model 222-1 Series
Firmware Version 222 2.1
TWO CHANNEL
DI P SWIT CH PRO GRAMMABLE
LOO P DETECTO RS
I.
General:
The Model 222-1 is a scanning, two channel, card rack mounted loop detector. Once the
detector is plugged into an appropriately wired card rack with 10.8 to 30 VDC present, the
detector will begin to operate. The detector automatically tunes itself and is operational
within two seconds after application of power or after being reset. Full sensitivity and hold
time require approximately 30 seconds of operation. The detector is fully self-compensating
for environmental changes and loop drift over the full temperature range and the entire loop
inductance range. The Model 222-1 is available with solid state or relay outputs.
The operation of each channel is independent and is programmed using two front panel
mounted eight-position DIP switch modules. Each channel has a single, dual color (green /
red) Detect / Fail LED indicator. The LED provides an indication of the channel’s output
state and loop failure conditions. Output state conditions are indicated when the Detect / Fail
LED is illuminated in a green state. Loop Failure conditions are indicated when the Detect /
Fail LED is illuminated in a red state.
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.
II.
Controls and Indicators:
i. Front Panel Mounted Programming DIP Switches:
The two, eight-position DIP switch modules located on the front panel that are labeled
1
and
2
affect each channel independently. To turn one of these DIP switches
ON
, push the
switch to the left.
SENSE
LEVEL
4
2
1
PRES PULS
1
2
FREQ
DISABLE
(
)
FAIL SAFE
SW ON
1
8
7
6
5
4
3
2
8 Sensitivity Levels:
0
to
7
Presence or Pulse Mode
Switch Disabled (Detector Operates in Fail-Safe Mode)
4 Frequency Selections:
0
to
3
Disable or Enable Channel
Front Panel Eight-position DIP Switch
(Factory Default Settings Shown)
