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User Manual

DSP-22-2

Low Power, Dual Channel Vehicle

Detector with Support for the

Free Exit Probe

DSP-22-2 User Manual Page 2 of 25 DSP-22-2_MAN_E 
Contents 
Figures ....................................................................................................................................................................3 
1. Introduction ...........................................................................................................................................4 
Functional Data.......................................................................................................................................................5 
Electrical Data.........................................................................................................................................................6 
Environmental Data................................................................................................................................................6 
Mechanical Data.....................................................................................................................................................7 
2. Features and Functions...........................................................................................................................8 
Detector Reset........................................................................................................................................................8 
Channel 1 –Enable / Disable (DIP Switch 9)...........................................................................................................8 
Channel 1 –Sensitivity (DIP Switches 1 and 2).......................................................................................................8 
Channel 1 –Normal Sensitivity / Sensitivity Boost (DIP Switch 3) .........................................................................9 
Channel 1 –Frequency (S3 DIP Switches 1 and 2)..................................................................................................9 
Channel 2 –Enable / Disable (DIP Switch 10).........................................................................................................9 
Channel 2 –Sensitivity (DIP Switches 4 and 5).......................................................................................................9 
Channel 2 –Normal Sensitivity / Sensitivity Boost (DIP Switch 6) .......................................................................10 
Channel 2 –Presence / Pulse (DIP Switch 7)........................................................................................................10 
Channel 2 –Loop / Probe (DIP Switch 8)..............................................................................................................11 
Channel 2 –Frequency (S3 DIP Switches 3 and 4)................................................................................................11 
Indicators..............................................................................................................................................................12 
3. Installation...........................................................................................................................................15 
General Rules and Best Practices for Inductive Loops .........................................................................................15 
Detector Installation.............................................................................................................................................16 
Loop Installation...................................................................................................................................................17 
Free Exit Probe Installation...................................................................................................................................20 
4. Troubleshooting ...................................................................................................................................22 
No Power LED .......................................................................................................................................................22 
Detect LED Flashes On Once Every Two Seconds.................................................................................................22 
Detect LED Flashes On Twice Every Two Seconds................................................................................................22 
Detect LED Flashes at the Same Time as the Power LED every Two Seconds......................................................23 
Power LED Intermittently Comes On (Not Once Every 2 Seconds)......................................................................23 
Detect LED Intermittently Comes On / Stays On Without a Vehicle Present.......................................................23 
Detect LED Will Not Come On With a Vehicle Present.........................................................................................24 
Detect 1 and Detect 2 LEDs Flash Back and Forth................................................................................................25 
 
 

DSP-22-2 User Manual Page 3 of 25 DSP-22-2_MAN_E

Figures

Figure 1: Product Views..............................................................................................................................................4

Figure 2: Physical Dimensions ....................................................................................................................................7

Figure 3: Loop Installation....................................................................................................................................... 19

Figure 4: Saw Cut for Home Run Exit and Chiseled Corner for Home Run Exit....................................................... 19

Figure 5 Typical Free Exit Probe Installation ........................................................................................................... 20

DSP-22-2 User Manual Page 4 of 25 DSP-22-2_MAN_E

1. Introduction

The DSP-22-2 detector is intended to be a two-channel detector that can work with both inductive loops as well

as the new Diablo Control Free Exit Probe. The detector is powered by a high-performance 8-bit microcontroller

that does not skimp on performance. The DSP-22-2 detector has a small footprint and was designed to directly

plug into many DoorKing operators.

The detector uses a 3-pin Molex connector for its power connections and the Channel 1 solid state output. The

Channel 2 relay outputs have separate screw terminals for wired connections.

Figure 1: Product Views

DSP-22-2 User Manual Page 5 of 25 DSP-22-2_MAN_E

Functional Data

Sensitivity: Four sensitivities for each channel are user selectable.

Channel 1:

S1 DIP Switch

Sensitivity

OFF

.32% ΔL/L Low

OFF

.16% ΔL/L Medium Low

OFF

.08% ΔL/L Medium High

.04% ΔL/L High

Channel 2:

S1 DIP Switch

Sensitivity

OFF

.32% ΔL/L Low

OFF

.16% ΔL/L Medium Low

OFF

.08% ΔL/L Medium High

.04% ΔL/L High

Frequency Settings: There are four frequency settings available. The actual loop frequency is

dependent on loop circuit inductance.

Channel 1:

S3 DIP Switch

Frequency

OFF

High

OFF

Medium High

OFF

Medium Low

Low

Channel 2:

S3 DIP Switch

Frequency

OFF

High

OFF

Medium High

OFF

Medium Low

Low

B Pulse Output: 250ms ±15ms.

Response Time: 181 ms typical. 314 ms worst case.

Vehicle Hold Time: Both channels will use an extended presence mode of operation. This mode

allows very weak detections to be held for about 15 minutes. Strong detections

can be held for very long periods of time (days or even weeks) as long as power

is not interrupted.

DSP-22-2 User Manual Page 6 of 25 DSP-22-2_MAN_E

Electrical Data

Loop Inductance: 20 microhenries to 1500 microhenries (including lead-in inductance). Not all

frequency settings are available at inductances below 30 microhenries.

Operating Voltage: 14 volts to 27 volts DC

Solid State Output Rating: Maximum Output Current: 250 milliamps

Maximum Pull-Up Voltage: 30 volts

Maximum Voltage Drop Across Active Output: 0.3 volts

Relay Output Rating: 30 VDC, 2 amps (resistive)

110 VDC, 0.3 amps (resistive)

125 VAC, 0.5 amps (resistive)

Current Draw: No Channel in Detect 1.62 milliamps typical @ 20VDC.

Channel 1 in Detect 23.94 milliamps typical @ 20VDC.

Channel 2 in Detect 30.75 milliamps typical @ 20VDC.

Both Channels in Detect 33.60 milliamps typical @ 20VDC.

Environmental Data

Operating Temperature: -35°F to 165°F (-37°C to 74°C)

Storage Temperature: -40°F to 176°F (-40°C to 80°C)

Humidity: Up to 95% relative humidity non-condensing

DSP-22-2 User Manual Page 7 of 25 DSP-22-2_MAN_E

Mechanical Data

Mounting Position: Any

Housing Material: Lexan

Detector Size: 4.300 inches (High) x 2.950 inches (Wide) x .820 inches (Deep)

109.22 mm (High) x 74.93 mm (Wide) x 20.83 mm (Deep)

Figure 2: Physical Dimensions

DSP-22-2 User Manual Page 8 of 25 DSP-22-2_MAN_E

2. Features and Functions

Detector Reset

When any of the DIP switches are changed, the reset button is pressed, or power is cycled to the detector, the

detector will perform a reset. The reset event will last for two seconds while the detector initiates any changes

and waits for all systems to stabilize.

All three LEDs will turn off for 500 milliseconds at the start of the reset event. After that, the Detect 1 and Detect

2 LEDs will flash according to their fail-safe or fail-secure mode of operation. A flash rate that is the same as the

power LED indicates the output is operating as fail-safe. A much faster flash rate indicates that the output is

operating in the fail-secure mode.

NOTE: If a vehicle is over a loop during the reset period it will not be detected.

Channel 1 –Enable / Disable (DIP Switch 9)

Channel 1 has a DIP switch to enable or disable the channel. For those situations where channel 1 is not needed,

the channel can be disabled by setting DIP switch 9 to the OFF position which will turn off the channel 1 LED and

turn off the channel 1 output. The factory default is enabled (DIP switch 9 ON).

Channel 1 –Sensitivity (DIP Switches 1 and 2)

Channel 1 has four possible sensitivity levels. In most situations the sensitivity setting medium high (DIP switch 1

OFF and DIP switch 2 ON) will work effectively. For those situations where this setting is not sensitive enough,

raise the sensitivity. For those situations where the detector is overly sensitive, lower the sensitivity one level at

a time until the desired performance is obtained. Remember that semi-trucks look much smaller than a car. So,

do not set or test the sensitivity using a passenger vehicle if semi-truck traffic will be seen over the loop. The

factory default is low (DIP switch 1 OFF and DIP switch 2 OFF).

Like most inductive loop vehicle detectors, the DSP-22-2 directly measures the change in frequency of the loop

and from there, calculates the change in inductance when a vehicle interacts with it. The change in inductance is

measured as %ΔL/L (reads as “percent delta L over L”).

For the four sensitivities, the detection thresholds are:

DIP Switch

Channel 1 Sensitivity

OFF

.32% ΔL/L Low

OFF

.16% ΔL/L Medium Low

OFF

.08% ΔL/L Medium High

.04% ΔL/L High

DSP-22-2 User Manual Page 9 of 25 DSP-22-2_MAN_E

Channel 1 –Normal Sensitivity / Sensitivity Boost (DIP Switch 3)

Each channel of the detector has a user selectable feature that increases the sensitivity of the detector after initial

detection. This feature is most often used to allow a detector to have a lower starting sensitivity and then increase

it after a vehicle has been detected. This is useful in situations where high-bed tractor-trailer vehicles will be

passing over the loop. With this feature the detector may be able to detect the high-bed portion of the vehicle

without having to be overly sensitive and susceptible to false detections. NOTE: If detection of high-bed tractor-

trailers is required, correctly sized loops must be used.

DIP

Switch 3

Function

OFF

Channel 1 Normal Sensitivity

Channel 1 Sensitivity Boost

Channel 1 –Frequency (S3 DIP Switches 1 and 2)

When loops are installed sufficiently far apart, any two loops will not interfere with each other. However, if two

loops are fairly close together, say two to four feet apart, the inductive fields may couple together and may

interact causing intermittent false detections. The main variables for inductive coupling are loop size, distance

between loops, and the loop frequency. Loops that are connected to the same DSP-22-2 detector can not interfere

with each other, as the detector will only turn on one of the loops at any point in time (this is referred to as

scanning). To aid in mitigating inductive coupling, each DSP-22-2 unit comes with two frequency switches for each

channel. They are binary coded allowing up to four different operating frequencies.

If there are suspicions that loops are interacting, change one of the detector’s frequency settings for the suspect

channel so that their inherent frequencies are sufficiently different as to no longer interact. If the loops are the

same size and number of turns, setting onechannel to high and the other channel to low will provide the maximum

frequency separation.

DIP Switch

Frequency

OFF

Channel 1 High

OFF

Channel 1 Medium High

OFF

Channel 1 Medium Low

Channel 1 Low

Channel 2 –Enable / Disable (DIP Switch 10)

Channel 2 has a DIP switch to enable or disable the channel. For those situations where channel 2 is not needed,

the channel can be disabled by setting DIP switch 10 to the OFF position which will turn off the channel 2 LED and

turn off the channel 2 output. The factory default is enabled (DIP switch 10 ON).

Channel 2 –Sensitivity (DIP Switches 4 and 5)

Channel 1 has four possible sensitivity levels. In most situations the sensitivity setting medium high (DIP switch 1

OFF and DIP switch 2 ON) will work effectively. For those situations where this setting is not sensitive enough,

DSP-22-2 User Manual Page 10 of 25 DSP-22-2_MAN_E

raise the sensitivity. For those situations where the detector is overly sensitive, lower the sensitivity one level at

a time until the desired performance is obtained. Remember that semi-trucks look much smaller than a car. So,

do not set or test the sensitivity using a passenger vehicle if semi-truck traffic will be seen over the loop. The

factory default is low (DIP switch 1 OFF and DIP switch 2 OFF).

Like most inductive loop vehicle detectors, the DSP-22-2 directly measures the change in frequency of the loop

and from there, calculates the change in inductance when a vehicle interacts with it. The change in inductance is

measured as %ΔL/L (reads as “percent delta L over L”).

For the four sensitivities, the detection thresholds are:

DIP Switch

Channel 2 Sensitivity

OFF

.32% ΔL/L Low

OFF

.16% ΔL/L Medium Low

OFF

.08% ΔL/L Medium High

.04% ΔL/L High

Channel 2 –Normal Sensitivity / Sensitivity Boost (DIP Switch 6)

Each channel of the detector has a user selectable feature that increases the sensitivity of the detector after initial

detection. This feature is most often used to allow a detector to have a lower starting sensitivity and then increase

it after a vehicle has been detected. This is useful in situations where high-bed tractor-trailer vehicles will be

passing over the loop. With this feature the detector may be able to detect the high-bed portion of the vehicle

without having to be overly sensitive and susceptible to false detections. NOTE: If detection of high-bed tractor-

trailers is required, correctly sized loops must be used.

DIP

Switch 6

Function

OFF

Channel 2 Normal Sensitivity

Channel 2 Sensitivity Boost

Channel 2 –Presence / Pulse (DIP Switch 7)

The operating mode for channel 2 is selected with DIP switch 7 (Presence or Pulse) and affected by the setting of

DIP switch 8 (Loop or Probe). Presence detection for channel 2 is only available in the inductive loop mode of

operation (DIP switch 8 OFF). If channel 2 is in the probe mode of operation only pulse on entry operation is

available regardless of the setting of DIP switch 7.

In the Presence mode of operation, once activated, the output will remain activated for as long as a vehicle is

detected over the loop. After four minutes of continuous detection, the detector will begin a proprietary

algorithm that is designed to be able to reliably detect the vehicle for long periods of time (days or even weeks)

while still being able to drop the detection once the vehicle exits the loop.

When the probe mode of operation is selected (DIP switch 8 ON), pulse on entry is the only detection mode of

operation for Channel 2. If DIP switch 8 is OFF and DIP switch 7 is ON, Channel 2 is in the pulse mode.

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