Diablo Controls, Inc. DSP-55 Manual de usuario

Diablo Controls, Inc.

Document: DSP55_MAN_D

Released: 11/30/2020

Pros Who Know Trust Diablo

User Manual

DSP-55

Vehicle Detector with Two Outputs

and Supports the Free Exit Probe

DSP-55 User Manual Page 2 of 28 DSP55_MAN_D 
1. Contents 
Figures ....................................................................................................................................................................3 
2. Introduction ...........................................................................................................................................4 
Functional Data.......................................................................................................................................................5 
Electrical Data.........................................................................................................................................................6 
Environmental Data................................................................................................................................................6 
Mechanical Data.....................................................................................................................................................7 
3. Features and Functions...........................................................................................................................8 
Solid-State Outputs.................................................................................................................................................8 
Detector Reset........................................................................................................................................................8 
Presence Detection.................................................................................................................................................9 
Pulse Detection.......................................................................................................................................................9 
Sensitivity (Rotary Switch)....................................................................................................................................10 
Frequency (DIP Switches 9 and 10) ......................................................................................................................10 
Loop / Magnetometer (DIP Switch 8)...................................................................................................................11 
Normal / Extended Presence (DIP Switch 7) ........................................................................................................11 
Output B Selection (DIP Switches 5 and 6)...........................................................................................................12 
Normal Sensitivity / Sensitivity Boost (DIP Switch 4) ...........................................................................................14 
Fail-Safe / Fail-Secure (DIP Switch 3)....................................................................................................................14 
Delay / Extension (DIP Switches 1 and 2).............................................................................................................15 
Indicators..............................................................................................................................................................16 
4. Installation...........................................................................................................................................20 
Detector Installation.............................................................................................................................................20 
Loop Installation...................................................................................................................................................20 
Free exit probe Installation ..................................................................................................................................23 
5. Configuration .......................................................................................................................................24 
Wiring ...................................................................................................................................................................24 
6. Troubleshooting ...................................................................................................................................25 
No Power LED .......................................................................................................................................................25 
Power LED Flashes Slowly (1 Hz) ..........................................................................................................................25 
Power LED Flashes Quickly (5 Hz).........................................................................................................................25 
Power LED Shows Two Quick Flashes Once Every Two Seconds..........................................................................26 
Detect LED Intermittently Comes On / Stays On Without a Vehicle Present.......................................................26 
Detect LED Will Not Come On With a Vehicle Present.........................................................................................27 
 
 

DSP-55 User Manual Page 3 of 28 DSP55_MAN_D 
Figures 
Figure 1: Product Views..............................................................................................................................................4 
Figure 2: Physical Dimensions ....................................................................................................................................7 
Figure 3: Outputs with No Delay or Extension........................................................................................................ 13 
Figure 4: Outputs with Delay................................................................................................................................... 13 
Figure 5: Outputs with Extension............................................................................................................................ 13 
Figure 6: Power LED States...................................................................................................................................... 17 
Figure 7: Detect A LED States .................................................................................................................................. 18 
Figure 8: Detect B LED States .................................................................................................................................. 19 
Figure 9: Loop Installation....................................................................................................................................... 22 
Figure 10: Saw Cut for Home Run Exit and Chiseled Corner for Home Run Exit..................................................... 22 
Figure 11 Typical Free exit probe Installation ......................................................................................................... 23 
 
 

DSP-55 User Manual Page 4 of 28 DSP55_MAN_D

2. Introduction

The DSP-55 detector is intended to be a full-featured single channel detector that can work with both inductive

loops as well as the new Diablo Controls mini-loops. Many features have been included which are normally found

only on more expensive models. The small package is powered by a high-performance 8-bit microcontroller that

does not skimp on performance. The DSP-55 detector has a small footprint and was designed to retrofit into many

existing locations that may require a detector upgrade. This allows maintenance personnel to carry only one

detector to meet most, if not all, of their vehicle detection needs.

The detector uses a 10-pin Molex connector for its connections and has three solid-state (open-collector) outputs.

The solid-state outputs allow for a smaller total package size, lower power consumption, and elimination of

contact bounce.

Figure 1: Product Views

DSP-55 User Manual Page 5 of 28 DSP55_MAN_D

Functional Data

Sensitivity: Ten sensitivities are user selectable.

Setting

Sensitivity

Setting

Sensitivity

.48% ΔL/L

.08% ΔL/L

.32% ΔL/L

.06% ΔL/L

.24% ΔL/L

.04% ΔL/L

.16% ΔL/L

.03% ΔL/L

.12% ΔL/L

.02% ΔL/L

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

dependent on loop circuit inductance.

DIP Switch

Frequency

OFF

High

OFF

Medium High

OFF

Medium Low

Low

B Pulse Output: 250ms ±15ms.

Response Time: Response time is dependent on the sensitivity selected.

Setting

Response Time

Setting

Response Time

70ms ±10ms

140ms ±20ms

70ms ±10ms

140ms ±20ms

70ms ±10ms

140ms ±20ms

70ms ±10ms

140ms ±20ms

Vehicle Hold Time: In Normal Presence Mode: Approximately 1 hour for a detection of 1% ΔL/L.

In Extended Presence Mode: Approximately 1 to 2 days for a detection of 1% ΔL/L.

DSP-55 User Manual Page 6 of 28 DSP55_MAN_D

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 Voltages: One wide range power version:

8 volts to 35 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

Current Draw: Without a call is 31 milliamps maximum.

With a call is 40 milliamps maximum.

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-55 User Manual Page 7 of 28 DSP55_MAN_D

Mechanical Data

Mounting Position: Any

Housing Material: Lexan

Housing Size: 2.375 inches (High) x 2.240 inches (Wide) x .860 inches (Deep)

60.33 mm (High) x 56.90 mm (Wide) x 21.84 mm (Deep)

Figure 2: Physical Dimensions

DSP-55 User Manual Page 8 of 28 DSP55_MAN_D

3. Features and Functions

Solid-State Outputs

The DSP-55 has three solid-state (open-collector) outputs. Solid-state outputs have several advantages over relay

outputs:

•Allows for a smaller form factor

•Lower power consumption

•Outputs do not have to be debounced (relay contact bounce when closing)

•Higher reliability due to no moving parts

But they also have their limitations:

•Requires that the detector and the operator have the same DC common

•Requires a pull-up resistor to function correctly

•The output can only be pulled down to DC common (can only sink current)

•Limited current switching capability (250 milliamps)

•Polarity sensitive (will not work if connected backwards)

With proper engineering these limitations can be easily overcome, and the benefits of the solid-state output can

be fully realized. Almost all operators are now designed to share their DC common with external devices and have

built in pull-up resistors on their inputs to facilitate working with solid-state (open-collector) outputs. These inputs

usually require less than 20 milliamps of current sinking capability to be activated.

The polarity issue is handled by the operator if the detector plugs directly into the operator. If using an adapter

board like the RK-1 or RK-3, the negative side of the output is already connected to DC common. So, the output

is simply connected to the desired termination point on the controller and it should all work.

The three outputs that are available on the DSP-55 are Output A, Output B, and Output B Inverted. The operation

of Outputs A and B are discussed in the following sections. Output B Inverted is always the opposite of Output B.

This means that if Output B is active Output B Inverted is not and if Output B is not active then Output B Inverted

will be. Output B Inverted will not be mentioned outside of this section, as it is always the opposite of Output B.

The easiest way to envision the function of a solid-state (open-collector) output is to think of it as a normally open

relay contact with the relay common connected to DC common. In this way, Output A and Output B can be

envisioned as normally open contact closures and Output B Inverted as a normally closed contact.

Detector Reset

When any of the DIP switches or the 10-position rotary switch is changed, 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 A and Detect

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

DSP-55 User Manual Page 9 of 28 DSP55_MAN_D

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.

Output A will be active if the detector is in the fail-safe mode. Output B is always fail-secure and will not activate

during a reset.

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

Presence Detection

Presence detection is only available in the inductive loop mode of operation (DIP switch 8 OFF). If the detector is

in the magnetometer mode of operation only pulse on entry operation is available.

While in the inductive loop mode of operation, Output A will always operate in the presence detection mode.

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 to slowly retune the detector with the goal of tuning out

the vehicle that stalled or parked on the loop over a relatively long time.

The time it takes to complete the retuning process is dependent on the strength of the call being induced by the

vehicle. In the Normal Presence mode usually takes between 15 minutes and about 4 hours. In the Extended

Presence mode, the retune process may take over 24 hours. When the retuning process is complete, any loop

area that vehicles can still travel over will still detect the vehicle as expected. Once the vehicle leaves, the detector

will fully recover from the retuning process within 1 second.

Output B can be set to operate in the TruePresence mode (not available in the magnetometer mode of operation).

In this mode Output B activates as soon as a vehicle enters the loop and drops as soon as the loop is no longer

occupied. The output will ignore any Delay or Extension features that are currently active.

Pulse Detection

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

mode of operation and is applied to Output A and Output B. If the detector is in the loop mode of operation pulse

on entry and pulse on exit modes of operation are available.

In the loop mode of operation Output B can be configured for pulse on entry or pulse on exit operation. The pulse

generated by the output will be 250 milliseconds long. Output B will follow any Delay or Extension features that

are currently active. Pulse operation is not available on the A output except in the magnetometer mode of

operation.

In the magnetometer mode of operation Output A and Output B are always configured for pulse on entry

operation. The pulse generated by Output A can be modified using the extension feature. If no extension is active

the pulse will be 250 milliseconds long. If the 2-second extension feature is active the pulse will be 2 seconds long.

If the 5-second extension feature is active the pulse will be 5 seconds long. The pulse generated by Output B will

always be 250 milliseconds long. If the 2-second delay feature is active, Output A and Output B will not pulse until

a vehicle has been continually detected for the 2-second delay time.

DSP-55 User Manual Page 10 of 28 DSP55_MAN_D

In Pulse on Entry mode, Output B will pulse when the Output A activates. If the delay feature is enabled, the pulse

will not occur until the delay has timed out and the loop is still occupied. The output will not pulse again until the

loop has been unoccupied, and any enabled extension has timed out. After the pulse has been outputted, the

Detect B LED will flicker (a very fast flash that is not at full brightness). This is a visual indication that the pulse has

already been output but the loop is still occupied, and no further pulses can be output until the loop is no longer

occupied.

In Pulse on Exit mode, Output B will pulse when Output A deactivates. If one of the extension features is enabled,

the pulse will not occur until the extension has timed out and the loop is still vacant. The output will not pulse

again until the loop has been reoccupied and any enabled delay has timed out. Before the pulse has been output,

the Detect B LED will flicker (a very fast flash that is not at full brightness). This is a visual indication that a vehicle

is being detected and the pulse will be output when the vehicle exits or is eventually tuned out.

NOTE: In the magnetometer mode of operation the detector will only hold a detection for 2 seconds. Therefore,

if a vehicle stays over the sensor for more than 2 seconds it may generate additional pulses for the same vehicle.

Sensitivity (Rotary Switch)

The detector has ten (10) sensitivity levels. In most situations the sensitivity setting five (5) will work effectively.

For those situations where this setting is not sensitive enough, raise the sensitivity one level at a time until the

desired performance is obtained. For those situations where the detector is overly sensitive, lower the sensitivity

one level at a time until the desired performance is obtained. The factory default is five (5).

Like most inductive loop vehicle detectors, the DSP-55 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 ten sensitivities, the thresholds are:

Setting

Sensitivity

Setting

Sensitivity

.48% ΔL/L

.08% ΔL/L

.32% ΔL/L

.06% ΔL/L

.24% ΔL/L

.04% ΔL/L

.16% ΔL/L

.03% ΔL/L

.12% ΔL/L

.02% ΔL/L

Factory Default

Frequency (DIP Switches 9 and 10)

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. To aid in mitigating inductive coupling, each DSP-55 unit comes with two

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

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