Diablo Controls DSP-55 Plug-In Loop and Mini-Loop Vehicle Detector
The Diablo Controls DSP-55 is a small-format vehicle detector made for installations that need a compact detector with flexible loop support and solid-state outputs. It can be used with a normal in-ground inductive loop or with Diablo's mini-loop sensor, making it a common service part for gate operators, access-control cabinets, drive-through lanes, parking equipment, and free-exit installations where cabinet space is limited. Instead of a standard 11-pin socket, the DSP-55 uses a 10-pin Molex style connection and provides solid-state outputs, so it should be matched carefully to the wiring harness or board connection in the existing system. The detector can provide presence and pulse-style functions depending on setup, and it can be configured for fail-safe or fail-secure behavior. When used with a mini-loop, it is best treated as a free-exit or vehicle detection device rather than a monitored entrapment protection sensor.
Compatible With
- Standard in-ground inductive loops when the loop inductance and wiring are within the detector's supported range.
- Diablo Controls mini-loop vehicle sensors where the DSP-55 detector is specified.
- Gate operators, barrier gates, parking controllers, access-control cabinets, and drive-through systems with a compatible 10-pin Molex detector connection.
- Free-exit, vehicle presence, and pulse-output applications using the DSP-55 solid-state output format.
- Replacement for existing DSP-55 detector installations when the connector, voltage, and output wiring match.
- Related mini-loop kit products such as DSP-55-75ft and DSP-55 100 ft kits where the detector and mini-loop are sold together.
- Not a direct replacement for standard 11-pin loop detectors, relay-output detectors, or monitored photo-eye/safety-edge devices without checking wiring and controller requirements.
Features & Specifications
| Manufacturer | Diablo Controls |
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| Product Type | Plug-In Vehicle Detector |
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| Part Number | DSP-55 |
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| Application | Loop and mini-loop vehicle detection |
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| Connector | 10-pin Molex style connection |
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| Loop Compatibility | Standard inductive loop or Diablo mini-loop where specified |
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| Outputs | Solid-state FET outputs including A, B, and -B functions |
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| Fail Mode | Field-configurable fail-safe or fail-secure behavior |
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| Common Use | Free exit, presence, parking, access control, gate detection |
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| Notes | Mini-loop use should not be treated as a monitored safety loop application |
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Also Known As / Related Part Numbers
- DSP-55
- DSP55
- DSP 55
- Diablo DSP-55 detector
- DSP-55-75ft mini loop kit
- DSP-55 100 ft mini loop kit
- Diablo mini-loop detector
- DSP-19 - related low-power detector, not the same output package
- DSP-15 - related detector family, not a direct plug-in match
Technician Note
The 10-pin Molex connector and solid-state output style are important. If the existing cabinet is wired for an 11-pin relay detector, a DSP-55 will not simply plug in unless the proper adapter or wiring design is already in place.
Before Ordering Checklist
- Confirm the existing detector is a DSP-55 or uses the same 10-pin Molex connection.
- Verify whether the site uses a standard loop or a Diablo mini-loop sensor.
- Confirm output wiring for A, B, or -B functions before moving wires.
- Confirm fail-safe or fail-secure requirements for the lane.
- Inspect the loop or mini-loop cable before replacing the detector.
Professional Advisory
Vehicle detectors are often installed in the same cabinet as line-voltage operator wiring. Use a qualified technician for troubleshooting when high voltage, unsafe gate motion, or unknown wiring changes are involved.
Important Ordering Warnings
- Do not use mini-loop detection as a substitute for required monitored safety devices.
- Do not assume the DSP-55 replaces an 11-pin relay detector.
- Wrong fail mode can create unwanted open-gate or closed-gate behavior during loop failure.
Product Q&A
Can the DSP-55 be used with a standard loop?
Yes. The DSP-55 can work with a standard inductive loop when the wiring and loop values are within the supported range.
Can it be used with a Diablo mini-loop?
Yes. It is commonly used with Diablo mini-loop sensors and is also sold in mini-loop kit configurations.
What connector does the DSP-55 use?
It uses a 10-pin Molex style connector, so it should not be confused with standard 11-pin plug-in loop detectors.
Is the DSP-55 a safety device?
It is a vehicle detector. When used with a mini-loop, it should not be treated as a monitored entrapment protection device.
What is the difference between DSP-55 and DSP-55-75ft?
DSP-55 is the detector module. DSP-55-75ft refers to a mini-loop kit configuration that includes the detector and a 75 ft mini-loop sensor assembly.
