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DSP10 is a plug in loop detector for standard function with 2 form C outputs. Available in three voltages, US standard 60Hz mains, European 50Hz mains, and the universal low voltage. Wide adjustment ensures DSP10 can be set to any existing road loop as a drop in replacement.
Loop inductance
20µH to 1500µH (incl lead-in inductance)
Operating Temp
-37°C to 74°C
Operating Voltage
10 to 30V ac/dc @50mA 117Vac 3W 230Vac 3W
Dimensions
60 x 45mm x 104mm
Relay contacts
3 amp @ 240VAC max, Form A
Sensitivity
10 sensitivities 480 - 20ppm
Pulse width
250ms +/- 15ms
DSP10 pinout
Pin
Function
>
1
Power, live ac or +ve
2
Power, neutral ac or -ve
3
Ch B N/O
4
Earth
>
5
Ch A common
6
Ch A N/O
7
loop
8
loop
9
Ch B com
10
Ch A N/C
11
Ch B N/C
DSP10 features
DSP can be set for conventional loops or Diablo's 'Miniloop' single point detector on DIP 8. There are 10 sensitivity settings on a rotary control. DSP10 is shipped 'Fail safe' but can be changed inside.
There are two form C relays on the same channel. Relay A is set for presence. Relay B is programmable for 4 functions, including pulse on arrival on the loop and pulse on leaving the loop.
Although frequency is a function of road loop geometry, there are 4 broad frequency settings to avoid cross interference with neighbouring loops.
Sensitivity boost is another standard function for high bed vehicles. All inputs and outputs are isolated from supply and each other.
DSP10 sensitivity
0
4800ppm
1
3200ppm
2
2400ppm
3
1600ppm
4
1200ppm
5
800ppm
6
600ppm
7
400ppm
8
300ppm
9
200ppm
PPM means parts per million. 4800 PPM is the same as 0.47%
DSP10 DIP functions
DIP 1 is a filter for brief activation of the loop. It must be activated for at least 2 secs before the relay switches, so excluding fast transit or spurrious activation.
DIP 2&3 is used to extend a presence detection. For eaxample, it can prevent a barrier arm decending between a car and a trailer.
DIP 4 sensitivity boost is a hysterisis function. While a vehicle is detected, sensitivity is increased. The theshold for un-detect is lower. It is used for lorries whose tractor has a high mass, but the trailer has a high bed.
DIP 5&6 set relay B function. Options include a loop fail output. Relay A will also close if a loop fault is detected in the default 'failsafe' mode.
DIP 7 sets ambient creep. As conditions change a detector adjusts over time. Ambient ferrous objects will be nulled out over 30 mins when DIP7 is OFF, or over several days when DIP 7 is ON.
DIP 9&10 set 4 frequency options, though the exact frequency is set by the physical layout of the loop.
DSP10 DIP functions
Function
DIP
ON
OFF
Activate delay
1
2sec delay before activation
immediate activation
Release delay
2 & 3
OFF + OFF = no delay
ON + OFF = 2sec delay
OFF + ON = 5sec delay
ON + ON = 10sec delay
Sensitivity boost
4
Sensivity boost
no boost
Ch B function
5 & 6
OFF + OFF = Presence
ON + OFF = Pulse on entry
OFF + ON = Pulse on exit
ON + ON = Loop failure
Presence
7
vehicle ignored after 30 mins
vehicle ignored after days
Loop type
8
Miniloop
normal loop
Frequency
9 & 10
OFF + OFF = High frequency
ON + OFF = Mid hi frequency
OFF + ON = Mid lo frequency
ON + ON = Low frequency
DSP11 11 pin basic
Loop inductance
20µH to 1500µH (incl lead-in inductance)
Operating Temp
-37°C to 74°C
Operating Voltage
10.5 to 30V ac/dc @35mA
Dimensions
36mm x 36mm x 70mm
Relay contacts
1 amp @ 125VAC / 30Vdc max, Form C
Sensitivity
Fixed
The DSP-11 detector is a plug and play detector that self-adapts to most installations. There are no user adjustable settings on this detector.
This micro-sized detector automatically adjusts sensitivity to suit the loop size. It employs special techniques to avoid loop cross-talk with other DSP11 detectors so frequency settings are not needed.
DSP11 pinout
Pin
Function
>
1
Power, live ac or +ve
2
Power, neutral ac or -ve
3
not used/O
4
not used
>
5
Relay common
6
Relay N/O
7
loop
8
loop
9
not used
10
Relay N/C
11
not used/C
DSP11 commissioning
INDICATORS The green 'power' LED blink once per second in normal operation. It will flash slowly for an open circuit loop, and quickly for a shorted loop.
The red 'detect' LED will indicate the status of the relay output, on for detect.
DSP20 dual channel detector
Loop inductance
20µH to 1500µH (incl lead-in inductance)
Operating Temp
-37°C to 74°C
Operating Voltage
10 to 30V ac/dc @50mA 117Vac 3W 230Vac 3W
Dimensions
60 x 45mm x 104mm
Relay contacts
7 amp @ 240VAC max, Form A
Sensitivity
5000, 1000, 500, 250 ppm
Pulse width
150ms on, then 150ms off
DSP20 is a dual channel loop detector on a standard 11 pin base. The pinout options make it a drop in replacement for the 4 most common industry standard wiring patterns. Functions are set on a 12 way DIP switch. Outputs are limited to N/O contacts, but are isolated from supply and each other.
DSP20 pinout options
Pin
no suffix
suffix A
suffix R
suffix N
1
Power, live ac or +ve
2
Power, neutral ac or -ve
3
Ch 2 common
Ch 2 N/O
Ch 1 loop
4
Earth
not used
Ch 1 loop
5
Ch 1 common
Ch 2 loop
6
Ch 1 N/O
Ch 2 loop
7
Ch 1 loop
Ch 2 N/O
8
Ch 1 loop
Ch 2 com
9
Ch 2 loop
Ch 2 com
earth
10
Ch 2 loop
Ch 1 N/O
11
Ch 2 N/O
Ch 2 loop
Ch 1 com
DSP20 options
This 11 pin base detector is available in 3 voltage ranges, US standard 60Hz mains, European 50Hz mains, and the universal low voltage. Power is always on pins 1&2.
Dual detectors only have Form A outputs, meaning N/O. or N/C, but all loop inputs and outputs are isolated from supply and each other.
There are also 4 pinout options that suit the 4 most common wiring shemes. Order with the suffix letter to denote pinout option.
DSP20 switch functions
The detector functions are set on a 12 way DIP switch. There are 4 sensitivity settings per channel, set on 2 pairs of DIP switches. Frequency is set by the physical layout of the loop, but it is best to set one loop to high and the other to low.
Each channel can be set for set for presence, or a single 150ms pulse output. Presence has a default time, but can be set infinite presence (for both channels) on DIP3.
Sensitivity boost (DIP4) is a hysterisis function. When a vehicle is detected the sensitivity is increased so that the theshold for un-detect is lower. It is necessary for lorries, where the tractor has a high mass, but the trailor has a high bed.
If the road loop should fail, the detector will detect the fault. Fail safe mode ensures the relay contact is closed circuit. In fail secure mode, the relay contact is open circuit in the event of a fault.
Two loops can detect the direction of travel by recording which loop is passed over first. In directional mode, the 1st loop to be crossed gives a pulse, but not the scond.
DSP20 DIP functions
Function
Setting
Chan 1
Chan 2
Directional
ON = directional OFF = independant
DIP.1
Fail secure
ON = fail secure OFF = fail safe
DIP.2
Inf pres
ON = infinite OFF = default
DIP.3
Sensitivity boost
ON = boost OFF = default
DIP.4
Pulse/presence
ON = pulse OFF = presence
DIP.9
DIP.5
Sensitivity
Lowest OFF+OFF Highest ON+ON
DIP.10 DIP.11
DIP.6 DIP.7
Frequency
ON = high OFF = default
DIP.12
DIP.8
DSP21 dual detector for parking
The DSP-21 Series Detector was developed for parking industry, where accurate vehicle counting is required. DSP21 has the dual inductive loops necessary to detect vehicle direction.
The DSP-21 Series Detector was designed to retrofit into existing locations that may require a detector upgrade. This detector's algorithms are proven offer substancial improvement in count accuracy leading to revenue gains.
Available with N/O or N/C or opto-isolated solid state outputs.
Loop inductance
20µH to 1500µH (incl lead-in inductance)
Operating Temp
-37°C to 74°C
Operating Voltage
10.5Vdc to 35Vdc @ 25mA 9Vac to 28Vac @ 25mA
Dimensions
60 x 45mm x 104mm
Relay contacts
1 amp @ 125VAC max, Form A
Sensitivity
5000, 1000, 500, 200 ppm
Pulse width
150ms on, then 150ms off
DSP21 pinout
Pin
Function
>
1
Power, live ac or +ve
2
Power, neutral ac or -ve
3
Ch2 Common
4
Earth
>
5
Ch1 Common
6
Ch1 N/O
7
Ch1 loop
8
Ch1 loop
9
Ch2 loop
10
Ch2 loop
11
Ch2 N/O
DSP21 features
Two loops can detect travel direction by noting which loop is passed over first. In directional mode, the first loop to be crossed gives a pulse, but not the second.
DSP21 can operate in one of four selectable modes selected by DIP 1&2. The channels can act independantly, or be used for directional sensing. The two channel directional counting mode is the real differentiator from other dual detectors. This detector is designed to accurately count passenger vehicles.
The detector includes a count testing mode that forces a channel to output a known number of counts every minute. This can be very useful during system start-up and troubleshooting.
The detector analyzes vehicles to improve itself and adjusts for changes in vehicle traffic. Alternative count modes allow the installer to optimise for counting situations.
Available with N/O or N/C or solid state outputs. The N/O version is most popular for counting application.
DSP21 switch functions
The functions are set on a 12 way DIP switch.
Frequency is set by the physical layout of the loop, but it is best to set one loop to high and the other to low. There are 4 sensitivity settings per channel, set on 2 pairs of DIP switches. Each channel can be set for presence, or a single 150ms pulse output.
Sensitivity boost (DIP4) is a hysterisis function that applies to both channels. When a vehicle is detected the sensitivity is increased so that the theshold for un-detect is lower. Useful for lorries or cars towing.
DIP3 sets fail mode. The detector can sense a road loop failure. In fail safe mode, on a fault, the relay contact is closed. In fail secure mode, on a fault, the relay contact is opened.
2 loops can detect traveldirection by noting which loop is passed over first. In directional mode, the 1st loop to be crossed gives a pulse, but not the 2nd.
DSP21 DIP functions
Function
Setting
Chan 1
Chan 2
Operation mode DIP 1&2
OFF + OFF
ON + OFF
OFF + ON
ON + ON
Presence or Pulse, indpedendant
Presence or Count, indpedendant
Presence or Pulse, directional logic
Counting, wiith directional logic
Fail secure
ON = fail secure OFF = fail safe
DIP.3
Sensitivity boost
ON = boost OFF = default
DIP.4
Pulse or presence
ON = pulse OFF = presence
DIP.9
DIP.5
Sensitivity
LowOFF+OFF High ON+ON
DIP.10 DIP.11
DIP.6 DIP.7
Frequency
ON = high OFF = default
DIP.12
DIP.8
Loop diagnostics
Most problems are loop faults. Inspect the ground around the loop for surface break up. To check for open circuit loops, un-plug the connector, then check resistance with a digital test meter. Resistance should be less than 100 ohms.
A temorary loop can be made with 15m of single core cable laid on top of the road surface. It will be sensitive to small movements but stable enough to test the detector module. If this solves the problem you may need to replace the loop.
Loop installation is a well established road technique. We have published articles on this website. There are links below.
