Overview


The DSP-222T vehicle detector is on the State of California’s (Cal-Trans) QPL list and has been specifically designed to handle NEMA and type 170 traffic applications.

Working on virtually any size loop, the DSP-222 tunes itself automatically to the best operating frequency within the selected range. The DSP- 222’s inherent noise filtering algorithms allow it to work reliably in any electrical situation.

With its easy to understand front panel switches and built-in flexibility the DSP-222T is the most “user friendly” and cost-effective vehicle detector on the market today.

Ordering Information


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Features

  • Loop size: Works on in-ground inductive loops from 50 to 750 microhenries.
  • Fail safe operation: The main solid-state output is configured to output a call whenever the loop circuit has failed.
  • Indicators: Separate “Detect” and “Fault” LEDs for each channel.
  • Sensitivity: Seven sensitivity settings with sensitivity “0” indicating the channel is off.
  • Frequency: Automatically tunes within one of four selectable operating ranges.
  • Main detection output: Factory set to be fail safe and can be programmed to output either presence or pulse.
  • Loop failure: If the loop fails, the fault indicator codes the failure. If the loop recovers, the fault indicator will turn off.
  • Min presence: A minimum presence of 125 ms can be programmed by setting jumper J1 on the PC board. This feature ensures that all presence outputs (even on high-speed arterials) will be at least 125 milliseconds.
  • External reset: The entire detector may be externally reset by holding pin C on the edge connector low for 15 microseconds.

Application Notes


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The DSP-222T vehicle detector is on the State of California’s (Cal-Trans) QPL list and has been specifically designed to handle NEMA and type 170 traffic applications.

Cut Sheet


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DSP-222 – click to download

Instructions & Specs


Sensitivity: Almost all traffic control applications can be handled with sensitivity set at NORMAL (level 4). The sensitivity DIP Switches (S1, S2, and S4) should rarely be moved from NORMAL. However, the Model 222 has seven sensitivity settings varying from a LOW of level 1 to a HIGH of level 7. Sensitivity 0 will disable the channel.

Sensitivity

S1

S2

S3

DL%

Response Time (ms)

0

Off

Off

Off

Off

Off

1

On

Off

Off

.64

0.5

2

Off

On

Off

.32

1

3

Off

ON

Off

.16

2

4

On

On

OFF

.08

4

5

Off

Off

On

.04

8

6

Off

On

ON

.02

18

7

On

On

On

.01

32

Pulse / Presence: With this switch turned on, the main output will be a 125 ms pulse each time a vehicle enters the loop detection area. If the vehicle remains within the loop for two seconds, the detector will automatically retune, making itself ready for the next vehicle to arrive. If this switch is turned off the detector will output presence.

Frequency: One of four operating frequencies can be selected by using the front panel DIP switches: FREQ1 and FREQ2. NOTE: Changing any DIP switch setting automatically resets the detector, which cancels the call output.

Indicators:
The green FAULT LED shows the following status: The red DETECT LED shows the following status:
Normal Off Call On
Loop or lead-in open 1 flash/second No Call Off
Loop or lead-in shorted 2 flashes/second
Intermittent loop 3 flashes/second

NEMA – TS-2: TS-2 outputs are included on Pins 7 (Channel 1) and Pin 20 (Channel 2)

Output Ratings: Solid-State – 50 mA maximum, 30 VDC maximum. All outputs are optically isolated.

Power: 24 VDC, 100 mA maximum

Dimensions: H – 4.5” (11.43 cm) W – 6.875” (17.46 cm) D – 1.12” (2.84 cm)

Operating Temperature: -35°F to 165°F (-37°C to74°C)

Storage Temperature: -67°F to 185°F (-55°C to 85°C)

Humidity: 0 to 95% relative

Connector: Standard 2 x 22 pin edge card connector with key slots located between B & C and M & N.
Pin assignments are listed below:

A DC (-) Common

B DC (+) Power

C Reset

D Loop 1

E Loop 1

F Output 1 Collector

H Output 1 Emitter

J Loop 2

K Loop 2

L Chassis Ground

M – V No Connection

W Output 2 Collector

X Output 2 Emitter

Y – Z No Connection