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Daviteq DI Digital Input Reading Sensor
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Daviteq DI Digital Input Reading Sensor

DI

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1. Introduction

1.1 Overview

Daviteq DI Digital Input Reading Module can be used to read the Digital status of any sensor, machine, or equipment... or count the Pulses from the water meter, flow meter, power meter, gas meter, or proximity sensor...


1.2 Specification
Version DI-12 (Low-speed digital input)
  • Input: 2 Digital channel inputs with dry-contact or voltage input (max 3.3VDC)

  • Functions: Logic Detecting or Pulse Counting

  • Logic Detecting: 2 channels, recommended minimum interval time between 02 statuses is 5 seconds. Data will be sent upon status changed from 0 to 1 or vice versa;

  • Pulse Counting: 1 channel only, max frequency 2Hz, minimum Pulse width (low or high) is 200mS, counter is uint32 type. There are non-resattable counter and resettable counter. When resettable counter reach the threshold, the alarm will be sent (If alarm function is enable), then resettable counter will be reset to zero again. On the other hand, the counter values will be sent in predefined interval time.


Version DI-12H (High-speed digital input)
  • Input: 2 Digital channel inputs with dry-contact or voltage input (max 3.3VDC)

  • Functions: Logic Detecting or Pulse Counting

  • Logic Detecting: 2 channels, recommended minimum interval time between 02 statuses is 5 seconds. Data will be sent upon status changed from 0 to 1 or vice versa;

  • Pulse Counting: 2 channels, max frequency 1kHz, minimum Pulse width (low or high) is 200µS, counter is uint32 type. There are non-resattable counter and resettable counter. When resettable counter reach the threshold, the alarm will be sent (If alarm function is enable), then resettable counter will be reset to zero again. On the other hand, the counter values will be sent in predefined interval time.


1.3 Typical Applications
  • Status detection for reed switch, temperature switch, level switch, pressure switch, gas detector, smoke detector, valve status, pump status, fan status, door status, engine status, and machine status...

  • Run hour counting for motor, pump, fan, machine, equipment...

  • Pulse counting for water meter, flow meter, gas meter, heat meter, energy meter, production counting...

2. Principle of Operation

With version DI-12, the microprocessor of the master device (wireless device or wired device) will read the status of digital input ports in a predefined time interval for battery saving. Therefore it can only count the Pulse with a max 2Hz frequency, and apply for the 1st channel only.


With version DI-12H, the digital input port will connect to an internal timer/counter of the microprocessor for high-speed counting. Therefore it can count the pulse up to 1 kHz, for both 2 channels.

3. Calibration

This kind of sensor does not require calibration. However, the user can validate the status of digital input or validate the counting value by using a standard Pulse Generator.


How to validate the Pulse counting value? Please find the below instructions.

4. Application Notes

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5. Installation Notes

Notes:
  • Recommend using the shielded cable with twisted pairs;

  • The cable length should be as short as possible, typical max 2m. Longer cable can be used, but need actual testing;

  • Avoid the installation near by the high magnetic field like high power Motors, Transformers, and Power Generator.


Here are the wiring diagrams, applied for all versions.


Wiring for Dry-contact output

Wiring for Voltage input (max 3.3V)

6. Troubleshooting

  1. The Digital input status is incorrect: check the wiring diagram, check the cable type and cable length, check the signal;

  2. The pulse counting value is missing (smaller values): the pulse has higher frequency or duty cycle of pulse is too short, OR wiring problem. Please check the specification and check wiring;

  3. The pulse counting value is higher than pulse generation device: there is noise. Please check the cable type, cable length, wiring...

7. Maintenance

There is no maintenance requirement for this kind of device.

8. Default Configuration