Bluetooth Optical Probe OP-740

With Android Meter Data Collection Library

Bluetooth Optical Probe OP-740

Bluetooth Optical Probe OP-740 consists of two parts: a Bluetooth optical probe and an Android library file for programmers and developers. By implementing this library file in the meter reading application, programmers will be able to easily establish a connection between the Bluetooth optical probe and their application. OP-740 is a two-way interface for transferring data compliant with the IEC62056-21 mode E and C and IEC62056-31 standard between the meter and the reading device, and if necessary, it can also communicate in Transparent mode. The information exchange between the probe and the meter is done through the optical port and the data is transferred to the Android device via Bluetooth wireless waves.


  • Resistant to ambient light
  • Bluetooth communication module to communicates with the device or meter reading software
  • With IEC62056-21c standard and ability to communicate with all meters with this standard
  • Ability to update Firmware via USB
  • Establish smart communication, protocol detection and meter reading
  • Transparent mode
  • High capacity built-in rechargeable battery
  • Easy charging via USB port
  • LED indicator lights
  • Strong magnet to keep the probe on the meter


  • Magnet power: More than 15 Newtons
  • Operating temperature: -10 ~ +65 oC
  • Weight: 87 gr
  • Body Material: Aluminum
  • Dimensions: 32 x 64.5 mm

Android meter data collection library capabilities

  • Implementation capability in projects with API21 and above
  • Communication with various meters having IEC, DLMS, Command Line, EURIDIS standards
  • Full Collection of public tariffs
  • Standard output in JSON format for all meters
  • Instantaneous voltage collection
  • Instantaneous current collection of meters
  • Collection of errors recorded in the meter
  • Encrypted definition the password of all meters
  • Ability to set the date and time of meters that have this feature
  • Return all errors that occurred during the meter reading operation
  • Upgrade and support all meters in future
  • With a complete guide for programmers and Sample Project

Electrical Specifications

  • IEC 62056-21 standard for optical port
  • Bluetooth 3.0 + EDR standard
  • Possibility to connecting with measurement devices according to IEC62056-21 (Mode C, E), IEC62056-31, DLMS, TRANSPARENT standards
  • Communication speed (baud rate) from 300 to 19200 bps
  • 3 LEDs for displaying battery charge
  • LED to display pair status, send and receive data
  • Lithium Ion 3.7V, 650mAh battery
  • ON/OFF switch
  • With USB Type C port for charging and communicating


  • Firmware updating via USB cable

Optical Data Transferring

  • Wavelength: 880nm
  • Lens type: Polycarbonate UV filter
  • Standard: IEC62056-21 mode C and E, IEC62056-31
  • Data transfer speed: Adjustable according to IEC2056-21 standard from baud rate 300 to 19200 bits per second

Communication platform

  • Communication platform: Bluetooth 3.0 + EDR
  • Bluetooth Class: Class 1 (Typical 7.5 dBm)
  • Bluetooth Maximum range: 10 m
  • Mode:
    • IEC62056-21 Auto Detection
    • DLMS/Cosem Auto Detection
  • Transparent mode: Yes
  • USB port: USB 2.0, Type C

Optical Filter

  • Sunlight Rejection: Yes
  • High Speed Echo Rejection: Yes
  • ECO filter: Yes

Battery and Power supply

  • Internal circuits current (idle): 18mA
  • Maximum current: 30mA
  • Built-in battery: Li-ion 3.7 V, 650 mAh
  • Standby (idle): 30 Hours
  • Continues working time: 18 Hours
  • Charging: 5 VDC, via USB port


  • Battery charger
  • Wristband