Bluetooth Optical Probe OP-740

With Android Meter Data Collection Library

Bluetooth Optical Probe OP-740


The OP-740 Optical Probe is an interface that communicates via infrared waves with a peripheral device such as an electricity meter, water meter, heat meter, gas meter or any other device that has an optical port on it. It has a small housing design that makes it robust with its aluminum and polycarbonate filter material. All devices that support the European standard IEC62056-21 (IEC 1107) Mode E & C and IEC62056-31 will work with this product. In addition, it has the ability to send settings for data transmission with all types of IEC meters in transparent mode.

OP-740 has a Bluetooth connection interface, which is suitable for tablets and mobile phones and all devices with Bluetooth connection availability. It also includes 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 benefits from a very strong magnet that firmly attaches the optical probe to the meter and is also resistant to external light influences other than the infrared wavelength. Installation and configuration instructions are included with the probe.

* Installation and configuration instructions are provided with the probe.


  • Ergonomic & User-friendly Housing Design
  • Android Library for developers
  • Powerful Magnet
  • Optical Filter
  • Compliant with IEC 62056-21 (1107) Mode E & C Standard
  • Compliant with IEC62056-31 Standard
  • Smart baud rate change in mode E and C
  • Transparent mode with selective frame and baud rate
  • High-capacity built-in rechargeable battery
  • USB type C Port
  • LED Indicator Lights

Ergonomic & User-friendly Housing Design

The housing is designed with ergonomics in mind for comfortable handling. The material of construction ensures both robustness and lightness. It provides substantial resistance against surface wear due to its prolonged usage with optical port devices and meters.

It’s worth noting that good material alone doesn’t guarantee high hardness. The housing shape significantly impacts probe hardness. We have developed optical probes to endure a drop from a distance of one meter in case it slips from the user’s grip.

Powerful Magnet

The head of the device boasts a powerful magnet hidden below the surface, allowing the probe to attach securely to the optical port. This eliminates the need for constant manual checking and ensures a secure connection to the device.

Caution: Due to the strong magnetic force of the probe’s magnet, please do not store it near electronic equipment as it may cause damage if stored for long periods. It can also result in malfunctions in any storage device, including hard drives, solid-state memories (such as flash memory and SSDs), RAM storage, and similar.

Optical Filter

To establish communication between two devices through an optical port, a specific wavelength is necessary. The wavelength employed should be within the range of 880 nm infrared light, which remains invisible to the human eye. The light filter integrated into this optical probe effectively screens all ambient light, negating any possible interference to ensure uninterrupted and efficient communication between both the devices.

Smart Baud Rate Change

At times, individual meters may initiate connections at lower baud rates, but transmit data at higher ones. The baud rate may also require adjustment in accordance with the rules and protocols governing specific meters. Moreover, different communication modes are necessary for various meter models, depending on the optical port characteristics. Our optical probes have the intelligent ability to modify the connection baud rate and communication mode in E and C, in accordance with the communication protocol’s demands.

LED Indicator Lights

Using a battery-powered Bluetooth device requires visual notifications for various operations and battery life. Our optical probes feature separate indicators for battery life and data transmission via Bluetooth or optical port. This provides accurate indications of the ongoing operation and also helps the inspector or meter reader to determine the remaining battery life.

 Mechanical specifications

  • Dimensions: Diameter 32mm, Height 64.5mm
  • Connector: USB standard “C” plug
  • Infrared filter: Against external light influences
  • ON/OFF switch
  • Weight: Complete assembly weighs a maximum of 87gr
  • Casing material: Aluminum, Infrared filter Polycarbonate

Environmental Specifications

  • Operating Temperature: -10°C to +65°C
  • Best Storage Temperature: +10°C to +20°C (due to battery)
  • Rugged: Meets the requirements of several tests, including those for thermal shock, humidity, water resistance, RF susceptibility, ESD, drop, random vibration, solar radiation, salt, fog, and low pressure.

Electrical Specifications

  • Compatibility: IEC 62056-21 (1107) Mode C & E standard
  • Compatibility: IEC62056-31 standard
  • DLMS/Cosem Auto Detection
  • Data Rate: from 300 to 19200 bit/s
  • Communication: Half duplex
  • Optical: 880nm bi-directional IR interface
  • Echo filter: Yes

Android meter data collection library capabilities

  • Implementation capability in projects with API21 and above
  • Communication with various meters that comply with IEC, DLMS, Command Line, and EURIDIS standards
  • Full collection of public tariffs
  • Standard JSON output 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 for meters with this feature
  • Return any errors that occurred during the meter reading operation
  • Upgrade and support all meters in the future
  • With a comprehensive guide for programmers and a sample project


  • Ability to update Firmware via USB
  • 3 LEDs for displaying battery charge level
  • LED display for pair status, send and receive data
  • USB Type C port for:
    • Charging
    • Communicating
    • Firmware updating

Bluetooth specifications

  • Bluetooth 3.0 + EDR, Class 1 (Typical 7.5 dBm)
  • Bluetooth Maximum range: 10 m

Battery and Power supply

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


  • Wristband