---
title: Technical Specifications
weight: 2
---

## Scope of Application

These Technical Specifications (TS) establish the minimum requirements for the design, assembly, testing, and packaging of the IoT device VADTel-AIoTU5, intended for:

- Remote monitoring of utility meters (electricity, gas, water).
- Data transmission via GSM/GPRS networks based on the SIM800C module.

The device is designed for operation as part of IoT systems under conditions specified in these TS and EU directives.

## References to Standards and Directives

- **RED Directive 2014/53/EU**
  - ETSI EN 301 511 V12.5.1 (radio frequency characteristics).
  - EN 62311:2020 (limits of electromagnetic exposure).
- **RoHS Directive 2011/65/EU**
  - EN IEC 62321 (restriction of hazardous substances).

Test reports and certificates provided by laboratories:

- **RED** Certificate: LGAI Technological Center, S.A. (APPLUS), No.: 0370-RED-5126.
- **RF** Test Report: SHE24050058-01CE.
- **MPE** Test Report: SHE24050058-01DE.
- **RoHS** Test Report: SHAEC1906738501.

## Manufacturing Process

### PCB Assembly

- The board is manufactured in compliance with RoHS requirements and IPC-A-610 Class 2 standards.
- The SIM800C module is installed on the PCB using automated or manual assembly processes.

### Firmware Installation

- The microcontroller firmware is programmed via a dedicated connector.
- The firmware must ensure:
  - Initialization of the SIM800C GSM module.
  - Support for MQTT and HTTP/HTTPS protocols.
  - Connection test with the server.

### Final Assembly

- The PCB is inserted into a plastic housing.
- A lithium-ion battery (capacity from 1000 to 6000 mAh) is connected to the PCB via a connector.
- The housing is closed and secured with two screws.

![Final assembly](./images/assembly.gif)

## Quality Control

### Functional Testing

- GSM connection testing:
  - The device's connection to the server via GSM900/1800 is tested.
  - Successful tests are recorded in the production log.

### Visual Inspection

- The device is inspected for housing integrity, secure attachment of screws, and proper battery connection.

### Compliance Testing with EU Directives

- Electromagnetic compatibility (EMC) tests.
- Radio frequency emission (RF) measurements.
- Electromagnetic exposure (MPE) evaluation.

## Performance Characteristics

### Frequency bands and power

- GSM 900: 880-915 MHz, maximum power 33.48 dBm.
- GSM 1800: 1710-1785 MHz, maximum power 30.61 dBm.

### Operating conditions

- Temperature: from −30 °C to +60 °C.
- Humidity: up to 98% (non-condensing).
- Protection class: IP54 (IEC 60529).

### Power supply

- Voltage: from 3.4 V to 4.2 V.
- Battery: lithium-ion, capacity 1,000–6,000 mAh.

## Marking and Packaging

### Marking

- The device is labeled as follows:
  - IMEI number (barcode).
  - Serial number.
  - CE marking.

### Packaging

- Each device is packed in an individual cardboard box.
- The box contains:
  - The device with an installed battery.
  - Device passport.
  - Declaration of Conformity.

## Documentation

The production log must include:

- Serial number and IMEI of the device.
- Results of GSM connection tests.

Supplied documentation:

- EU Declaration of Conformity.
- Certificates for the SIM800C module.

## Revision History

| Version | Date       | Changes                |
| ------- | ---------- | ---------------------- |
| 1.0     | 2025-01-21 | Initial release of TS. |