BT578_V3:RS232 Bluetooth Adapter

BT578_V3: RS232 Bluetooth adapter

User Guides

Applications

Android APP

Serial Program

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Introduction

BT578 Serial Bluetooth adapter is usually connected to a RS232 serial communication device by the DB9 serial port, and then connected to a computer or mobile phone via Bluetooth SPP or BLE, thus build a wireless bridge between the serial device and the computer or mobile phone. It can eliminate your conventional RS232 serial cables, connects communication both sides over the air, provides a wireless serial connection with more freedom and convenience.

Key Features

• Supports Classic Bluetooth Serial Port Profile(SPP) and new generation Bluetooth LE(BLE).
• AT commands can be sent via Bluetooth link to personalize Bluetooth name, serial baud rate, etc..
• Lower power consumption than BT578_V2, but longer communication distance.

• Use the current popular USB Type-C connector for Power supply and charging.
• Can be connected to female or male serial device by DB9 connector or gender changer.
• A green LED is used to indicate TX/RX activity of RS232 serial communication.
• Supports Pin 9 power supply, just connect pin9 to 5V and pin5 to GND.
• Built-in battery and charging circuit, more than 36 hours battery usage time.

Specifications

• Standard: Bluetooth v3.0(SPP) + Bluetooth v4.2(BLE)
• Selectable Serial Baud Rate: 1200,2400,4800,9600,19200,38400,57600,115200 bps
• Serial Communication BLE Characteristic: 0000ffe1-0000-1000-8000-00805f9b34fb
• Typical Bluetooth Coverage: 30 meters (line of sight)
• TX Power: 5dBm
• RX Sensitivity: -95dBm
• Typical working Current: 8 mA
• Dimension and Weight: 78x34x16mm 30g

FAQs

Q1: What is Bluetooth SPP and what is Bluetooth BLE, and what is the difference?
A1: Bluetooth SPP is the abbreviation of Serial Port Profile. SPP is a protocol of traditional Bluetooth, which can virtualize Bluetooth link into a serial connection.
Bluetooth BLE is the abbreviation of Bluetooth Low Energy. BLE is a relatively new Bluetooth technology that came with the release of Bluetooth 4.0.
There are several differences between the two protocol:
1. Different user interfaces: The user interface provided by SPP is a Bluetooth virtual serial COM port; the user interface provided by BLE is a Bluetooth characteristic.
2. Different communication target: SPP is usually used to connect to Windows computer (Android can also support SPP); BLE is usually used to connect to Android or iOS devices.
3. Different applications: The application program of serial device can still be used over Bluetooth SPP connection; while the Bluetooth characteristic provided by BLE usually require new program development.

Q2: BT578, BT578_V2, BT578_V3, what is the difference between these models?
A2: This is the BT578 serial Bluetooth adapter model in different periods, BT578 is the earliest version, BT578_V2 replaced BT578 in 2021, and BT578_V3 replaced BT578_V2 in 2023.
If you are using the discontinued BT578 or BT578_V2 adapter, please click on the link below to download the correct user guide.
BT578 User Guide: http://www.irxon.com/english/578/BT578_EN.pdf.
BT578_V2 User Guide: http://www.irxon.com/english/578/BT578_V2_EN.pdf.

Q3: I bought a BT578 adapter, the model on the adapter label is BT578_V31, What is the difference between BT578_V31 and BT578_V3?
A3: BT578_V31 is still BT578_V3, but BT578_V31 has made a firmware upgrade to support sending AT commands via a Bluetooth connection to change communication parameters such as serial baud rate.

Q4: I bought a BT578_V3 Bluetooth adapter, but I can not find right AT commands to scan for other SPP and BLE devices or command to connect via MAC address?
A4: BT578_V3 is a Bluetooth slave device, it can't scan for other Bluetooth devices and connect via MAC address.
Our another product, BT579 serial Bluetooth adapter, can act as a master role and connect to slave devices.

Package Contents

• BT578_V3 Serial Bluetooth adapter x1
• DB9 male to female gender changer x1
• USB to Type-C power/charging cable x1
• User Guide (Electronic edition, click to download)