Modbus RTU MP3 Siren Speaker Audio Alarm Horn for Industrial Control Systems 30W Horn Speaker with Built-in MP3 Player (FN-A503-Modbus)

Features

1. Adopts Modbus RTU standard communication protocol.

2. Rugged and durable 30 watts siren horn speaker.

3. Red body is made of metal and black tail is made of ABS plastic.

4. Built-in a high quality MP3 audio player sound board.

5. Built-in 8MB flash memory and supports max. 8 minutes long MP3 files of 128Kbps.

6. Able to replace audio files via USB connection to computer.

-The internal memory of the device will be directly detected as a USB flash drive on computer. No need any auxiliary software.

7. Equipped with a micro SD slot in the internal circuit board and possible to use a micro SD card as well.

8. Supports max. 32GB micro SD card (FAT32 preferable).

9. Able to set different communication baud rates (2400/4800/9600/19200/38400/57600/115200/256000/35250).

10. Able to adjust sound volume through sending the relevant serial commands.

11. Industry-grade design and strong anti-jamming capability.

Product parameters

1. Working voltage: DC 12V-24V

2. Working current: ≥3000mA (@12V)

3. Standby current: ≤10mA

4. Power consumption: ≤30W

5. Internal flash memory size: 8MB

6. Audio format: MP3 (≤192 Kbps)

7. Frequency response: 1000Hz-25KHz

8. Sound intensity: ≤125dB

9. Protection class: IP65

10. Cable length: 50cm

Dimensions

Internal Circuit Board

Usually you don’t need to take the device apart, unless you need to use an extra micro SD card or adjust the blue volume potentiometer. After you remove the back cover, you can see the internal circuit board as below.

Notes

1). When you use a micro SD card, we suggest you format it to FAT32 first on computer before copying audio files into it.

2). When you use a micro SD card, you need to set the master to send the relevant command to specify the micro SD card as the storage device first.

3). By default, we already adjusted the volume potentiometer to output approx. 90% of the volume, so basically you don’t need to adjust it any more. If necessary, you can use a small cross screwdriver to turn it clockwise to increase volume or turn it anticlockwise to decrease volume. Also you can directly send the relevant commands to adjust the volume via the master device.  

Wiring Example

This wiring example shows that the device is connected to a computer via a USB to RS485 converter.Running a serial debugging software on computer, users can debug and test the device easily before applying it to a control system. When it is connected to a PLC or an industrial controller, in the same way, the yellow wire from the siren is connected to the RS485 communication port A (+) of the PLC/industrial controller, while the green wire is connected to the RS485 communication port B (-).

Serial Communication

This product adopts Modbus RTU serial communication protocol based on RS485, and the default baud rate is 9600. Because of its binary representation and compact data structure, Modbus RTU has high communication efficiency and it is widely used in industrial occasions. 

Factory default parameters for the device:

Default device address: 01

Default volume level: 30 (maximum)

RS485 wiring: Yellow A +/ Green B - 

RS485 communication settings:

Baud rate: 9600 (default)

Data bits: 8Stop bits: 1

Parity: None

Flow control: None 

Communication format

Addr: slave address(device address)

Fun: function code

Data start reg hi: data start address-register high byte

Data start reg lo: data start address-register low byte

Data #of reg hi: number of data read-register high byte

Data #of reg lo: number of data read - register low byte

CRC16_H: Cyclic redundancy check high byte

CRC16_L: Cyclic redundancy checklow byte

Command format: [ address code ] + [function code] + [high 8 bits of register address] + [low 8 bits of register address] + [high 8 bits of data] + [low 8 bits of data] + [low 8 bits of check code] +[high 8 bits of check code]