Handheld Ultrasonic Sensor Using RS485 Interface And Modbus Protocol For Underwater Ranging And Depth Measurement

Portable ultrasonic depth sounder KWD100

1. Product introduction

The portable ultrasonic detector KWD100 is a handheld terminal computer developed for portable carrying and measurement. It is light in appearance, durable in structure, easy to operate, simple, and intuitive, which greatly improves work efficiency and user experience, and can be adapted to use in various environments.

This product is based on the principle of ultrasonic ranging and can realize underwater ranging and underwater depth measurement functions. The feature of this product is that it can use the transducer attached to the machine for depth measurement; it can also be used for external power supply and external communication. The company's various ranging sensors or transducers carry out corresponding ranging work. The parameters of each ultrasonic transducer are different to cope with different occasions. This product can read the signal waveforms of the transducer and sensor, which is convenient for personnel to make relevant judgments.

2. Appearance introduction

● Switch: used to turn on and off the handheld terminal

● Transducer connector: used to connect various types of ultrasonic transducers

● Sensor connector: used to connect various types of ranging sensors

● Voltage adjustment knob: used to adjust the voltage of the output power supply (~12~24V)

● Key input: used for device interaction

● LCD screen: displays various values and graphics

● Anti-lost hand strap: hang on your hand to prevent falling

3. Parameter performance

Ultrasonic sensor parameters:

Host computer parameters:

4. Agreement Description

port parameters

The hardware adopts RS-485, master-slave half-duplex communication, the host calls the slave address, and the slave responds to the communication

Data frame: 10 bits, 1 start bit, 8 data bits, 1 stop bit, no parity;

Baud rate: 9600 19200 38400 115200 (default 115 200).

Reading a single register

Function code: 03H

1st byte ADDR: slave address code (0x01~0xFE);

Byte 2 03H: function code;

Bytes 3 and 4: the starting register address to be read;

Bytes 5 and 6: The number of registers to be read, reading a single register is 0x0001;

Bytes 7 and 8: CRC16 check code from byte 1 to byte 6.

1st byte ADDR: slave address code (0x01~0xFE);

Byte 2 03H: function code;

Byte 3: The total number of data bytes received. If a single register is read, the total number of bytes is 02;

Bytes 4 and 5: register data, each data occupies 2 bytes;

Bytes 6 and 7: CRC16 check code from byte 1 to byte 5.

Reading multiple registers

Function code: 03H

Refer to the method of reading a single register. When reading distance and temperature at the same time, the number of registers is 0x0002;

Referring to the method of reading a single register, data 1 is the starting register value to be read. Each data occupies 2 bytes. The number of data is returned according to the number of registers read by the user.

Write a single register

Function code: 06H

1st byte ADDR: slave address code (0x01~0xFE);

Byte 2 06H: function code;

Bytes 3 and 4: the written register address;

Bytes 5 and 6: register data corresponding to the register address;

Bytes 7 and 8: CRC16 check code from byte 1 to byte 6.

1st byte ADDR: slave address code (0x01~0xFE);

Byte 2 06H: function code;

Bytes 3 and 4: the written register address;

Bytes 5 and 6: register data corresponding to the register address;

Bytes 7 and 8: CRC16 check code from byte 1 to byte 6.

1st byte ADDR: slave address code (0x01~0xFE);

The second byte 83H or 86H: function code (83H means an error is reported for the read command, 86H means an error is reported for the write command);

Byte 3: Reference error message code table ;

Bytes 4 and 5: CRC16 check code from byte 1 to byte 3.