Serial string Send data

When using the serial port to send data, you can choose to send the string or hex send , usually we used to choose string to send data. About the difference between the two, you need to store data from the computer format.

In a computer, data is stored in binary form, such as decimal 1 (10), which is represented by 0000 0001 (2) in the computer. When we send data using the serial port, we first convert the data to the corresponding ASCII code, and then send the ASCII code in a binary way.

For example, we want to send a string of data "a852010100000000a91a", sent in both strings and hexadecimal:

(1) string send

The serial port sends the data as a string, first converting the string to binary, in the following format:

          0000 1010     0000 1000    0000 0110    0000 0010    0000 0000& nbsp;  0000 0001    0000 0000     0000 0001  

A 8 5 2 0 1 0 1

          0000 0000     0000 0000   0000 0000    0000 0000     0000 1010    0000 1001    0000 0001    0000 1010

                           0                    0                      0                    0                     A                    9                    1                    A

The data is then sent in the form of a 8-bit (serial port setting data bit 8-bit).

The data format received by the serial port is as follows

Number	Data content	Number	Data content
0	A	8	0
1	8	9	0
2	5	10	0
3	2	11	0
4	0	12	A
5	1	13	9
6	0	14	1
7	1	15	A

(2) Hex Send data

The serial port sends the data in hexadecimal, first turning the data into:

          1010 1000     0110 0010    0000 0001     0000 0001     0000 0000    0000 0000     1010 1001     0001 1010

0xa8 0X52 0x01 0x01 0x00 0x00 0xa9 0 X1a

The data is then sent in the form of a 8-bit (serial port setting data bit 8-bit).

The data format received by the serial port is as follows:

Number	Data content	Number	Data content
0	A8	4	00
1	52	5	00
2	01	6	A9
3	01	7	1 A

It is easy to understand the difference between string sending and hexadecimal sending by carefully comparing the received results.

Serial string Send data