Led serial communication

screen setting

Set up ---- screen setting


The password is 168
Small screen width and height Calculate （44）
Width 324=128
Height 16*4=64

attachment

232 Lines should cross

E3L Control card （ Male head ）-----232 Wiring female ---- Development board stm32 explorer COM2

As you can see from the picture above com2 The corresponding is P9,P9 Connect with serial port （ch340）



Select serial port in screen settings

Download font

gb2312 Can display Chinese , The width depends on how many words you want to display Screen width / Character width = Show the number of words
The height depends on how many lines you want to display Screen height / character height = Display row number

Click send in the upper right corner to indicate that the connection is ok . Note that if the serial port is not closed, the communication will fail .

Serial port communication

Choose the characters

For example, to id by 2 Send in the area of Show immediately yellow （ monochrome p10 Invalid ）Led Show 5.3

Instructions ：78 34 01 00 29 12 F2 00 00 00 00 00 00 18 00 02 00 01 02 00 03 10 00 00 4C 00 65 00 64 CF D4 CA BE 00 35 00 2E 00 33 31 D3 A5
explain ：78、34 It is fixed as shown below
0100 It represents the screen address 1, Two bytes high followed , You can see in the screen settings
29 yes cmd command , Represents string update You can find it in the second picture below
ident and frame Invalid , Random filling , in total 8 Bytes
18 00 Is the length of the following data , Two bytes 18（ Hexadecimal ）=16+8（ Decimal system ） The blue part
data Look at the third picture below 02 00 Is the character partition id3, Two bytes 01 representative gb2312 code 02 The delegate immediately displays 00 Represents string index , Immediately show that it doesn't matter ,03 On behalf of yellow , Here is monochrome invalid ,10 00（ The conversion to decimal is 16） Is the character length ,Led Show 5.3, Each Chinese character or English occupies two bytes 8*2=16
Led Show 5.3 Convert to hex , English is a byte that needs to be supplemented , Chinese will be converted into two bytes , Refer to the fourth figure below for details 00 4C 00 65 00 64 CF D4 CA BE 00 35 00 2E 00 33
31· D3 It's the check code , Input the previous data , choice ModbusCRC16 On the right is the check code
A5 The is terminator is fixed

Tools to address ：https://www.23bei.com/tool-54.html#