Using the same example shown above to request registers 40108 to 40110 from slave address 17.
11 03 00 6B 00 03
The complete ASCII request is made by first adding the message delimiting characters. A colon is added to the start of the message, the LRC, carriage return and line feed are added to the end:
: 1 1 0 3 0 0 6 B 0 0 0 3 7 E CR LF
Each character is now treated as an ASCII character and replaced with it's hex value to give the final message.
3A 3131 3033 3030 3642 3030 3033 3745 0D 0A
This Modbus ASCII request size is 17 bytes (170 bits)
ASCII码英文全称America Standard Code for Information Interchange，中文意思：美国信息交换标准码。它已被国际标准化组织（ISO）定为国际标准，称为ISO 646标准。适用于所有拉丁文字字母，ASCII码有7位码和8位码两种形式。ASCII码于1968年提出，用于在不同计算机硬件和软件系统中实现数据传输标准化，在大多数的小型机和全部的个人计算机都使用此码。ASCII码划分为两个集合：128个字符的标准ASCII码和附加的128个字符的扩充和ASCII码。
你搞清ASCII码是什么意思就全明白了
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