Modbus软件开发实战指南之开发自己的Modbus Poll工具 - 4 Modbus

说到mobus，其寄存器的结构非常特殊，16位的，
【Modbus软件开发实战指南之开发自己的Modbus Poll工具 - 4】这种情况下，有很多初学者犯憷，不知道如何处理了。
特别是对于float，double等类型的，
发送数据，接收数据都很难办。怎么学习modbus开发呢？除了前面推荐的清华出版的书籍之外，
现在推荐一个非常好用的工具：
http://www.binaryconvert.com/
提供各种数据类型的16进制和十进制之间的转换：

Online Binary-Decimal Converter

This converter allows you to convert numbers from decimal format to binary format and from binary format to decimal format. It supports the main variable data types used in most programming languages. It also floating point numbers (single and double precision) according to the standard IEEE754. Supported types are shown in the following table:

	TYPE	BITS	MINIMUM	MAXIMUM	DECIMAL FORMAT

文章图片	Unsigned char	8	0	255	Integer

文章图片	Signed char	8	-128	127	Integer

文章图片	Unsigned short	16	0	65535	Integer

文章图片	Signed short	16	-32768	32767	Integer

文章图片	Unsigned int	32	0	4294967295	Integer

文章图片	Signed int	32	-2147483648	2147483647	Integer

文章图片	Float (IEEE754)	32	-3.4028E+38	3.4028E+38	Real number

文章图片	Double (IEEE754)	64	-1.7977E+308	1.7977E+308	Real number

How to convert from decimal to binary?

文章图片	Enter the number in decimal form in the corresponding field. For floating-point numbers, the following formats are valid: 128001.5766 1.280015766E5	文章图片

文章图片	The result is shown on the next page both in hexadecimal and in binary. Each bits is represented by a square (green = 1, gray = 0). The closest decimal value that can be represented by this binary expression is also shown in the field "Most accurate representation".	文章图片

How to convert from binary to decimal?

文章图片	Enter the number in hexadecimal form or in binary form in the corresponding field.	文章图片

文章图片	A bit can be toggled by clicking on the corresponding square.	文章图片

文章图片	The decimal value is shown. For display purpose, the number of figures is limited to 30. However, all computations are performed with full precision without any rounding.	文章图片