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Table 4.4.: Modbus data types

Modbus Type	Server Data Type		Size	Access Rights
discrete input	bool		fixed	Read-Only
coil	bool		fixed	Read-Write
input register	uint16		fixed	Read-Only
input register	int16		fixed	Read-Only

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Table 4.4.: Modbus data types

Modbus Type	Server Data Type	Size	Access Rights
input register	uint32	fixed	Read-Only
input register	int32	fixed	Read-Only
input register	float	fixed	Read-Only
input register	double	fixed	Read-Only
input register	bool	fixed	Read-Only
input register	time	fixed	Read-Only
input register	string	1 – 246	Read-Only
input register	wstring	1 – 123	Read-Only
holding register	uint16	fixed	Read-Write
holding register	int16	fixed	Read-Write
holding register	uint32	fixed	Read-Write
holding register	int32	fixed	Read-Write
holding register	float	fixed	Read-Write
holding register	double	fixed	Read-Write
holding register	bool	fixed	Read-Write
holding register	time	fixed	Read-Write
holding register	string	1 – 246	Read-Write
holding register	wstring	1 – 123	Read-Write