Varec 4000 manual Character Data

4000 Modbus Implementation

9.5.2Integer Data

•Hexadecimal representation

•4124Decimal equivalent: 16,676

The data returned for data address 56 is 16,676 (4124 Hex). This value must be scaled using the following formula to give it meaning.

If a variable goes out-of-bounds (outside the minimum or maximum scale points), a value equal to the maximum Modbus integer + 1 is returned. Writing to dynamically calculated parameters has no effect on those parameters.

9.5.3Character Data

Character data, such as software version, are returned in registers in ASCII data format. Each Modbus register represents two ASCII characters.

The following communication example shows the character data "ATT-" read from the ATT.

Host Request
Address	Function	Start Reg	Start Reg	# of Reg	# of Reg	Error
	Code	H	L	H	L	Check
01	03	00	1E	00	02	XX
ATT Response
Address	Function	Byte	Data	Data	Data	Data	Error
	code	Count	MSB	LSB	MSB	LSB	Check
01	03	04	41	54	54	2D	XX

•Hexadecimal representation 41 54 54 2D

•ASCII representation: ATT-

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