Varec Network Adapter 4000, Инструкция по установке и эксплуатации, Страница: 61 / 80

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4000 Modbus Implementation
9.5.2 Integer 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 i 1 is returned. Writing to dynamically
calculated parameters has no effect on those parameters.
9.5.3 Character 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.
•
Hexadecimal representation 41 54 54 2D
•
ASCII representation: ATT-
Host Request
Address
Function
Code
Start Reg
H Start Reg
L # of Reg
H # of Reg
L Error
Check
01 03 00 1E 00 02 XX
ATT Response
Address
Function
code
Byte
Count
Data
MSB Data
LSB Data
MSB Data
LSB Error
Check
01 03 04 41 54 54 2D XX