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Idiomas disponibles
TECHNICAL MANUAL
LARGE DISPLAYS DN109/NB - DN119/NB - DN189/NB - DN129/NB
CHAPTER 24
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Read Holding Registers: Allows you to view the content of the desired registers.
The structure of this function is presented below:
Request
Function code
Start address
Number of registers
Answer
Function Code
Number of bytes used
Register Value
Error
Error Code
Exception Code
Table 64: "Read Holding Registers" function structure.
Example:
We want to read two registers with the contents "1234" and "5678", they are located at addresses
1 and 2. To do this, the following frames are sent and received:
ETHERNET COMMUNICATION
1 Byte
2 Bytes
2 Bytes
1 Byte
1 Byte
N x 2 Bytes
1 Byte
1 Byte
03h
0000h to 0011h
0001h to 0012h
01h
2 x N (N = # registers)
XX...XX
83h
01 or 02 or 03 or 04
24-6
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