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Function for reading INPUT REGISTER specified on modbus server.

Syntax

i32 mbc_read_inp_reg (i32 mbc, i32 offsIRStart, i32 nIR, i32 endian, dest)

mbc

Handle value returned by mbc_init()

offsIRStart

Initial index of the INPUT REGISTER

nIR

Number of INPUT REGISTER to be read

endian

Type of endian to be used:

Value

Meaning

0 [EM_B_16]

Big Endian in the single word. (default)

1 [EM_L_16]

Little Endian in the single word

2 [EM_B_32]

Big Endian in 32 bits

3 [EM_L_32]

Little Endian in 32 bits

4 [EM_MB_32]

Middle Big Endian in 32 bits

5 [EM_ML_32]

Middle little Endian in 32 bits

6 [EM_B_64]

Big Endian in 64 bits

7 [EM_L_64]

Little Endian in 64 bits

8 [EM_MB_64]

Middle Big Endian in 64 bits

9 [EM_ML_64]

Middle little Endian in 64 bits

dest

Area where to put read data.

Can be i16/u16/i32/float/real or array of i16/u16/i32/float/real

Result

Returns:

Value

Meaning

0 [MBC_OK]

Command executed

-1 [MBC_INVAL]

Invalid arguments

-2 [MBC_BUSY]

Resource occupied

-3 [MBC_PERM]

Permission denied

-4 [MBC_CONN]

Connection failed

-5 [MBC_NOBUFS]

Buffer exhausted

-6 [MBC_NOMEM]

Insufficient memory

-7 [MBC_TX_ERR]

Transmission error

-8 [MBC_RX_ERR]

Receive error

-9 [MBC_TIMEOUT]

Blocking command timeout

-10 [MBC_EXC_CODE_1]

Response with exception 1 (function code not supported by server)

-11 [MBC_EXC_CODE_2]

Response with exception 2 (invalid address)

-12 [MBC_EXC_CODE_3]

Response with exception 3 (invalid quantity or value)

-13 [MBC_EXC_CODE_4]

Response with exception 4 (operation failed)

-14 [MBC_WRONG_ANSWER]

Invalid response

-15 [MBC_INVAL_MBC]

Invalid mbc id

Validity

Task

Note

The function is blocking. Exits only when the task is completed

 

  

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