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Function for reading COILS on a modbus server via support structure in pass-through mode.

Syntax

i32 mbc_read_coils_s (i32 mbc, stru_modbus stru, dest)

mbc

Handle value returned by mbc_init()

stru

Structure of type stru_modbus containing the parameters

dest

Area where to put the read data.

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

Result

Returns:

Value

Meaning

1 [MBC_WAIT]

Command waiting for response

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 pass-through. As long as it returns MBC_WAIT, it must be continuously called within the task

 

  

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