Function for reading DISCRETE INPUTS on modbus server by specifying unit ID.
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i32 mbcu_read_discr_inp (i32 mbc, i32 unitID, i32 offsDIStart, i32 nDI, dest)
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Handle value returned by mbc_init()
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Value of the unit ID to be used
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Initial index of the DISCRETE INPUT
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Number of DISCRETE INPUTS to be read from offsDIStart
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Area where to put the read data.
Can be i16/u16/i32 or array of i16/u16/i32
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Returns:
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0 [MBC_OK]
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Command executed
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-1 [MBC_INVAL]
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Invalid arguments
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-2 [MBC_BUSY]
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Resource occupied
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-3 [MBC_PERM]
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Permission denied
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-4 [MBC_CONN]
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Connection failed
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-5 [MBC_NOBUFS]
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Buffer exhausted
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-6 [MBC_NOMEM]
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Insufficient memory
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-7 [MBC_TX_ERR]
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Transmission error
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-8 [MBC_RX_ERR]
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Receive error
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-9 [MBC_TIMEOUT]
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Blocking command timeout
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-10 [MBC_EXC_CODE_1]
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Response with exception 1 (function code not supported by server)
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-11 [MBC_EXC_CODE_2]
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Response with exception 2 (invalid address)
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-12 [MBC_EXC_CODE_3]
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Response with exception 3 (invalid quantity or value)
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-13 [MBC_EXC_CODE_4]
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Response with exception 4 (operation failed)
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-14 [MBC_WRONG_ANSWER]
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Invalid response
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-15 [MBC_INVAL_MBC]
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Invalid mbc id
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Task
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The function is blocking. Exits only when the task is completed
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