IPC@CHIP Modbus library – API Documentation

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int mbRTU_mst_rd_regs ( MbHandle  handle,
u8  slaveAddr,
u8  functionCode,
u16  startAddress,
u16  quantity,
u16 registerData,
u8 exception,
u32  timeoutMs 

Send a "read multiple registers" request 03h or 04h and receive reply from the slave.

[in] handle : Handle returned by mbRTU_mst_init()
[in] slaveAddr : Slave address
[in] functionCode : 03h or 04h
[in] startAddress : Address of the first register
[in] quantity : Number of registers to read
[out] registerData : User provided storage, contains register values read
[in] timeoutMs : Wait max. timeout in [ms] for a reply from the slave
[out] exception : Exception code (see ModbusExceptionCodes).

0 : Execution successful, check *exception for possible exception code.
-1 : Communication timeout receive
-2 : Received garbage (CRC error)
-3 : Unable to send request
-8 : Illegal parameter

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