IPC@CHIP Modbus library – API Documentation

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int mbRTU_mst_wr_coils ( MbHandle  handle,
u8  slaveAddr,
u16  startAddress,
u16  quantity,
const u8 coilBuf,
u8 exception,
u32  timeoutMs 

Send a "write multiple coils" (0x0F) request and receive reply from the slave.

[in] handle : Handle returned by mbRTU_mst_init()
[in] slaveAddr : Slave address
[in] startAddress : Address of the first register
[in] quantity : Number of coils to write
[in] coilBuf : Buffer field contains the coil values to write.
  The coils must be packed as one coil per bit of the buffer field.
  A logical '1' in a bit position of the field requests the corresponding output to be ON.
  A logical '0' requests it to be OFF.
[out] exception : Exception code (see ModbusExceptionCodes).
[in] timeoutMs : Wait max. timeout in [ms] for a reply from the slave*

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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