IPC@CHIP Modbus library – API Documentation

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int mbTCP_cl_wr_single_coil ( MbHandle  handle,
u8  unitId,
u16  startAddress,
u16  coil,
u8 exception,
u32  timeoutMs,
int *  errorCode 

Send a "write single coil" request 5 and receive the reply from the server.

[in] handle : Handle returned by mbTCP_cl_init()
[in] unitId : Unit identifier
[in] startAddress : Address of the coil
[in] coil : Bit value to write (coil==0x0000: value OFF, 0xFF00 == ON)
[out] exception : Exception code (see ModbusExceptionCodes).
timeoutMs : Wait max. timeout in [ms] for a reply.
[out] errorCode : TCP/IP Socket API error code
0 : Execution successful, check *exception for possible exception code.
-1 : Timeout, no reply received
-2 : Received garbage (invalid Modbus frame data)
-5 : TCP socket fault, see errorCode

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