Serial communication API

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• hb_comClose(<nPort>) ➜ lSuccess
  closes (the handle of) <nPort> invalidating any pending communication process. should be invoked upon finishing working with that com port.

• hb_comDiscardChar(nPort, nChar|cChar) ➜ lSuccess

• hb_comErrorChar(nPort, nChar|cChar ) ➜ lSuccess

• hb_comFindPort(<cDeviceName> [,<lCreate> = .F.]) ➜ nPort

• hb_comFlowChars(nPort, nXONchar|cXONchar, nXOFFchar|cXOFFchar) ➜ lSuccess

• hb_comFlowControl(nPort, @nOldFlow [,nNewFlow]) ➜ lSuccess

• hb_comFlowSet(nPort, nFlow) ➜ lSuccess

• hb_comFlush(nPort, [ nType = HB_COM_IOFLUSH ] ) ➜ lSuccess

• hb_comGetDevice(nPort) ➜ cDeviceName

• hb_comGetDeviceHandle(nPort) ➜ nHandle | F_ERROR

• hb_comGetError(nPort) ➜ nError

• hb_comGetOSError(nPort) ➜ nError

• hb_comInit(nPort, nBaud, cParity, nSize, nStop) ➜ lSuccess

• hb_comInputCount(<nPort>) ➜ nCount
  returns the number of bytes currently (but not yet read) in input buffer of <nPort> or -1 on error.

• hb_comInputState(nPort) ➜ nState

• hb_comLastNum() ➜ nLastPortNumber

• hb_comLSR(nPort, @nValue) ➜ lSuccess

• hb_comMCR(nPort, @nValue, nClear, nSet) ➜ lSuccess

• hb_comMSR(nPort, @nValue) ➜ lSuccess

• hb_comOpen(nPort) ➜ lSuccess
  opens com port specified by <nPort> and returns .T. on success or .F. on failure.

• hb_comOutputCount(<nPort>) ➜ nCount
  returns the number of bytes currently (remaining to be transmitted) in output buffer of <nPort> or -1 on error.

• hb_comOutputState(nPort) ➜ nState

• hb_comRecv(nPort, @cBuffer, [nLen = Len(cBuffer)], [nTimeout = 0]) ➜ nBytesRecv

• hb_comSend(nPort, cBuffer, [nLen = Len(cBuffer)], [nTimeout = 0]) ➜ nBytesSent

• hb_comSendBreak(nPort, [nDuration = 50]) ➜ lSuccess

• hb_comSetDevice(nPort, cDeviceName) ➜ lSuccess

• hb_comSetError(nPort, nError) ➜ NIL

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