SysComRead (FUN)

FUNCTION SysComRead : UDINT

<description>Reads the number of bytes from the receive buffer of the specified device. <p>IMPLEMENTATION NOTE: If the timeout elapsed until the requested number of bytes are received,

the function returns the number of bytes already received! This must be considered in the caller and the implementation!</p></description>

<result><p>RESULT: Number of actual read bytes</p></result>

InOut:

Scope	Name	Type	Comment
Return	SysComRead	UDINT
Input	hCom	RTS_IEC_HANDLE	<param name=”hCom” type=”IN”>Handle to com port</param>
	pbyBuffer	POINTER TO BYTE	<param name=”pbyBuffer” type=”IN”>Pointer to data buffer for received data</param>
	ulSize	UDINT	<param name=”uiSize” type=”IN”>Requested number of bytes to read. Must be less or equal the size of the receive buffer!</param>
	ulTimeout	SYS_COM_TIMEOUT	<param name=”ulTimeout” type=”IN”>Timeout in milliseconds to read data from the device. [0]=Immediate return. If the timeout elapsed, the function returns with the still received data (could be less then the requested number of bytes!)</param>
	pResult	POINTER TO RTS_IEC_RESULT	<param name=”pResult” type=”OUT”>Pointer to return the runtime system error code (see CmpErrors.library).</param>