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 SerReceive
 Receive data
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 Syntax

    SerReceive(<nPort>, <nCount>) -> cData

 Parameters

    <nPort> is a serial port number.

    <nCount> is the maximum number of characters to receive.

 Returns

    SerReceive() returns the string of data received.  On error it returns
    an empty string, with an error number in F2Error().  If less than the
    amount of data requested is available, SerReceive() returns only what is
    available.