ClosePort - method of object PmComm

Close the serial/ethernet communication port of this object.
ClosePort As Boolean
Return Values:
true - Port has been successfully closed.
false - The port was not closed. Possible cause: The port was not open before or is still being opened (for Ethernet the connection process may take more time and during this period the port cannot be closed)
for serial link: This method closes, for example the port COM1 (COM2 ..) and then this serial port can be used for communication with other object or other application. In ordert continue the transfer through this object the OpenPort method must be called. See Settings of the serial link parameters.
for Ethernet: The TCP connection is closed by this method. It is useless to call this method for UDP transfers. After the connection is closed: in order to continue the transfers on the same TCP address and port it is NOT necessary to call the OpenPort method, because the connection is opened automatically before the new transmission starts. See Settings of the Ethernet parameters.
PROMOTIC 8.3.30 SCADA system documentation - MICROSYS, spol. s r.o.

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