Omron CS1W-ETN21 operation manual Opening Problems, Closing Problems, Refer to General Problems on

Troubleshooting Procedures Section 8-4

Opening Problems

Opening Problems occurred.

N	Are you attempting
	an active open?
	Y
	Is the passive open
	not finishing?
	N

Y

Use an active open at the remote node.

Is the response	N	Read socket status using
code in the results storage		the FINS command READ
area a value other		SOCKET STATUS.
than 0049?
Y
		Does the port		Y
		number being used exist
		at the local node?
			N

Return to General

Problems.

Make sure that the same port number is not being used simultaneously by more than one process, including FTP services. Sockets can remain in ESTABLISHED or some later status even if closed; be sure to close ports from both sides of the connection.

A socket can remain open in TIME WAIT status for up to one minute on the side that closes the socket first; we recommend that the active-side port number be set to 0 and that you close the socket from the active side. If you are using the Socket Service Request Switches, check the response code to see if it is 0049 Hex.

Closing Problems Refer to General Problems on page 214.

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