W3150 Datasheet, PDF (37/59 Pages) List of Unclassifed Manufacturers – WIZnet’s Online Technical Support

ESTABLISHED : CLOSED ?
No connection state at all. It can be checked as below,
Check if DISCON value of Socket n Interrupt Register(Sn_IR) is ‘1’. (In this case if the interrupt of
Socket n is activated, interrupt occurs. Refer to Interrupt Register (IR), Interrupt Mask Register
(IMR), Socket n Interrupt Register (Sn_IR).)
Or Check if the value of Socket n Socket Status Register(Sn_SSR) is SOCK_CLOSED.
ESTABLISHED : Timeout
In case that connection is closed due to the error of remote peer during data receving or connection
closing process, data transmission can not be normally processed. At this time Timeout occurs after
some time.
1. Check if TIMEOUT bit value of Socket n Interrupt Register(Sn_IR) is ‘1’ . (In this case, if interrupt of
Socket n is activated, interrupt occurs Refer to Interrupt Register (IR), Interrupt Mask Register
(IMR), and Socket n Interrupt Register.)
Socket Close
This process should be processed in case that connection is closed after data exchage, socket should
be closed with Timeout occurrence, or forcible disconnection is necessary due to abonormal operation.
1. Give CLOSE commands to Socket n Command Register(Sn_CR).
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