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Status-Control(...) Negative-Acknowledge-2

  • Article

The Status-Control(...) Negative-Acknowledge-2 message flows from the node to the application. It is used with a primary logical unit (PLU) connection.

Syntax

  
struct Status-Control(...) Negative-Acknowledge-2 {  
    PTRBFHDR  nxtqptr;  
    PTRBFELT  hdreptr;  
    CHAR      numelts;  
    CHAR      msgtype;  
    CHAR      srcl;  
    CHAR      srcp;  
    INTEGER   srci;  
    CHAR      destl;  
    CHAR      destp;  
    INTEGER   desti;  
    CHAR      sfhdr.stctlhdr.ctlstat;  
    CHAR      sfhdr.stctlhdr.ctlqual;  
    CHAR      sfhdr.stctlhdr.ctltype  
    CHAR      sfhdr.stctlhdr.ctlack;  
    CHAR      sfhdr.stctlhdr.ctlflag1;  
    CHAR      sfhdr.stctlhdr.ctlflag2;  
    INTEGER   sfhdr.stctlhdr.ctlnumb1;  
    INTEGER    sfhdr.stctlhdr.ctlnumb2;  
    INTEGER   sfhdr.stctlhdr.ctlmsgk;  
};

Members

nxtqptr
Pointer to next buffer header.

hdreptr
Pointer to buffer element (NIL).

numelts
Number of buffer elements (0x00).

msgtype
Message type STATFMI (0x21).

srcl
Source locality.

srcp
Source partner.

srci
Source index.

destl
Destination locality.

destp
Destination partner.

desti
Destination index.

sfhdr.stctlhdr.ctlstat
Status type STCNTRL (0x02).

sfhdr.stctlhdr.ctlqual
Control qualifier ACKNEG2 (0x04).

sfhdr.stctlhdr.ctltype
Control type.

sfhdr.stctlhdr.ctlack
Reserved.

sfhdr.stctlhdr.ctlflag1
Reserved.

sfhdr.stctlhdr.ctlflag2
Reserved.

sfhdr.stctlhdr.ctlnumb1
Error code 1.

sfhdr.stctlhdr.ctlnumb2
Error code 2.

sfhdr.stctlhdr.ctlmsgk
Message key.

Remarks

  • The Status-Control() Negative-Acknowledge-2 message consists of a buffer header only. There is no buffer element.

  • The message key field matches the message key in the corresponding Status-Control request.

  • For a summary of Status-Control control type codes, see the table in Status-Control Message.

  • For a list of error codes, see Error and Sense Codes.