Status-Acknowledge(Nack-2)

The Status-Acknowledge(Nack-2) message flows from the node to the application. It is used with both SSCP and PLU connections.

struct Status-Acknowledge(Nack-2) {
    PTRBFHDR  nxtqptr;
    PTRBFELT  hdreptr;
    CHAR      numelts;
    CHAR      msgtype;
    CHAR      srcl;
    CHAR      srcp;
    INTEGER   srci;
    CHAR      destl;
    CHAR      destp;
    INTEGER   desti;
    CHAR      sfhdr.stackhdr.akstat;
    CHAR      sfhdr.stackhdr.akqual;
    INTEGER   sfhdr.stackhdr.akmsgkey;
    CHAR      sfhdr.stackhdr.akflags1;
    CHAR sfhdr.stackhdr.akflags2;
    INTEGER sfhdr.stackhdr.aknumb1;
    INTEGER sfhdr.stackhdr.aknumb2;
}; 
 

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.stackhdr.akstat

Status type ACK (0x01).

sfhdr.stackhdr.akqual

Acknowledgment type ACKNEG2 (0x04).

sfhdr.stackhdr.akmsgkey

Message key.

sfhdr.stackhdr.akflags1

Reserved.

sfhdr.stackhdr.akflags2

Critical failure indicator

Noncritical failure (0x00)
Critical failure (0x01)

sfhdr.stackhdr.aknumb1

Error code 1.

sfhdr.stackhdr.aknumb2

Error code 2.

Remarks

• The Status-Acknowledge(Nack-2) message consists of a buffer header only; there is no buffer element.
• The message key refers to the message key in the inbound data message to which this is a negative acknowledgment.
• See Error and Sense Codes for error codes.