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Status-Control(...) Acknowledge

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

Syntax

struct Status-Control(...) Acknowledge {  
    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;  
};   
struct Status-Control(...) Acknowledge {  
    PTRBFELT   hdreptr->elteptr;  
    INTEGER    hdreptr->startd;  
    INTEGER    hdreptr->endd;  
    CHAR       hdreptr->trpad;  
    CHAR[268]  hdreptr->dataru;  
};

Members

nxtqptr
Pointer to next buffer header.

hdreptr
Pointer to buffer element (NIL if not using LUA).

numelts
Number of buffer elements (0x00 if not using LUA).

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 ACKPOS (0x02).

sfhdr.stctlhdr.ctltype
Control type.

sfhdr.stctlhdr.ctlack
Reserved.

sfhdr.stctlhdr.ctlflag1
Application flag 1.

sfhdr.stctlhdr.ctlflag2
Application flag 2. (For more information, see STSN.)

sfhdr.stctlhdr.ctlnumb1
Code 1.

sfhdr.stctlhdr.ctlnumb2
Code 2.

sfhdr.stctlhdr.ctlmsgk
Message key.

LUA only (see Remarks):
Element

hdreptr–>elteptr
Pointer to buffer element (NIL).

hdreptr–>startd
Start of data in this buffer element.

13 or 10 for second and subsequent segments of outbound segmented request/response units (RUs)

hdreptr–>endd
End of data in this buffer element.

hdreptr–>trpad
Reserved.

hdreptr–>dataru
Data RU.

Remarks

  • If the application is using the LUA variant of the function management interface (FMI), the transmission header (TH), response header (RH), and RU are included in the data element, and the startd field points to the TH. The ctlflag1 and ctlflag2 bytes are not defined and should not be used. The appropriate values from the data should be used instead. (For more information about FMI, see FMI Concepts.)

  • If the application is not using the LUA variant of the FMI, the message consists of a buffer header only. There is no buffer element.

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

  • The code 1 and code 2 fields apply only for Status-Control(STSN) Acknowledge messages, where they are the application's secondary-to-primary and primary-to-secondary sequence numbers respectively.

  • For messages from the application to the local node, the message key field must match the message key in the corresponding Status-Control Request.