The syntax for the IXLCACHE REQUEST=READ_DATA is as follows:

main diagram

                                   .-,ASSIGN=YES-.   
>>-IXLCACHE--b--REQUEST=READ_DATA--+-------------+-------------->
                                   '-,ASSIGN=NO--'   

                  .-,OLDNAME=NO_OLDNAME-.                              
   .-,REGUSER=YES-+---------------------+-,VECTORINDEX=vectorindex-.   
   |              '-,OLDNAME=oldname----'                          |   
>--+---------------------------------------------------------------+-->
   |             .-,OLDNAME=NO_OLDNAME-----------------------.     |   
   '-,REGUSER=NO-+-------------------------------------------+-----'   
                 '-,OLDNAME=oldname-,VECTORINDEX=vectorindex-'         

   .-,RETURNDATA=YES-.                       
>--+-----------------+--,CONTOKEN=contoken---------------------->
   '-,RETURNDATA=NO--'                       

   .-,REQID=NO_REQID-.             .-,OLDNAME=NO_OLDNAME-.   
>--+-----------------+--,NAME=name-+---------------------+------>
   '-,REQID=reqid----'             '-,OLDNAME=oldname----'   

>--+--------------------------------------------------+--------->
   +-,BUFLIST=buflist-| parameters-1 |----------------+   
   '-,BUFFER=buffer-| parameters-2 |-,BUFSIZE=bufsize-'   

   .-,ADJAREA=NO_ADJAREA-.                       
>--+---------------------+--,STGCLASS=stgclass------------------>
   '-,ADJAREA=adjarea----'                       

>--,VECTORINDEX=vectorindex------------------------------------->

   .-,MODE=SYNCSUSPEND-----------------------.   
>--+-----------------------------------------+------------------>
   +-,MODE=SYNCECB-,REQECB=reqecb------------+   
   |                .-,REQDATA=NO_REQDATA-.  |   
   +-,MODE=SYNCEXIT-+---------------------+--+   
   |                '-,REQDATA=reqdata----'  |   
   +-,MODE=SYNCTOKEN-,REQTOKEN=reqtoken------+   
   +-,MODE=ASYNCECB-,REQECB=reqecb-----------+   
   |                 .-,REQDATA=NO_REQDATA-. |   
   +-,MODE=ASYNCEXIT-+---------------------+-+   
   |                 '-,REQDATA=reqdata----' |   
   '-,MODE=ASYNCTOKEN-,REQTOKEN=reqtoken-----'   

   .-,ANSAREA=NO_ANSAREA-------------.                         
>--+---------------------------------+--+------------------+---->
   '-,ANSAREA=ansarea-,ANSLEN=anslen-'  '-,RETCODE=retcode-'   

>--+------------------+--| main-2 |----------------------------><
   '-,RSNCODE=rsncode-'               

main-2

   .-,PLISTVER=IMPLIED_VERSION-.   
>>-+---------------------------+-------------------------------->
   +-,PLISTVER=MAX-------------+   
   '-,PLISTVER=plistver--------'   

   .-,MF=S--------------------------.   
>--+--------------------------------+--------------------------><
   |                .-,0D-----.     |   
   +-,MF=(L-,mfctrl-+---------+-)---+   
   |                '-,mfattr-'     |   
   |                .-,COMPLETE-.   |   
   '-,MF=(E-,mfctrl-+-----------+-)-'   
                    '-,COMPLETE-'       

parameters-1

   .-,BUFADDRTYPE=VIRTUAL,PAGEABLE=YES,BUFSTGKEY=CALLERS_KEY,BUFALET=NO_BUFALET--------.   
>>-+-----------------------------------------------------------------------------------+-->
   |                                       .-,BUFALET=NO_BUFALET-. .-,BUFADDRSIZE=31-. |   
   +-,BUFADDRTYPE=VIRTUAL-| parameters-2 |-+---------------------+-+-----------------+-+   
   |                                       '-,BUFALET=bufalet----' '-,BUFADDRSIZE=64-' |   
   |                   .-,BUFADDRSIZE=31-.                                             |   
   '-,BUFADDRTYPE=REAL-+-----------------+---------------------------------------------'   
                       '-,BUFADDRSIZE=64-'                                                 

>--,BUFNUM=bufnum--,BUFINCRNUM=bufincrnum----------------------><

parameters-2

   .-,PAGEABLE=YES,BUFSTGKEY=CALLERS_KEY------.   
>>-+------------------------------------------+----------------><
   |               .-,BUFSTGKEY=CALLERS_KEY-. |   
   +-,PAGEABLE=YES-+------------------------+-+   
   |               '-,BUFSTGKEY=bufstgkey---' |   
   '-,PAGEABLE=NO-----------------------------'