7526 DCT Reference

Parameter File Download Sequence

parameter file download sequence

Once the parameter files have been initialized, they are ready for downloading. The required download sequence is as follows: 

          TERMINAL
         CONTROLLER                DCT
         __________                ___


         CMD 9C   ------>                    Load File 0
                         <------   ACK
         CMD 1    ------>                    Status request
                         <------   RSP       Return status
         ACK      ------>


         CMD 9C   ------>                    Load File 1
                         <------   ACK
         CMD 1    ------>                    Status request
                         <------   RSP       Return status
         ACK      ------>


    Continue loading Files 2-8, a

         CMD 9C   ------>                    Load File 2
                         <------   ACK
         CMD 1    ------>                    Status request
                         <------   RSP       Return status
         ACK      ------>


    Load CFR File c


         CMD MB   ------>                    Allocate space for CFR
                         <------   RSP       Return starting address
         CMD MC   ------>                    Load CFR
                         <------   ACK
         CMD MD   ------>                    Start CFR
                         <------   ACK


    Setup buffer File 9 or interactive buffer


         CMD 8    ------>                    Specify polled buffer
                         <------   ACK
         CMD 1    ------>                    Status request
                         <------   RSP       Return status
         ACK      ------>


    Set DCT Clock


         CMD 4    ------>                    Set clock
                         <------   ACK
         CMD 1    ------>                    Status request
                         <------   RSP       Return status
         ACK      ------>
 


    Set DCT in service


         CMD A1   ------>                    Set DCT in service
                         <------   ACK
         CMD 1    ------>                    Status request
                         <------   RSP       Return status
         ACK      ------>

Chapter 8. RAM Files

The 7526 DCT stores general configuration data, transaction program instructions, and data validation files in RAM resident files. This chapter specifies the rules for initializing and processing the RAM files, and describes the file record contents, parameters, key commands, valid byte values and file structures.