Loading the PS buffer

If the operator knows the PS buffers need to be loaded (because the device was just powered on), enter a response-mode transaction that loads programmed symbols by using an installation-written application program that loads PS buffers.

The load PS data stream should be the first part of the message sent by the application program and a notification, such as THE PROGRAMMED SYMBOLS LOAD FOR psname COMPLETE should be the remainder. The notification informs the terminal operator when the programmed symbols have been loaded. This transaction requires the Message Format Service (MFS) bypass option.

When the output device for which the PS buffers are to be loaded includes a printer or a different display, another technique must be used.

Example: These events illustrate one example of using an automated operator application program:

Procedure

  1. The master terminal operator at Display_A enters a transaction (response or conversational) requesting that programmed symbols be loaded for Display_A, Printer_B, and Display_C.
  2. In processing the transaction, an AOI program assigns LTERMs for Printer_B and Display_C, temporarily, to a special PTERM reserved for loading the PS buffers. The AOI program assigns dummy LTERMs to Printer_B and Display_C.
  3. The AOI program inserts the message containing the load programmed symbols messages to the dummy LTERMs of Printer_B and Display_C.
  4. The AOI program sends a programmed symbols message to Display_A.
  5. The master terminal operator visually verifies messages on both displays and the printer and confirms to the transaction that the load was successful.
  6. The transaction reassigns the LTERMs back to their original status.