Intermec CV30 TE 2000 Terminal Emulation Programmer's Guide - Page 33

Chapter 2 - Using Terminal Emulation Applications AID-Generating Keys AID-generating keys generate AID codes that go in the display data stream to the host system. They alert the host system that the Intermec Application Server or controller requires some action. TE 2000 emulates all of the AID-generating keys on a 5291 Display Station. AID-Generating Keys Key Clear Enter/Rec Adv F1-F24 Help (nonerror state) Print Record Backspace (Home) Roll Up and Roll Down Description The system environment determines the results of this key. If the computer is in session, [CLEAR] issues the AID code hex BD, which requests the host system issue a Clear Unit command to the computer to clear the display. If not in session, [CLEAR] clears the entire display regeneration buffer. Enters information. User-defined command functions. Refer to your application's user manual for detail on the functions. Issues a hex F3 AID byte to the host system. Tells the controller that the operator wants to print the contents of the present display. Issues hex F6 to the host system. When pressed with the cursor in the home position, a record backspace is requested. The AID code hex F8 and cursor address are sent to the host system. Roll display up or down one page. Roll Up issues AID code hex F5. Roll Down issues AID code hex F4. Roll Keys Do not confuse Roll Up and Roll Down with the Roll command. Roll Up and Roll Down are AID keys the computer sends to the host to request and display additional screens. The host transmits a new screen in response to this command. The new screens allow you to view data either above or below what appears on the current screen. 5250 computers support the Roll command (hex 23) received from a host application. Using this command, a host application can roll an area of the screen up or down. The direction of the roll and number of lines to roll are specified in the command. • A Roll command moves the screen, but not the window/viewport. The screen scrolls through the window/viewport when you roll up or down, but the window/viewport remains stationary. The Roll keys cause the host to send down additional screens when you are at a Roll screen. A Roll screen typically has text in the lower right-hand corner of the screen to indicate there are additional screens to view. • Paging keys (window/viewport page up, window/viewport page down, window/viewport page right, window/viewport page left) move the viewport within one screen. They do not move the screen itself. 12 TE 2000TM Terminal Emulation Programmer's Guide