Intermec CV30 Intermec Terminal Emulator (ITE) Programmer's Reference Manual - Page 40

Chapter 1 - About 3270 and 5250 Programming • Invalid IC order. • More than 80 bytes of data are specified. Description: Restrictions: Format: Write to Display (WTD) The WTD command does the following: • Modifies the format table and display buffer contents. • Governs MDT flags and Message Waiting annunciator. • Nulls nonbypass fields. • Controls keyboard lock and cursor blink. This command is rejected if the display is in a prehelp error, posthelp error, system request, or SS message state. If the display supports a separate message line, and the message line is selected, then only system request or SS message state result in a contention state error. However, if the error line is in use and the WTD attempts to redefine the error line (using Start of Header byte 4), a negative response is generated. The Write to Display command is formatted as follows: ESC Hex 04 Hex 04 Write to Displayl Hex 11 Hex 11 CC Byte 1 Hex 00 Hex 00 CC Byte 2 Hex 13 Hex 13 Orders or Data Results: CC Byte 1 and CC Byte 2 are the write control characters. CC Byte 1 may: • Clear the master MDT flag and reset the MDT flags. • Null all appropriate nonbypass fields. CC Byte 2 sets: • Cursor blink • Keyboard lock • Alarm • Message Waiting annunciator Any character that is not an order and not associated with an order is considered data, and is written on the screen at the current display address. The address is then incremented by 1 for each character written. These characters should be hex 00, hex 1C, or greater than hex 1F so there is no conflict with the codes reserved for orders. If the WTD command changes the format table, the keyboard remains locked until specifically unlocked by CC Byte 1 or a subsequent WTD command. 28 Intermec Terminal Emulator (ITE) Programmer's Reference Manual