In all of these conditions, the dead key sequence is aborted, and an accent only is displayed at.the cursor position. The operator must reset and rekey both the accent and the valid character.
The Security Keylock is a security-enhancement special feature that provides a key-controlled lock for the displays. When the key is in the "off" position or is removed from the display station, the message buffer is "locked" , which prevents entry, modification, and display of data. The display station is unavailable to pro-grammed read or write operations and operator inputs such as keyboard entry.
Programmed attempts to access display stations that have the key turned off or removed from the lock result in responses being returned to the CPU by sending UC plus IR Status and Sense for all read or write commands.
In addition to processing print commands, the DIP Adapter provides a local copy function which allows direct data transfer from a display station to a printer attached to the same adapter. The local copy function is directed by a print-control matrix. The print-control matrix is called the Default Matrix.
The print keyO-Oon a keyboard attached to a display station may be used by the operator to initiate a local copy request. The local copy request is serviced by a printer selected under control of the print control matrix.
At the time the DIP Adapter issues a Reset to each attached terminal and the terminal responds positively, it is posted in the Default Matrix. The matrix identi-fies each terminal in ascending order, by port. For example:
Port Terminal Assignment
o
D X
1 2
D P
02 X
3 4 5 6
P D D P
X 06 06 X
Note:
x
= not applicable7 P X
Displays (D) are assigned the first printer (P) occurring at a higher port number.
In this example, display terminal will be assigned at port 1, the printer on port 2.
Display terminals on ports 4 and 5 are assigned the printer on port 6.
If power is off at a terminal when the Reset is issued, nothing is posted in the matrix for that terminal. The DIP adapter assumes that the device at that port is a display. Power off at ports 1,4, or 5 does not alter the definition of the matrix in this example. Power off at ports 2 and 3 (printer) results in display terminal at port 1 being assigned to the printer at port 6.
If a terminal is powered off after it has been posted in the matrix, the terminal is considered "not ready" . The matrix is not altered. Thus, if the printer at port 2 is powered off after being posted in the print matrix, a not-ready condition would
Chapter 3. Displays 3-13
Printer Selection
Operator-Initiated Copy
be signalled if a local copy operation is attempted by the display at port 1. How-ever, by forcing a DIP Adapter reset (for instance IPL), printer 2 is removed from the Default Matrix, which then appears:
Port
If a terminal is initially powered off, and then powers on some time after the Reset, the DIP Adapter is notified, and the matrix is updated. For example, if the printer attached to port 6 was not powered on, the Default Matrix appears as:
Port
Applying power to a printer at port 6 at a later time will change the assignments for displays 4 and 5 to printer 6, as in the previous examples.
As configured in the first example, the printers attached to ports 3 and 7 will not be used for local copy from display stations. They are available for uninterrupted use by the host for direct print command operations. The printers on ports 2 and 6 may also be used by the host for direct print command operations. In this case, copy operations may have to wait by execution of print requests. On the other hand, print command will get "Busy" if the printer is engaged in a local copy operation.
The IDENT key on the keyboard of the display station, may be used to change the printer assigned by the Default Matrix as described under "IDENT Key". For example, by using the IDENT key and keying 03 at the display attached to port 1, the Default Matrix becomes:
By forcing a D
/P
Adapter reset, the original Default Matrix is restored.The operator may initiate a local copy operation by pressing the PRINT key on the display keyboard. The DIP Adapter will then attempt to execute the local copy function on the printer with port number shown in the "Printer Assignment"
indicator in the display indicator row. If the printer is free, the "Printing" symbol
is displayed and the keyboard is unlocked. All data is transferred from the display buffer to the printer buffer and subsequently printed. Upon completion, the
"Printer Assignment" indicator will be displayed.
If the printer is busy (local copy operations for other displays or print commands), the "Input Inhibited Printer Busy" symbol is displayed. The request is queued and the keyboard is locked until the printer ends its operation and handles the pending copy request(s). Then the above sequence is initiated. The operator, however, can cancel the local copy request by pressing the DEV CNCL key. This turns off the Input Inhibited indicator, unlocks the keyboard, and dequeues the print request. The operator is then free to perform another task.
If the printer is not functional because of an "intervention required" or
"permanent error" condition, then the "Input Inhibited Printer Not Working"
symbol is displayed and the keyboard is locked. The print request is queued. The operator may wait until the printer becomes ready or depress the DEV CNCL key to continue. This action turns off the Inhibited indicator and unlocks the key-board. The operator may then choose an alternate action like selecting another printer. If the operator attempts to print and the selected printer is used as a 1052 copy device, the "Input Inhibited Printer Not Working" symbol appears. The print request is not queued. DEV CNCL and selecting another printer are appro-priate operator actions.
Chapter 3. Displays 3-15