22
Communication with the Host
Section 1-3
Functions of the PT Status Notify Area (NT31/NT31C to PC)
The “PT status notify area” is used to notify the changes in the NT31/NT31C sta-
tus.
When the NT31/NT31C status changes, the change is written to this area in the
PC. By reading the data from this area, the NT31/NT31C status can be checked.
[Example of PT status notify area application]
When the NT31/NT31C status changes, the change is notified to the PT status
notify area as shown below (page 275).
PC
12345678
12345678
5678
1234
12345678
8800
0013
NT31/NT31C
Numeral memory table 13
PT status notify area
Content upgrade memory table
PT status
Allocated word (numeral table 13)
Start
Start + 1
789
456
123
0.
Functions of the Window Control Area (PC to and from PT)
The ”window controlarea” is usedto notify and control the window status. The win-
dow control area has areas that correspond to three windows. Each area stores
the screen number, and the X and Y coordinates of the lower left corner of the win-
dow that is being displayed.
When data is written to this area in the PC, the NT31/NT31C reads the contents
and executes tasks such as switching the windows to be displayed or moving the
position of the windows according to the contents (page 7 to 170).
When the window display status changes, the change is written to this area in the
PC. By reading the data from this area, the window display status can be checked
(refer to page 7 to 170).
If the window functions are not used, it is not necessary to allocate a window con-
trol area to the host.
[Example of window control area application]
When data is written to the window control area, the NT31/NT31C operates as
shown below.
Window
(screen No.34)
Opens
X coordinate
Y coordinate
Screen number
PCNT31/NT31C
0020
0034
0139
WIndow control area
(local window 2)
Bottom left
coordinate (20, 139)
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