Omron NT31 Operation Manuals page 33

Communication with the Host
Functions of the PT Status Notify Area (NT31/NT31C to PC)
Functions of the Window Control Area (PC to and from PT)
22
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).
NT31/NT31C
12345678
7 8 9
4 5 6
1 2 3
0 .
The "window control area" is used to 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.
NT31/NT31C
Window
(screen No.34)
Opens
Bottom left
coordinate (20, 139)
PC
Numeral memory table 13
1 2 3 4 5 6 7 8
PT status notify area
0013
8800
Allocated word (numeral table 13)
12345678 5 6
1 2
PC
WIndow control area
(local window 2)
0034
0020
0139
Section 1-3
Content upgrade memory table
PT status
Start
7 8
3 4 Start + 1
Screen number
X coordinate
Y coordinate