Omron NT20S Operation Manual page 36

Communications with PC by Direct Connection
Functions of the PT Status Control Area (PC to NT20S)
Functions of the PT Status Notify Area (NT20S to PC)
The "PT status control area" is used to control the NT20S status. When data is
written to this area in the PC, the NT20S reads the contents and operates accord-
ing to the contents.
[Example of the PT status control area application]
When data is written to the PT status control area, the NT20S will operate as given
below.
Screen 3
display
Continuous
buzzer sound
Numeral memory table 50
Numeral memory table 7
Copy
The "PT status notify area" is used to notify the changes of the NT20S status.
When a change is made in the NT20S status, the change is written to this area in
the PC. By reading the data from the area, the NT20S status can be checked.
[Example of the PT status notify area application]
When a change is made in the NT20S status, such change will be notified to the PT
status notify area as mentioned below.
12345678
NT20S
NT20S PC
Numeral memory table 13
PT status notify area
12345678
Allocated word (numeral table 13)
12345678
PC
PT status control area
Screen switch setting
Memory table
Copy setting
PT status control bits
Currently display screen
Content update memory table
PT status
Start
Start + 1
Section 1-5
17