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Communications with PC by Direct Connection
Section 1-5
1-5 Communications with PC by Direct Connection
1-5-1 Functions of the Allocated Bits and Words
When using an NT20S-ST121-EV3 with the direct connection function (host link or
NT link), NT20S-ST122-V1 (C200H direct communication), the elements dis-
played on the NT20S and the NT20S status can be allocated to the bits and words
of the PC. By changing the contents of the bits and words, the NT20S can be con-
trolled by the PC. It is also possible to send data to the PC by pressing the touch
switches on the NT20S.
S Controlling the NT20S by a PC
The following NT20S functions can be controlled by a PC.
Screens : Display of designated screens, confirmation of
screen numbers, etc.
Memory tables : Writing to a memory table, copying from a
memory table to another memory table, etc.
Lamps and touch switches : Display instructions, confirmation of display
status, etc.
System control : Buzzer ON/OFF, backlight ON/OFF, and other
NT20S status
S Notifying from the NT20S to a PC
Data in the NT20S is sent to a PC when a touch switch is pressed. The following
types of data are sent to a PC.
- NT20S status
- Touch switch status
- Numerical values input with touch switches by using the numeral setting func-
tion
- Changes in a memory table after copying between memory tables
Functions of Display Elements
S Lamps
Allocation destination: Bit
Lamp #1 (Bit 000100)
Lamp #2 (Bit 000101)
Switch 1: ON (Bit 000100)
Switch 2: OFF (Bit 000101)
NT20S PC
Lit
Unlit
PC’s bit status is displayed by the “Lamp” on the NT20S.
The lamp comes on (flashes) when the PC’s bit status (lamp bit) is ON (1), and
goes off when it is OFF (0).
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