Omron NT20S Operation Manual page 67

Connection to a PC by the NT Link (1:1)
48
S CVM1/CV-series (-EVj)
When connecting to a CVM1/CV-series (-EVj) CPU, set the switches as given
below.
When using CVM1/CV series, always set CPU execution processing (execution
control 2) in the PC system settings to simultaneous processing.
S I/O port selection (selector switch)
Set this to "RS-232C".
S NT link setting (DIP SW3)
Set SW3 to "ON".
OFF ↔ ON
Section 2-5