Omron NT20S Operation Manual page 121

System Maintenance
Checking the Communications with the Host (NT20S-ST128)
102
Execute a NT20S-to-Host communication check by the menu operation from the
System Menu as mentioned below.
[ SYSTEM MENU ]
Quit
Transmit Mode
Maintenance Mode
[ MAINTENANCE MENU ]
Quit
PT Setting
I/O Check
Init. Memory
Memory Switch
[ I/O CHECK MENU ]
Quit
LED Check
Buzzer
Touch Switch
Data Memory
[ COMM. CHECK MENU ]
Quit
Tool I/F
RS-232C I/F
DIP-SW Status
LCD Display
Comm. Check
Section 3-9
Select "Maintenance Mode".
Select "I/O Check".
Select "Comm. Check".
Select "RS-232C I/F".