Omron NT31 Operation Manuals page 249

System Maintenance
238
- For NT link (1:1 or 1:N)
Example: Serial port B while using the NT link (1:N)
Press "Execute" to start the check. The data for checking communication is
sent to the host, and is displayed as "∗∗" symbols at "Sending Data".
- If communication with the host is normal, the reply from the host is displayed
at "Received Data" as "∗∗" symbols.
- If a communication error occurs while checking the communication condi-
tions with the host, a communication error screen is displayed. Since this
indicates that there is a communication fault, check the communication
cables and settings.
- For Memory link
Example: Serial port A while using the memory link
The check is started as soon as the check screen is displayed. Send the com-
mand from the host.
- If communication with the host is normal, the data received from the host is
displayed in hexadecimal text code at "Received Data".
- If nothing is displayed at "Received Data" when the command is sent from
the host, there is a communication fault: check the communication cables
and settings.
Section 6-11