Omron Programmable Terminals NT31 NT31C - Manual (Page 227)

6-11 Section System Maintenance
217
After confirming the result of the test, press Quit. The NT31/NT31C returns to the
I/F CHECK MENU screen.
Check communication at the serial ports (A, B).
Check Screen
The check screen and check method differ according to the communication
method set for the port to be checked.
For Host Link
Example: Serial port A while using the host link
Press Execute to start the check. The data for checking communication is sent to
the host, and is displayed as the Sending Data in hexadecimal.
• If communication with the host is normal, the reply from the host is displayed at
Received Data in hexadecimal.
• If a communication error occurs while checking the communication conditions
with the host, a communication error screen is displayed. Since this indicates
that there is a communication fault, check the communication cables and set-
tings.
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 conditions
with the host, a communication error screen is displayed. Since this indicates
that there is a communication fault, check the communication cables and set-
tings.
Checking
Communication at Serial
Ports