50
SECTION 5
Troubleshooting
F210
Setup Manual
SECTION 5
Troubleshooting and Maintenance
Serial Interface (RS-232C/RS-422) Errors
Problem Probable cause Reference
No communications are
possible.
•The cables are not correctly wired.
•The Controller’s communications specifications do not
match those of the external device.
•The communications mode was not selected under
[System settings/Communication/Serial].
Select [Normal], [Host link], or [Menu] in the
Communications (Serial) menu.
The status of communications can be checked with the
I/O monitor.
p.43
Operation
Manual
The Unit operates well
initially, but after a while
there is no response from
the Controller.
•The reception buffer on the external device (e.g.,
computer) is full.
Check that settings allow the data to be properly
received.
—
Cannot perform menu
operations from the
computer.
•The communications mode was not set to Menu in the
[System settings/Communication/Serial].
Operation
Manual
Data cannot be saved.
•The Controller’s communications specifications do not
match those of the external device.
•Is flow control turned OFF under
[System settings/Communication/Normal]?
Operation
Manual
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