Omron FZ4 Series User Manual page 581

Data cannot be saved
Are the communication specifications of the external devices compatible with the controller?
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Is "Flow control" in communication specifications set to "None"?
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To save data, set "Flow control" to "None".
Reference: Setting Communication Specifications (RS-232C/422-PLC Link) (p.368)
Reference: Setting Communication Specifications (RS-232C/422 - Non-procedure) (p.439)
FZ4 User's Manual
8
FAQ 579