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Is the interface cable connected?
Yes
Is the interface cable OK?
Yes
Is the RS-423 interface used?
Yes
Is the selected protocol OK?
Yes
Is the selected baud rate OK?
Yes
Is the selected data length OK?
Yes
Is the selected data format OK?
Yes
See page 3-5, DC voltage check.
No
Connect the interface cable.
No
Replace the interface cable.
No (Centronics)
See page 3-5, DC voltage check.
No
Use the correct protocol.
No
Use the correct baud rate.
No
Use the correct data length.
No
Use the correct data format.