American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 100)

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Remote Interface Reference
Error Messages
•
-403, "Serial parity error"
The number of data bits and/or the parity of the Model 286 and the host
device are not identical.
•
-404, "Serial data overrun"
The received buffer of the Model 286 was overrun. Decrease the baud rate.