Omron E5CN User Manual page 290

Meaning
The communications line became unstable
when Controller power was turned ON or
interrupted, and the host device read the
unstable status as data.
The communications data was corrupted
from noise from the environment.
Note For details on errors, refer to E5CN/E5AN/E5EN Digital Temperature Controllers Communications Man-
ual Basic Type (Cat. No. H158).
Initialize the reception buffer in the host device before sending the first
command and after turning OFF the power to the Controller.
Try using a slower baud rate.
Separate the communications cable from the source of noise.
Use a shielded, twisted-pair cable for the communications cable.
Use as short a communications cable as possible, and do not lay or loop
extra cable.
To prevent inductive noise, do not run the communications cable parallel
to a power line.
If noise countermeasures are difficult to implement, use an Optical Inter-
face.
Countermeasures
Appendix
265