Martel LC-110 Reference Manual page 45

LC110H Detected Errors
These errors are detected by the LC110H when receiving responses
from the loop device.
They are indicated by the text "LC110H error:" at the top of the
display. This is followed by one of the following error messages.
a) No response
The loop device did not respond to the last HART command sent.
Check the power and connections to the loop device. Try the
command again.
b) Character parity
The response received from the loop device contained one or more
characters with an invalid parity check. Try the command again. If
the error persists, check the power and connections to the loop
device.
c) Character frame
The response received from the loop device contained one or more
characters with an invalid frame format. Try the command again. If
the error persists, check the power and connections to the loop
device.
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