Vaisala LT31 - Page 274

User's Guide ______________________________________________________________________
274 _________________________________________________________________ M210667EN-C
Problem Probable Cause Remedy
If you are using RS-232 or RS-485 data lines
verify that the TXD LED on the LTC212
board blinks when you send characters to
the line.
Line is broken or a wire is loose
Check the cable connections.
Data messages
arrive but the
measurement values
are wrong and do
not change or
patterns of data sets
are given.
Test message simulation has
not been turned off
Give the command SIMULATE
TEST_MESSAGE OFF.
Reset LED inside
the LTI211 does not
light up when power
is turned on
An AC fuse or the DC output
line fuse on FSP102 is blown
Check and replace the blown fuse on the
FSP102 board.
Status LED inside
LTI211 is giving a
fast flash instead of
a long flash of 1 Hz
LTC212 indicates an indication. Check the content of the indication from the
status message and follow the instructions
above.
Status LED inside
the LTI211 is giving
two fast flashes
instead of blinking at
1 Hz constant rate.
LTC212 indicates a warning. Check the content of the warning from the
status message and follow the instructions
above.
Status LED inside
LTI211 is giving
three fast flashes
instead of blinking at
a constant rate of
1 Hz.
LTC212 indicates an alarm. Check the content of the alarm from the
status message and follow the instructions
above.
Status LED inside
LTI211 is giving four
fast flashes instead
of blinking at a
constant rate of
1 Hz.
LTC212 indicates an error. Check the content of the error from the
status message and follow the instructions
above.