Ceilometer CT25K
CT25K-U059en-2.1 User’s Guide
117
8.8.2 Replacing boards
1. Plug the new board carefully into the corresponding slot (Figure 8-7).
2. Attach the new board with the two screws. Then plug in connectors.
Cable connections were described in paragraph 2.5.
3. When the Ceilometer Interface Board is replaced, the parameters need to
be restored, refer to the following Paragraph 8.8.2.1 The other boards of
the board frame DMF51 do not need parameter settings. If the DMC50
Processor board has been replaced, the software version of the new board
can be checked with the command: GET VERSION ↵
8.8.2.1 Parameter settings of Ceilometer Interface board DCT51
The Ceilometer Interface Board contains all the measurement related
parameters in its EEPROMmemory. When this board is replaced, the
parameters need to be restored. Do as follows:
a) The default baud rate for the maintenance line is 2400 Bd, 7 data bits, 1
Stop bit, Even parity. If some other baud rate was previously used with
the removed DCT51, you may have to adjust your maintenance terminal
to the default setting to be able to communicate with the ceilometer.
b) Do the parameter settings for the Laser Transmitter CTT21 as described
in Paragraph 8.4.2. Replacement, Step 4. The internal Cross talk
Compensation does not need adjusting in this case. Instead, give the
command: SET ALGORITHM DEFAULTS ↵
c) Do the parameter settings for the Receiver CTR21 as described in
Paragraph 8.5.2 Replacement, Step 7. The internal Cross talk
Compensation does not need adjusting. Instead, give the command: SET
DATA_ACQ AUTOADJ ON ↵
d) Restore the maintenance and data line communication speed, message
type, interval, units etc. as required, if defaults are not to be used.
8.9 Line & Power Subassembly CTP241
8.9.1 Removal
When there is reason to suspect malfunction in the Line & Power
Subassembly (CTP241), do as follows:
WARNING
The Line & Subassembly contains dangerous voltage of
115 VAC/230 VAC. Turn the power off according to
Paragraph 8.3 Start-up procedure before you continue.
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