Campbell Met One 034A-L Instrukcja Operatora Pobierz pdf (Strona 22)

Installation, Operation and Maintainance of Automatic Meteorological Stations

CR10X Storage and Control Module

“*8” (to activate Manual Data Dump using the star-eight mode)

Since METSTAT only uses Final Storage Area 1, star-eight mode automatically continues with the selection of the

output device. The display will show “01”. Type the following command:

“71” (this is the code for the SM4M storage module)

“A” (keyboard equivalent for ENTER)

The display shows a number. This is the Storage Module Pointer (SPTR), which represents the location up to which

data have been downloaded in previous dump sessions. As a default, this is the starting point for the next data trans-

fer exercise. However, in this case the user must manually change the SPTR. To transfer the complete Final Storage

to the storage module, type in:

“A” (keyboard equivalent for ENTER)

The display shows a number; which is the address of the last occupied slot in the Final Storage Location, contain-

ing the most recent measurement value. As above, it concerns a pointer and is called the Data Storage Pointer (DSP).

Write down this number. Type in:

“B” (to go back to the previous step in the “star-eight” mode)

As before, the display shows a number, now representing the SPTR. To change the location from where data

transfer will start, type in the DSP added with one. In this way the full Final Storage will be transferred to the SM4M.

Continue by typing in:

“A” (keyboard equivalent for ENTER)

The display shows “04”. To start data transfer, type:

“1” (in fact, any number would do)

“A” (keyboard equivalent to ENTER)

The actual search for the lost information should be done using the SPLIT module of the PC208W Data Logger

Software. The user is referred to the separate SPLIT manual, included in Campbell Scientific’ Instruction Manual for

the PC208W Datalogger Support Software.

Problem 3: Although data transfer from logger to SM4M has been concluded successfully, the downloaded data

does not cover the whole period between present and previous data dump. Instead, the available data only seems to

come from the most recent period.

Cause: The SM4M automatically retrieves all data between Storage Module Pointer (SPTR) and Data Stor-

age Pointer (DSP). In this particular case, the period between the two last data retrieval events has generated more

data than the capacity of the logger’s RAM. Consequently, given the logger’s ring mode, new data have been written

over not yet retrieved locations. The location of the SPTR has remained unchanged while the DSP, because of the

circular configuration, has come back to its original position at a certain stage, and once again moved in front of the

SPTR.

Remedy 3: Increase the frequency of inspection and data retrieval visits to the station. Part of the lost informa-

tion can be recovered by manually down loading data using the “star-eight” mode. To this end follow the instructions

given under “Remedy 2”.

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Campbell Met One 034A-L Instrukcja Operatora Strona 22