This document is 'Work In Progress' so content may not be complete.

Request for help from Wiki Readers

Do you understand how MX works?
Do you use hardware, or MX functionality, that is not yet documented? Can you begin that documenting?
Can you contribute simple text for novice users, examples of what you have done, correction of typing or factual errors, or supply missing details?
Will you make this page more useful by bringing content up-to-date as new releases change some information written for older releases?
Does any page need a section for novices, so they don't need to read more technical information further down that page?
Is there some information on this page, that should be on a separate page? Can you create the new page and move the less relevant information off this page, don't forget this page needs a link to the new page so people who expect to find it here know where it has moved to?

If you plan on contributing to the Wiki, then you will need an account.

Please use the Request Account form to apply for an account. Note that the Wiki is currently undergoing restructuring and is largely locked for editing, but please apply for an account if you wish to contribute in the future.
You will find help on how to contribute to this wiki at How to Edit.
If you need to consult others, please use the Cumulus Wiki suggestions forum.

Please be aware that information on this page may be incorrect.

This text was written for the (legacy) Cumulus 1 software. It has been updated to cover MX, but that was for a MX release that is no longer latest!

Mark Crossley has now written a utility (download at https://github.com/cumulusmx/CreateMissing) that can update dayfile.txt.

Safely editing the daily summary log

At the end of each meteorological day, Cumulus uses information held in today.ini to write a new line into dayfile.txt, before it resets today.ini ready for the new day. As discussed in Correcting_Extremes, it is possible for rogue values to be read from a weather station and propagate into various log files, so this article will help you make any necessary corrections.

The fields contained in the daily summary log are listed in the Dayfile.txt#List_of_Fields. That page contains a lot of information, and to avoid confusion information about editing this log has been moved here. Both Cumulus 1 and 3 (2 did not) now provide editors where you can see what is in your dayfile.txt log, and if you click on a particular line you can edit the fields in that line, or indeed delete that line. The functionality available to you, depends on the flavour of Cumulus you are running (and which release of that flavour you have installed).

The most common problems with dayfile.txt are:

(MX only) inconsistencies between lines i.e. one of following changes from one line to another
- either the date separator (character or characters between day of month, month, and year parts)
- or the decimal point or decimal comma (that separates the integer and decimal parts of real numbers)
people see Cumulus giving error messages saying there is an error in a particular line (Cumulus only reports first error, there may be more)
plots only show data for a subset of the lines in the file, because different lines have different formats for the dates
a Cumulus user (or an electrical fault) stops or starts the software close to rollover time, a Cumulus user upgrades the software close to rollover time, or another process interferes with Cumulus causing it to twice copy information from today.ini to dayfile.txt resulting in a duplicate line with same date (but incorrect content in one of the lines)

All errors generally relate to

Either using the same file, but moving between computers, without checking the locale settings
Or a mistake in the way a Cumulus user has edited the file, perhaps because of editing the file using Microsoft Excel (and formatting the date column as a date not as text)!

Validation by in-built editors

Both the legacy editor and the MX editor will ensure that the correct number of fields is stored (as defined at the release where you do editing) (one common error in an external editor is to accidentally add/delete a field).

The legacy editor does also validate individual fields for appropriate content (integer, real number, time-stamp).

Unfortunately, the editor provided with MX does not validate any fields. Thus you can use the wrong separator (between date elements, between hour and minute for time-stamps, between integer and decimal parts in any real number) in the MX editor and the incorrect line will be accepted.

Correcting date separator errors

The legacy software accepts any character (except space) as the separator between the day of month, the month, and the year, elements of the date. Therefore Cumulus 1 does not care if that separator is sometimes "/", sometimes "-", and/or sometimes ".".

MX is fussy, the same separator must be used in every date in the file. An error will be reported in diagnostics, and the historic graphs will stop working if the separator changes from one line to another.

So look at the last line in the file, that is the character MX expects
If any earlier line, or lines, uses a different character, then that line, or lines, must be edited, it is best to use an editor designed for programmers
- If the last line has hyphen "-", but some earlier lines use slash "/", it is simple to do an edit
  - Use "Replace All" option in your chosen editor, to find "/", and replace with "-". This works because "/" does not appear anywhere else in the file
- If the last line has "/", but some earlier lines have "." or "-" as separator, then the correction is more complex, because you don't want to edit any minus signs or decimal points in any other fields
  - See if your editor accepts "Regular Expressions", then you can look for two matching separators in same field, see this forum post.

See this forum thread for a fuller discussion.

Historic note: In Cumulus 1 builds, any symbol (including ;, :, /, &, -, and .) character (excluding what is defined as list separator) within the first field of each line was treated as part of separator characters when parsing for date. For builds 3000 to build 3049, MX used fixed offsets to find day, month, year. From Build 3050 MX uses the separators defined by the OS to split the values (so allowing for multi-character separators), but it does mean it will be sensitive to the separator value changing.

Importing data not recorded by Cumulus

You might have been using your weather station with some other weather software before you installed Cumulus. If you can get weather data in the format of daily summaries (and the rollover times match), you can import that data into the Cumulus dayfile.txt file using a script or spreadsheet package. All you have to ensure is that you can arrange the output to be in lines with fields in sequence shown in Dayfile.txt#List_of_Fields. There is more guidance later on this page about the rules you must obey for this file.

If you have imported the data from the other weather software into the Standard_log_files format, then in the Cumulus 1 editor, Create missing can insert the new rows for those days previously missing in dayfile.txt, as explained below.

Using the Cumulus 1 editing feature

This section applies to Cumulus 1.x.y only. The last command in Edit menu is dayfile.txt.

This is how you view the dayfile.txt from within Cumulus. Click the Help button for detailed instructions. Cumulus Help is concise but comprehensive.

It is a text editor, and it works best when at full screen:

correct individual values by over-typing new values over those currently displayed,
you can use insert key to add one or more missing rows (complete days) manually typing in values for all fields,
use delete key to remove an entire day (e.g. if you get a 'duplicate' error message) after ensuring all fields are correct in the line that will remain,
use Create missing button to insert missing rows (complete days) by reading from Standard_log_files and automatically calculating the best approximations for each field for those missing days.

Create Missing

If a date is missing from dayfile.txt, and not available in a back-up, then it is possible to create a missing line (with approximations for the derived extreme values) in Cumulus 1. That functionality is known as "Create Missing" and is found within the edit dayfile.txt screen.

Only use the editor when Cumulus is not doing catch-up or end-of-day, or any other action that could create an editing conflict.
With the contents of the file loaded into the editing table, click the Create Missing button
Cumulus 1 will now work through every line from start to end
If 2 adjacent lines are not for consecutive dates, Cumulus will attempt to create missing lines
It will read from the Standard log files all the data logged for each missing meteorological date (if 9am or 10am rollover is used, those read spans two calendar dates)
It will derive totals, averages, highs, and lows, from the data it reads, for each missing date
- Note that normally dayfile.txt lines are created from Today.ini which logs the daily totals, averages, highs, and lows, from every reading taken from the weather station
- Depending on your weather station, Cumulus is able to read values every minute, and consequently update today.ini each minute if an extreme happens,
- If Cumulus is set up to only log the readings every half an hour, create missing is only able to see 1/30th of the data,
- Due to this mismatch, the derived values (averages, highs, lows) this approach can store are much less accurate (hence why getting missing lines from a backup is better)

The Cumulus 1 editor provides a "Create Missing" option where it will, for any dates for which a line does not exist, create a line if it can from reading the detailed log file to extract all values relevant to that day and do the necessary minimum/maximum/total/average calculation for each dayfile.txt field, storing the time from the relevant other log file in any time-stamp field in dayfile.txt.

If a particular day does not exist as a row on the daily summary log, then 'create missing' can search the observations in the relevant monthly log, and calculate approximate highs, lows and totals to insert as an extra row in the daily summary log. These are approximate because the actual highs and lows for that day are quite likely to have occurred at moments in-between those that were logged.

For Create missing a list of inserted records is produced in dayfileeditlog.txt.

If just some fields are wrong in a particular row (meteorological day) on day file, then there is a work around as at all current versions (up to 1.9.4) you can only use 'Create missing' to read from the Standard_log_files if the whole day (a line starting with that date) is missing in dayfile.txt. Although Cumulus does not recognise the concept of a sensor not being available, it will write solar information even if you don't have a solar sensor; it does have to cope with reading a monthly log file that might have fewer derivatives than it wants (when using Create Missing) and therefore it may not know what to write into dayfile.txt as the calculated value. Cumulus 1 can't write a null value, so it writes zero for values, and "00:00" for time stamps. If you are using a 9am or 10am rollover time, be aware that create missing in Cumulus 1 always inserts 00:00 for null time-stamps, but in normal running Cumulus uses the rollover time for null time-stamps.

Dealing with errors identified by the software

If there is an error in dayfile.txt, then it is most likely to be found when you are viewing its data on one of the screens for editing the monthly, annual or all-time extremes. Cumulus 1 will illuminate its Error light if it finds an error in such cases and tell you the line/row number of the first found error, together with some details of the error it found. For example, if a row is blank, a row is duplicated, a field is corrupted, a field does not have an acceptable value, or a field is missing so subsequent fields are to the left of where they should be.

If you do have a 'duplicate' error, you need to decide which row to delete, and whether to copy any values from that row into the row you are keeping to ensure the correct extremes are retained.

Missing or Corrupted dayfile.txt lines

If you accidentally corrupt a line in the daily summary log, then both the original Cumulus software and MX's admin interface have editors for viewing and modifying content.

If you have one, or more, dates missing in your dayfile.txt file, then the next question is, has the line been deleted by accident?

If a line for a particular date was present before, but is now corrupted or missing:

See if you have a back-up of dayfile.txt with the line present and correct
- If it is a recent date, then Cumulus makes a backup of dayfile.txt every time it is restarted and after every end-of-day rollover
- If it is an older date, then maybe you took a back-up onto a separate drive or separate device
If you have a suitable backup available, take a copy of that file
Append onto the copy, any dates after when that copy ends, taking the extra lines from the current dayfile.txt
Rename the current dayfile.txt to say dayfile.old
Rename the copy you have edited to dayfile.txt and place into data sub-folder
Cumulus will now use the file with all days correct

One lesson here, is to try to remember (once a week), to check your dayfile.txt log file is okay, because Cumulus retains back-ups for only the last 7 days

Another lesson here, is to periodically take a backup, stored away from your Cumulus running environment in case you ever corrupt an old line

Correcting individual fields in existing dayfile.txt lines

The "Create Missing" functionality, described in earlier sub-section, is designed for when an entire line is missing for a prior date. Often people want to correct an individual field, in all lines within a particular period. This might be because you have suddenly discovered your daily pressure high and low are wrong by a certain offset, because you used the wrong setting for converting absolute pressure to the sea level equivalent you want to store in the file.

Neither Cumulus 1 nor MX provide any functionality to make such multi-line editing easy.

However, this can be resolved by opening dayfile.txt in a spreadsheet (carefully ensuring each column is treated as either text (date and time fields) or number (the value fields) and that your field separator is set in the filter conditions to be a column separator. Spreadsheets have a "Paste Special" function that allows you to add/subtract a constant to every cell in a column.

Correcting individual fields in multiple lines of Daily summary Log in Cumulus 1

In the Edit menu, select Dayfile.txt screen, for a text editor where you can overwrite entries, delete entire lines, and insert new lines (and then manually type in values for every field). You can scroll left and right between fields, with a header row identifying which field is which, and you can scroll up and down through all the lines. If you know what you want to change (such as replacing a rogue figure), this is a very easy to use editor.

For the daily summary log, the original Cumulus software includes functionality to Create Missing in its daily summary log editor, see Amending_dayfile#Create_Missing. This functionality creates an entire missing log line and will insert highs and lows whether they are extremes of source values, or extremes of derived values.

Workaround

This functionality is not designed to work out individual missing extreme figures, only to insert complete missing lines. However, we can workaround that constraint:

WORKAROUND FOR DAYFILE.TXT if required dates are present in both the standard log and dayfile.txt, but not all fields for that date exist in dayfile.txt

There are two common reasons for needing to use this, Cumulus 1 only, workaround:

To add extra derived fields now calculated by Cumulus, to past lines created by an earlier version of Cumulus that did not calculate those derived fields at the time
If you are importing into Cumulus records from other software, and that other software does not provide derived extremes (e.g. dew point, apparent temperature, heat index, rain rate, wind run) so your insert in the daily summary log file has only populated a sub-set of the fields.

The steps you need to take, to implement this Cumulus 1 only workaround:

Select a time to do this work that is at least 10 minutes, preferably a whole hour, after Cumulus has performed a daily rollover, and ensure you finish this work long before the next rollover time. This will ensure your work cannot conflict with when Cumulus 1 is updating dayfile.txt.
Take a copy of dayfile.txt original as backup,
Use the Cumulus 1 editor (in Edit menu, select Dayfile.txt screen), and let it edit the original file
Delete any days with partial information (e.g. from Cumulus versions that created fewer fields)
Click the Create Missing button
Wait while Cumulus scans all the standard log files, and for each source or derived field in those files, tracks the highest and lowest for each meteorological day that is now missing in dayfile.txt.
- As an aside, be aware that when the contents of today.ini was used to create a new line in dayfile.txt originally, the high and low that were copied across were derived from all source values that Cumulus obtained from your weather station (depending on your weather station type this might be around every minute; some weather stations provide new readings less frequently, some provide them more frequently).
- Continuing this aside, the high and low that Cumulus is now deriving are based purely on those values stored in the standard data log, by default that is just every 10 minutes.
The new lines that Cumulus 1 adds to your dayfile.txt are also added to another log file dayfileeditlog.txt, so we can access that to find the new values.
For simplicity, click OK to save the edited dayfile.txt file, and exit the editor.
Rename the amended dayfile.txt as "dayfile(generated).txt".
Create an empty text file in a suitable temporary directory, and name it "dayfile.txt",
Use an external editor to open your empty file.
- You can use a Comma Separated Value file editor, although you will find this difficult starting with an empty file
- You can use an editor designed for computer programmers or developers that can edit text file
- You can use a spreadsheet application, such as "Libre Office Calc" or "Microsoft Excel", providing you obey the editing rules defined later
Now merge in (as read-only text) the previous contents of the original dayfile.txt from the copy taken in step 2
Now merge in (where there are fields missing) just those fields from the respective lines in "dayfile(generated).txt".
Finally, copy your temporary "dayfile.txt" into the "Cumulus\data" folder, so from now on Cumulus accesses the file with the maximum number of fields present.

One note of caution:

If a required source or derived value is not present in the standard data log lines, Cumulus will write into related dayfile.txt fields zero for values, and "00:00" for time stamps, because it does not understand the concept of "Null".
Cumulus 1 does not have the functionality to retrospectively calculate derived values when it is reading source values in the standard data log line.

Using the Cumulus MX editing functionality

Cumulus MX beta version 3.0.0 (checked at build 3043) does not provide an editor
Cumulus MX Version 3.4.5 - Build 3069 onwards provides an editor
From MX release 3.9.2 - b3097 historic charts are added to admin interface
- If you use the in-built editor to update dayfile.txt, your change will be reflected in the historic graphs
- If you edit dayfile.txt outside Cumulus MX, historic graphs will not be updated until Cumulus MX is restarted

There is a dayfile.txt editor within the admin interface to edit this log file. In the Edit menu, choose the Dayfile option.

If lines in your daily summary log were created by a variety of Cumulus 1 releases (so some have less than 46 fields), you need to use Cumulus MX version 3.7.0, or later, to be sure that the provided editor will cope. The code was actually amended to be able to read lines with fewer fields at version 3.6.0, when 4 fields were added for feels like, so the total number of fields became 50.

It is recommended that nobody uses any 3.6.x version (see Updating_MX_to_new_version#If_using_a_3.5.x_release. (For historical interest only, Emergency Version 3.6.12 changed the number of fields to 54 in error)

From formal release 3.7.0, MX's dayfile.txt reverted to 52 fields. The extras are Canadian Humidity Index (Humidex). At the time of typing this, it has been said this file structure will not be changed again.

Whatever MX release you use, any line that is edited (even if it originally had fewer or more fields) will be saved with the same number of fields that release uses when it creates a line from the contents of today.ini.

Editing inside MX

The editor in MX can be found in the administrative interface by selecting Data Logs menu and Dayfile page. The Dayfile viewer/editor will display up to 10 lines at a time. When the page is first loaded, the oldest lines will be read from the file by the Cumulus MX engine, and via an application programming interface' (api) transferred to the web page where the lines are displayed using some software called datatables. That software generates a navigation section where you can navigate to First, Previous, Next, and Last, with (for a longer file) up to 6 page numbers (each containing up to 10 lines) that you can select directly.

The editor does not provide any way of inserting new lines into dayfile.txt (so you cannot correct an error when MX end of day failed and a line was not created), nor is there any way of changing the dates used by lines in the file (a very common problem reported by Cumulus users is that MX is giving them problems because not all lines in this file use the same format for the date, but this editor cannot resolve that).

There is a Refresh button that sends a application programming interface instruction asking the MX engine to resend the lines on the currently selected page via the api.

When you select a line in the provided editor, both Edit and Delete buttons are enabled.

Pick Edit, click that, and an editing dialog pops up (MX uses altEditor software for this). The pop up window does not let you change the line number nor the date, but all other fields show their current contents and you can overtype as necessary. Scroll down to see 2 buttons (how they are labelled depends on which version you are using), the left hand button ignores any edits you have made (it is labelled 'Close' or "Cancel" and simply does same effect as clicking the "x" in the top right corner), it prevents the api sending any replace message back to the MX engine. The right hand button saves your changes (even if it is labelled 'Edit' rather than "Save" in the version you are using) by using the api to send the replacement array back to the MX engine where it will replace the relevant line number before writing back to the log file.

There is no validation in the MX editor that was set up relatively quickly in version 3.4.5 as the first of 3 log file editors to plug a gap in MX functionality in earlier versions:

some fields can only accept integers, other expect decimals,
and some fields can accept negatives, others don't accept signed numbers
some fields have a minimum and/or maximum acceptable value

As all lines are passed back via an application programme interface to the MX engine, there is no validation there either, the new line replaces the old one when the whole file is recreated. It is likely that the next time MX attempts to read the dayfile.txt it will find any error. There was a third-party proposal to add simple validation into a replacement editor, that would hav

Pick Delete, click that, and a simple dialog pops up (MX uses altEditor software for this) showing all the fields in the selected line and asking you to confirm that you want to delete it. Again, the labelling on the buttons varies depending on which version you are running, one confirms the deletion (which sends the array back to the MX engine with an instruction that line number is to be deleted. Despite the MX engine getting a copy of the fields that are to be deleted, it does not validate the fields, just the line number. The button labelled 'Close' or 'Cancel' does the same effect as clicking the "x" in the top right corner, it prevents the api sending any deletion message back to the MX engine.

Important Rules when editing dayfile.txt

If you are editing dayfile.txt outside the Cumulus 1 or MX software, there is the danger of changing something that prevents Cumulus from understanding the file when it next tries to use it.

General Editing Rules

Take a copy of the file that can be reverted to if there is a subsequent problem, and you have messed up the file that Cumulus (1 or MX) is now trying to use.
Take another copy and use that for your editing, don't edit the actual file being used by the software.
- This prevents any conflicts between access by the software and access by your script or tool being used to modify the file.
- It also means that you can go back to the last working copy, you can't upset your "revert" copy.
The file must never be edited with a word processor, as they store many control and identification characters that prevent Cumulus correctly reading the values.
- It is recommended that you use either a specialised "Comma Separated Value" file editor or a text editor, both of these can be easily used.
  - These tools have the advantage that they can cope with different lines having a different number of fields depending on which version number of Cumulus created each line.
- You can use a spreadsheet tool, but if you do, there may be a number of settings to change from their defaults to ensure the file remains in a readable format for Cumulus.
  - If you do use a spreadsheet, extra field separators may be added at end of shorter lines as these make all lines end up with same number of fields.
- Don't remove any figures from fields where figures currently exist, only change one entry into another entry in same format.
Cumulus does not accept the concept of nulls, there is nothing that can be placed as a place-holder when the correct figure is not known, and empty fields are not permitted.
All figures must be within the range of sensible figures for that field (no hour 24 or higher, no signed numbers when accepted values must be positive, don't put in 200 for a relative humidity)
Make sure that any editing does not create any blank lines in the file. Cumulus assumes an empty line means end of processing.
Don't add a header line to the file, Cumulus expects all lines to be data lines.

File specific Editing Rules

The file should be saved without "Byte Order Mark", specialised text editors will include a menu where you select the encoding and can select not to include BOM.
All rows must start with date and include at least 14 further fields in correct sequence.
The (meteorological) date format uses two digits for the year.
- This is one reason why you need to edit this file using an editor that treats all fields as text (a text editor, a CSV editor, or a spreadsheet program that can be instructed not to recognise special field types).
- For spreadsheet tools (e.g. Calc in Libre Office, or Microsoft's Excel) avoid using default of recognising formats, ensure that such recognition is turned off (see image), as it is likely to change the dates to either a number representing days since e.g. 31 Dec 1899, or to change it to four figure years, and then Cumulus will no longer be able to use the log file.
Remember the month must be the middle figure in the date, USA convention cannot apply within this logfile.
The separator between the three parts of the date should be a '-' hyphen or a '/' slash, it cannot be a space.
- Whether Cumulus expects a hyphen or a slash is determined by the locale, you must keep to the same locale for the whole file, you cannot change the locale when you do an edit, nor when you update the device running Cumulus.
- Although, use of comma or point for separating parts of the date is in some locales, and therefore allowed by Cumulus, those locale settings are not recommended as these date separators can cause issues for subsequent edits.
- If you move your software (any flavour) to a new device, or you change from Cumulus 1 to Cumulus MX (or back), then you must ensure your dates still use the same separator, so all lines are consistent.
Each of the fields from date to the end of the line are separated using the list separator (e.g. a comma or semi-colon) defined for your device. After your editing it must still match what your existing dayfile.txt uses.
- If you wish to use Excel, or to use "Calc" in 'Apache Open Office', "Libre Office", or similar, you may on opening the file need to pre-select the field separator that is being used now (in this illustration comma is selected, but your file might use semi-colons between fields, don't select commas if your real numbers use comma between integer and decimal parts) and leave "Detect Special Numbers" (or whatever similar feature name your tool uses) unselected. Again third party packages processing dayfile.txt will need to recognise your field separator, and some may need to specify it. Don't forget to also select it when you save the edited file (you probably need to select "save as" or the equivalent in your tool to see the option).
Rows can vary in length but only by missing off fields at the end. The minimum number of fields after the date is 14, the maximum varies between different versions.
Each field has a pre-defined format, and the same format must always be used in that field position.
No fields will accept letters.
- Some fields (e.g. bearings, solar, humidity) are integers (see #List_of_fields_in_the_file) only take integers. Decimals are not allowed in an integer field, so no comma or full-stop can be within these fields.
- Most value fields are in real number format using your system/locale decimal notation ("x.y" or "x,y"). Trailing zeroes are not required, so you can put an integer in a real number field, you don't have to have a decimal comma or decimal point.
Although only the date and 14 other fields are mandatory, you cannot skip some fields defaulting them to null is not allowed, so you cannot add fields at the end, without adding all earlier fields.
when you do add fields beyond the 14, or however many already exist, be aware that for most derivatives what you add will represent a lowest or highest value and that must be paired with a time-stamp in the next field.
- Cumulus will only accept highest/lowest figures if each value has any related time-stamp.
Time stamp fields must always be in format HH:mm i.e. 2 digit hour in 24-hour format, followed by a colon, then 2 digit minutes
- - Be aware you will have problems if you, or your editing software, add seconds.
- If when editing, you don't know what time to quote, the convention is to use a time-stamp of your roll over time i.e. 00:00, 09:00, or 10:00, if you have not looked up the precise time.
- Except for wind gust (start of line) where an extra field is fitted in, each time field will immediately follow the value field for that parameter.
Shorter lines can have multiple field separators added at end of row added either when editing within Cumulus or when editing using a spreadsheet tool.
- Nulls (2 field separators without something between them ',,') are thus allowed at end of line, but are not allowed within the part of the line with values and time-stamps.
- If you are editing out rogue values and if you do not know the value for a particular field within the line, then type in a zero or 9999 for nulls in integer format and an extreme with opposite value (e.g. -999.9 for a signed decimal maximum, and 9999.9 for a decimal minimum) for nulls in decimal format (replace the full stops with your decimal separator).
- Beware - if you do insert zero or an obviously wrong extreme value, Cumulus will display those in any editing screen where you wish to update the all-time, monthly-all-time, this month, or this year, extremes. This can make editing by picking values in logs harder.
Cumulus itself will use zero for any parameters (e.g. solar) not provided by your station, and will repeat the last valid value if the station fails to send a value it should provide, so if a station fails to send a value for more than a day, dayfile.txt may show the same value as the previous day.
- Note that Cumulus will stop if your station fails to send what it considers as a vital reading, like pressure or temperature, so the previous point does not apply in all cases.
The row terminator for Windows is CR LF (a combination of Carriage Return represented in many character set encodings by the binary equivalent of decimal 13), and Line Feed represented in many character set encodings by the binary equivalent of decimal 10), ensure any external editor does not change the two character terminator into a single character. Similar rules apply for single character terminators used by other operating systems (Linux uses LF only, Mac uses CR only), don't let any editor you use change a single character terminator into its double character terminator.
- Problems with terminating characters are intercepted by operating system, before it reaches the software, but may still stop the software understanding the resulting file, so be careful if you edit the file on a different device to that running Cumulus.

Amending dayfile

Contents