Setup
The Setup process for Cumulus is briefly mentioned in the 'readme.txt', and of course you did read that when it was displayed as part of the Cumulus installation process, but in case you did'nt this article covers some key setting-up issues.
There is a handy installation guide here that describes how the requirements vary for each make of weather station.
Dates
Cumulus does require your computer SYSTEM short date to use a format with a separator between day, month and year in whatever format suits your region e.g. dd/MMM/yy, dd-MM-yy, MM/dd/yy and dd-MMM-yy are acceptable, but ddMMMyy is not suitable as a short date format with Cumulus. Any change to your short date format later is likely to give problems.
Configuration: Settings
When Cumulus is first installed
The Setup process for Cumulus is covered in detail in the help files that are installed with Cumulus. Once Cumulus is installed: Click Start, Programs, Cumulus and select the Help. Expand the Introduction section and begin reading at "Getting Started" until you have got everything working.
When Cumulus is first installed, there is no cumulus.ini containing all your specific settings, therefore the Station settings screen is automatically displayed. There are two panels on the 'Station' screen that frequently lead to questions in the support forum - location and units - explained further below.
Location panel
Pay attention to the box labels, enter unsigned integers for degrees, minutes and seconds, then add either N or S for Latitude and either E or W for longitude.
Units of measure panel
By far the biggest decision you will make, and be held to, is the various units of measure. Select these very carefully when you are setting up.
Remember if you try to change your old data later it probably has already been rounded and applying a single conversion factor would cause inaccuracy. For instance in rainfall you can't get back exactly to millimetres to 1 decimal place from inches to 2 dp. For example, 0.01 inches is 0.254 millimetres, which rounds to 0.3 mm, but 0.02 inches is 0.508 mm, which rounds to 0.5 mm rather than 0.6.
To minimise rounding error, you need to convert the old data first into whatever precision your weather station works in (e.g. Fine Offset rainfall bucket is 0.3mm, its pressure measurement is in dPa (integer decaPascal), wind speed in tenths of metres/second and temperature in tenths of degrees Celsius), this may be different to how you have set its console display, and then convert into whatever future units you select for Cumulus before rounding. So devising suitable conversion tactics and applying to all old data could require hours of work. See discussions in support forum e.g. this Fine Offset rainfall thread, this Vantage Vue wind speed thread or search (specify station make or units you wish to change) forum.
Further changes to settings
You may find the Cumulus_Screenshots help you to find what can be edited where, although note the screens may relate to a different software version/build to that you are using. Most of the settings are fully explained in the help for each screen in the various different menu. Not all settings can be set using screens in Configuration menu, you may need to use a screen in the Edit, or View, menu or to directly edit the appropriate configuration file.
The information in cumulus.ini describes the configuration settings for the latest live Cumulus release, whether set via screens or directly by editing that file. If there are extra settings for a beta build, these will be covered in the build announcement, but once established will appear in Cumulus.ini_(Beta).
There are several configuration files and the others are for more sophisticated options such as how Cumulus communicates with particular external reporting systems.