Did you check the online user manual? http://rayshobby.net/?page_id=192
Master (or pump) station is a built-in feature of the OpenSprinkler firmware. You can designate any of the first 8 stations as a master / pump station (which turn on when any other station is on), and you can fine tune the timing when the master station turns on.
We are currently on vacation till Sunday, June 1. Orders placed during this time will be shipped on Monday, June 2.
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