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It's a secondary port for RS485, which is multidrop. You can ignore it.

Try this: https://github.com/SequentMicrosystems/rtd-rpi

Almost all the terminal blocks we use are 3.5mm. We use only Chinese brands, which are available in China and are significant cheaper...

You have two identical cards, both V7.0, and you install the battery in 2 different positions just to try it. And you expect the card...

The battery case it's an auxiliary piece of hardware which can be mounted either way. The sign on the PCB silkscreen is MAJOR. Cannot...

I do not see the + sign reversed. On both boards, keeping the board with the GPIO connector on top, the + sign is on the left. The two...

Are the 2 boards same version? Can you send pictures please.

If the battery holders are installed the same way on both cards, they are both right or both wrong. There is a large + sign on the left...

Did you use the same battery for both boards? When you power the watchdog, if the battery voltage is under 4.2V, the charger should...

Unfortunatelly we do not have fast fuses on the solid state relays. The resettable SMD fuses tend to be slow. The fast fuses fast...

One lot has been shipped from the factory yesterday. Should be in store in about one week. We will notify everybody when we have it.