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The Guru Hub has the following interfaces for connecting external
devices:
1 x M-Bus master node, which can read up to five M-Bus slave
devices such as heat or electricity meters. For a list of compatible
meters, please check the website: www.gurusys.co.uk. Note
that most M-Bus devices are polarity independent so it does not
matter which wire goes to which M-Bus terminal.
1 x Pulse Input, compatible with the “pulse output” terminals on
many utility meters. Only one pulse device can be connected,
and it must conform to the following specification:
Pulse output type Volt-free switch (“dry contacts”)
Pulse ON Switch closed (<50kΩ) for > 0.5 milliseconds
Pulse OFF Switch open (>2MΩ) for > 10 milliseconds
Pulse rate Up to 10 Hz
Table 1. Pulse device specification
1 x Analogue Input, which measures voltage in the range 0 to 5V.
A 5V reference signal is also available on the Hub’s terminals.
3 x Relay Outputs, which can switch mains or other loads (up to
3A). Each relay is controlled independently by the Hub, based on
account balances or other logic (depending on how the Hub is
configured). All three relays have “normally open” contacts. Relay
1 also has a “normally closed” contact.
Auxiliary mains (live and neutral) terminals are provided within the
Hub for powering small external devices such as valves. These can
be wired through the Hub’s relay terminals if required.
Connected devices
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