User Manual

MESH AND BRIDGE NODES
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Screw Terminal A
Screw Terminal A is a two-position screw terminal that is used to provide power out. The
voltage is the node’s supply voltage (nominally 3V). The terminal marked with a “+” sign is the
positive voltage out; the other is ground.
The node’s microprocessor can instead use Screw Terminal A as the output of a normally open
(Form A) solid-state relay. When used as a relay, the maximum voltage that can be applied to
the terminal is 18V. The maximum load the relay can conduct is 100mA. The maximum
resistance when closed is 35ohms.
Screw Terminal B
Screw Terminal B is a two-position screw terminal that is used to read in analog voltages, digital
signals or dry contact switches. The maximum voltage that can be applied to the positive
terminal (indicated by a “+” sign) is the supply voltage of the node (nominally 3V). The other
terminal is ground.
Note
When used for dry contacts, the maximum voltage that will be applied to either
contact is +3.3V; the maximum resistance for a closed switch is 100ohms; and
the minimum resistance for an open switch is 10Kohms.