Abstract: A valve operating method for a sprinkler system with a plurality of electrical valves is disclosed. The method includes the following steps: receiving a user generated query signal; generating a first set of the control signals to a driving circuit of the plurality of electrical valves of the sprinkler system in response to the query signal; generating a detection signal successive to the first set of the control signals; orderly sending the detection signal to the plurality of solenoid valves; and sensing a voltage level of a sensing terminal of the driving circuit, and obtaining a sensing result accordingly. A first sub-circuit of the driving circuit is disabled in response to the first set of the control signals. The valve control device include electronic parts to implement the above-mentioned steps is also disclosed.

Abstract: A power line Ethernet adaptor is suitable to be applied to an external module including a first connector. The power line Ethernet adaptor includes a housing, a cover and a circuit board. The housing has an accommodating space. The cover is movably connected to the housing to move between an on-position and an off-position. When placed at the off-position, the cover covers the accommodating space. The circuit board is disposed in the accommodating space and has a power line Ethernet module and a second connector. When at least a part of the external module is disposed in the accommodating space, the first connector and the second connector are electrically connected to each other to establish the signal connection between the external module and the power line Ethernet module, and the cover also covers the external module when placed at the off-position.