An electronic tripping device for a circuit breaker contains circuitry for simulating the response curve of a fuse. The query is run on a server computer and the resulting records are then transmitted to a client computer as script variables in a header of an HTML document. The control circuit may be configured to detect a pending PIO operation during a DMA operation and interject the PIO operation onto a shared path during the same clock cycle as or the first clock cycle following the detection of the pending PIO operation. In addition, the robot incorporates safety features for preventing collisions with the resident; and the robot may audibly announce andor visibly indicate its presence in order to avoid becoming a dangerous obstacle.