The controller 212 may be coupled with a current monitor 220 and voltage monitors 230, 232. The current monitor 220 may be configured to monitor current on the connection line 200 and to generate an output signal (current level signal) corresponding to the current of the connection line 200 to be sensed by to the controller 212. In an example, the current monitor 220 may include two input signal lines 250, 252 connected to the connection line 200 and an output signal line 254 connected to the controller 212. The current monitor 220 may include a current sense amplifier 224 connecting to the two input signal lines 250, 252. The current monitor 220 may also include a sense resistor 222 connected along the connection line 200 between the two input signal lines 250, 252. The current sense amplifier 224 may measure the current on the connection line 200 based on the sense resistor 222, and provide a signal (current level signal) on the output signal line 254 to the controller 212. The signal on the output signal line 254 may be a voltage representative of the detected current on the connection line 200.