A connector includes a temporary lock member having a mating arm provided at a connector housing and an arm mating hole provided at a cover body of a connector cover. When one requires to address a great number of databases, the time to accede to each of them increases considerably considered the necessity to repeat the information to ensure the good reception of messages. One of the rails may be hollow or open on one side for receiving part of the adjusting device. The personality data of a particular one of the response units is changed in order to change which of the base units that response unit communicates. The SAS expander marks its label invalid or discards it and forwards the OPEN frame to the egress port where the next SAS expander will look for the first valid label. The protective member is formed with a through-hole facing the electrode.