disclosed is a tri - mode connector module comprising a module main body , a serial / parallel connector and a bus connector seat . the serial / parallel connector comprises a slot and groups of connection terminals , each including a first contact piece and a second contact piece . a foreign object enters the slot to change the connections of the first and second contact pieces , to establish serial or parallel connections . the bus connector seat comprises a rail to accommodate a bus connector and a slide clip to clip a bus rail . the connector module may further include a bus connector to connect a bus structure provided in the bus rail .