A method for controlling of a serial data bus system wherein the data bus system is provided with: a bus line; a bus master connected to the bus line; and a plurality of bus nodes serially connected to the bus line; wherein the plurality of bus nodes comprise: at least two addressable bus nodes receiving addresses in an addressing phase; and no or at least one standard bus node which has an already fixed address without going through an addressing phase; wherein the method comprises: the addressing phase for assignment of addresses to at least one of the two addressable bus nodes, and an operating phase for operating the data bus system after termination of the addressing phase; wherein in the addressing phase, at least two of the plurality of bus nodes feed into the bus line a respective current flowing to the bus master, and wherein the plurality of bus nodes comprise: a first bus node connected to the bus line at a site upstream of the bus master and closest to the bus master; a last bus node connected to the bus line at a site upstream of the bus master and most remote from the bus master; and no or at least one middle bus node connected to the bus line between the first bus node and the last bus node; wherein: each of the at least two addressable bus nodes receives an address assigned by the bus master during the addressing phase and comprises a current measuring circuit connected to the bus line and a controllable bypass switch connected in parallel to said current measuring circuit; and each of the standard bus nodes, if available, having the respective address that is fixed before performing the addressing phase; wherein, in said method, in the addressing phase, an address is assigned to each addressable bus node in an opened state of the bypass switch, and in the operating phase, the current measuring circuit of each addressed addressable bus node is bypassed by closing the bypass switch; characterized in that, in said method, in the addressing phase, each addressable bus node that has not yet been assigned an address during the addressing phase, furthermore feeds into the bus line a respective addressing current flowing to the bus master, wherein the respective addressing current flows through the current measuring circuit of the respective addressable bus node that has not yet been assigned an address. a bus line; a bus master connected to the bus line; and a plurality of bus nodes serially connected to the bus line; wherein the plurality of bus nodes comprise: at least two addressable bus nodes receiving addresses in an addressing phase; and no or at least one standard bus node which has an already fixed address without going through an addressing phase; at least two addressable bus nodes receiving addresses in an addressing phase; and no or at least one standard bus node which has an already fixed address without going through an addressing phase; wherein the method comprises: the addressing phase for assignment of addresses to at least one of the two addressable bus nodes, and an operating phase for operating the data bus system after termination of the addressing phase; wherein in the addressing phase, at least two of the plurality of bus nodes feed into the bus line a respective current flowing to the bus master, and wherein the plurality of bus nodes comprise: a first bus node connected to the bus line at a site upstream of the bus master and closest to the bus master; a last bus node connected to the bus line at a site upstream of the bus master and most remote from the bus master; and no or at least one middle bus node connected to the bus line between the first bus node and the last bus node; a first bus node connected to the bus line at a site upstream of the bus master and closest to the bus master; a last bus node connected to the bus line at a site upstream of the bus master and most remote from the bus master; and no or at least one middle bus node connected to the bus line between the first bus node and the last bus node; wherein: each of the at least two addressable bus nodes receives an address assigned by the bus master during the addressing phase and comprises a current measuring circuit connected to the bus line and a controllable bypass switch connected in parallel to said current measuring circuit; and each of the standard bus nodes, if available, having the respective address that is fixed before performing the addressing phase; each of the at least two addressable bus nodes receives an address assigned by the bus master during the addressing phase and comprises a current measuring circuit connected to the bus line and a controllable bypass switch connected in parallel to said current measuring circuit; and each of the standard bus nodes, if available, having the respective address that is fixed before performing the addressing phase; wherein, in said method, in the addressing phase, an address is assigned to each addressable bus node in an opened state of the bypass switch, and in the operating phase, the current measuring circuit of each addressed addressable bus node is bypassed by closing the bypass switch; characterized in that, in said method, in the addressing phase, each addressable bus node that has not yet been assigned an address during the addressing phase, furthermore feeds into the bus line a respective addressing current flowing to the bus master, wherein the respective addressing current flows through the current measuring circuit of the respective addressable bus node that has not yet been assigned an address.