A stack light with a function generator, the stack light being of the type providing a set of beacon modules interlocking to each other and to a base unit by means of interlocking mechanical connectors and interfitting electrical connectors positioned at a top and bottom of each beacon module and at a top of the base unit together allowing multiple beacon modules and one base to be mechanically and electrically assembled into a tower with electrical communication between the base and each beacon module, the function generator comprising: a housing; first and second mechanical connectors positioned at a top and bottom of the housing adapted to releasably interlock with corresponding mechanical connectors of beacon modules and a base; first and second electrical connectors positioned at a top and bottom of the housing adapted to releasably interface with corresponding electrical connectors of beacon modules and a base, wherein the first and second electrical connectors each include a plurality of signal lines for providing multiple signal voltages for control of said beacon modules; a power conversion circuit adapted to receive electrical power from one of the connectors to convert said electrical power into a backbone voltage on a backbone power conductor and backbone common for use with the set of beacon modules and for providing backbone power to a function generation circuit; and said function generation circuit positioned within the housing, wherein said function generation circuit is configured to: receive said backbone power, via the backbone power conductor and backbone common, from the power conversion circuit from the second electrical connector, receive said multiple signal voltages for control of said beacon modules, generate a time-modulated signal, synchronized with the received signal voltages, for control of said beacon modules, and provide each time-modulated signal to the first electrical connector. a housing; first and second mechanical connectors positioned at a top and bottom of the housing adapted to releasably interlock with corresponding mechanical connectors of beacon modules and a base; first and second electrical connectors positioned at a top and bottom of the housing adapted to releasably interface with corresponding electrical connectors of beacon modules and a base, wherein the first and second electrical connectors each include a plurality of signal lines for providing multiple signal voltages for control of said beacon modules; a power conversion circuit adapted to receive electrical power from one of the connectors to convert said electrical power into a backbone voltage on a backbone power conductor and backbone common for use with the set of beacon modules and for providing backbone power to a function generation circuit; and said function generation circuit positioned within the housing, wherein said function generation circuit is configured to: receive said backbone power, via the backbone power conductor and backbone common, from the power conversion circuit from the second electrical connector, receive said multiple signal voltages for control of said beacon modules, generate a time-modulated signal, synchronized with the received signal voltages, for control of said beacon modules, and provide each time-modulated signal to the first electrical connector. receive said backbone power, via the backbone power conductor and backbone common, from the power conversion circuit from the second electrical connector, receive said multiple signal voltages for control of said beacon modules, generate a time-modulated signal, synchronized with the received signal voltages, for control of said beacon modules, and provide each time-modulated signal to the first electrical connector.