Elevator car load measurement system for determining a load of an elevator car, wherein the elevator car load measurement system comprises: a plurality of at least two force sensors (40, 42, 44, 46) which are daisy-chained, and a controller for determining the load of the elevator car, the elevator car load measurement system being characterized in that each force sensor (40, 42, 44, 46) is adapted for measuring a force exerted by the elevator car on the respective force sensor (40, 42, 44, 46) and for generating a frequency signal with a square-wave form, wherein the frequency signal is proportional to the respective measured force, at least one first force sensor (40, 42, 44, 46) of the plurality of force sensors is adapted such that a first frequency signal received from the previous force sensor (40, 42, 44, 46) along the daisy chain is added to a second frequency signal generated by the first force sensor (40, 42, 44, 46) for generating an outputting a frequency sum signal, wherein the first frequency signal is added to the second frequency signal by generating a waveform edge in the frequency sum signal at a point of time if the first frequency signal and/or the second frequency signal has a waveform edge at the respective point of time; and at least one force sensor (40, 42, 44, 46) of the at least one first force sensor is adapted for forwarding the frequency sum signal to the controller. a plurality of at least two force sensors (40, 42, 44, 46) which are daisy-chained, and a controller for determining the load of the elevator car, the elevator car load measurement system being characterized in that each force sensor (40, 42, 44, 46) is adapted for measuring a force exerted by the elevator car on the respective force sensor (40, 42, 44, 46) and for generating a frequency signal with a square-wave form, wherein the frequency signal is proportional to the respective measured force, at least one first force sensor (40, 42, 44, 46) of the plurality of force sensors is adapted such that a first frequency signal received from the previous force sensor (40, 42, 44, 46) along the daisy chain is added to a second frequency signal generated by the first force sensor (40, 42, 44, 46) for generating an outputting a frequency sum signal, wherein the first frequency signal is added to the second frequency signal by generating a waveform edge in the frequency sum signal at a point of time if the first frequency signal and/or the second frequency signal has a waveform edge at the respective point of time; and at least one force sensor (40, 42, 44, 46) of the at least one first force sensor is adapted for forwarding the frequency sum signal to the controller. each force sensor (40, 42, 44, 46) is adapted for measuring a force exerted by the elevator car on the respective force sensor (40, 42, 44, 46) and for generating a frequency signal with a square-wave form, wherein the frequency signal is proportional to the respective measured force, at least one first force sensor (40, 42, 44, 46) of the plurality of force sensors is adapted such that a first frequency signal received from the previous force sensor (40, 42, 44, 46) along the daisy chain is added to a second frequency signal generated by the first force sensor (40, 42, 44, 46) for generating an outputting a frequency sum signal, wherein the first frequency signal is added to the second frequency signal by generating a waveform edge in the frequency sum signal at a point of time if the first frequency signal and/or the second frequency signal has a waveform edge at the respective point of time; and at least one force sensor (40, 42, 44, 46) of the at least one first force sensor is adapted for forwarding the frequency sum signal to the controller.