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 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 is adapted for measuring a force exerted by the elevator car on the respective force sensor 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 of the plurality of force sensors is adapted such that a first frequency signal received from the previous force sensor along the daisy chain is added to a second frequency signal generated by the first force sensor 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 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 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 is adapted for measuring a force exerted by the elevator car on the respective force sensor 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 of the plurality of force sensors is adapted such that a first frequency signal received from the previous force sensor along the daisy chain is added to a second frequency signal generated by the first force sensor 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 of the at least one first force sensor is adapted for forwarding the frequency sum signal to the controller . each force sensor is adapted for measuring a force exerted by the elevator car on the respective force sensor 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 of the plurality of force sensors is adapted such that a first frequency signal received from the previous force sensor along the daisy chain is added to a second frequency signal generated by the first force sensor 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 of the at least one first force sensor is adapted for forwarding the frequency sum signal to the controller . <EOS>