How to plot data from serial port against actual time in Simulink S-functions?

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Zain ul Aabidin 2015-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/179050-how-to-plot-data-from-serial-port-against-actual-time-in-simulink-s-functions

I am receiving data through serial port from a microcontroller in a custom S-function block. Microcontroller is sending data sampled data after every 100msec (but it's not constant) whereas my simulation time step is 1msec. Matlab is making a plot against simulation time that is first sample at time t=0 and second sample at time t = 1msec. But I want to make a plot with the delay equal to the incoming data rate.