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TX-SDK-V2 Ultrasound Kit: Trigger Signal and Time Interval of TX Signal

I have posted a topic a while ago in which I had questions about the power supply rails related to the referred development kit. I already addressed that issue. I can now generate the pulser waveform and drive an ultrasound transducer. Nevertheless, I cannot find a trigger signal to the pulser and tx/rx switch outputs. The signals are displayed at random times. I think there must be a test point or other signal on the board to trigger the output signals. Do you have any advice as to how to get the trigger signal?
Furthermore, I would like to know if it is possible to adjust the time interval of the periodic TX_EN signal beyond the range of 10-100 ms. The desired output would be a TX signal with a frequency of 1 kHz.
Thanks,
Gabriel.