====== First test ======
  * It seems the issue of board initialization is still there, but moves to board 4 ...
  * Still shows only 4 out of 8 pulses in a train
  * will try with different triggers
<code bash>
daq@gm2-01:scripts $ BUTool -q 192.168.30.89
Registered device: G2QUAD
>write TRIGGER.STATUS.ENABLE_PULSERS 1
Write to register TRIGGER.STATUS.ENABLE_PULSERS
>write TRIGGER.FREE_RUN.EN_FR_TRIG 0
Write to register TRIGGER.FREE_RUN.EN_FR_TRIG
>write TRIGGER.FREE_RUN.EN_EXT_TRIG 1
Write to register TRIGGER.FREE_RUN.EN_EXT_TRIG
>read SYSTEM.SYNTH_DATE
                                 SYSTEM.SYNTH_DATE: 0x20201008
>read ADCBOARD.1.*SYNTH_DATE
                      ADCBOARD.1.SYSTEM.SYNTH_DATE: 0x20201005
>read ADCBOARD.2.*SYNTH_DATE
                      ADCBOARD.2.SYSTEM.SYNTH_DATE: 0x20201005
>read ADCBOARD.3.*SYNTH_DATE
                      ADCBOARD.3.SYSTEM.SYNTH_DATE: 0x20201005
</code>
====== Trigger from a waveform generator ======
  * The function generator is programmed to output a burst of 8 pulses: 3 Vpp, 1.5 V offset, 10 ms separation every 1.4 s. Pulse width is adjustable. This WG has minimum 6 ns rise time and fall time.
  {{work:gm2:esq:bu_controller:pxl_20201008_190541385.jpg?600x0}}
  * Output 1 & 2 are in-sync
  {{work:gm2:esq:bu_controller:pxl_20201008_190526636.jpg?600x0}}
  * Output 1 is kept on channel 1 of the scope, output 2 goes to the ext. trigger input of the BU controller
====== Tweaking trigger pulse length ======
Channel 1 on scope is the synced signal of ext trigger, channel 2 is discharge pulse from ADC board 1.

  * < 50 ns, still shows only 4 pulses. All pulses from 12 ns to 50 ns worked.
{{work:gm2:esq:bu_controller:pxl_20201008_191532389.jpg}}
{{work:gm2:esq:bu_controller:pxl_20201008_191547871.jpg}}
{{work:gm2:esq:bu_controller:pxl_20201008_191643263.jpg}}
{{work:gm2:esq:bu_controller:pxl_20201008_191710289.jpg}}
{{work:gm2:esq:bu_controller:pxl_20201008_191730525.jpg}}
  * 54 ns, picking up random pulses among 8, but never 2 consecutive ones
{{work:gm2:esq:bu_controller:pxl_20201008_191758570.jpg}}
{{work:gm2:esq:bu_controller:pxl_20201008_191806670.jpg}}
{{work:gm2:esq:bu_controller:pxl_20201008_191757168.jpg}}
  * 56 ns, still can pick up pulses
{{work:gm2:esq:bu_controller:pxl_20201008_191818632.jpg}}
{{work:gm2:esq:bu_controller:pxl_20201008_191821833.jpg}}
  * 60 ns, no trigger picked up at all
===== Different pulse separation =====
Still only 4 pulses, there seems to be some change in phase.
{{work:gm2:esq:bu_controller:pxl_20201008_195535792.jpg}}{{work:gm2:esq:bu_controller:pxl_20201008_195613934.jpg}}{{work:gm2:esq:bu_controller:pxl_20201008_195009724.jpg}}{{work:gm2:esq:bu_controller:pxl_20201008_194714818.jpg}}
