// clear
// 1-pretrigger, 2-clear, 3-reserved, 4-low power, 5-acq, 6-test, 7-pasa pulse
//write 0xA04, 0x0412
//pretrigger 2
nop
// read status
read 127, 0x0A04
// start
// 1 non-pulse, 7 pulse.
//wait 0
pretrigger 1
//wait 0
//write 0xA04, 0x0512
read 127, 0x0A04
// read status
read 127, 0x0C04
// clear
pretrigger 2
//write 0xA04, 0x0412