Yesterday Jim and I resurrected the hardware watchdog (HWWD) system on the DTS. It did not take too much work as the system had been pretty much left intact. We hooked up the ADC and DAC lines to the x1susey chassis and reconfigured x1boot to PXE boot the new faster computer which is running as x1susey. This front end is running the x1iopsuseywdt  and the x1susetmywdt models. We did a quick test of setting the countdown timer to 2 minutes and then disabling the OSEM LEDS (via relay unit). After 2 minutes the HWWD zeroed the SEI enable signals. Restoring the LEDs and pressing the RESET button restored the SEI drives.

I went through the wiring and  have made a new as-built drawing as sheet 2 of https://dcc.ligo.org/D1300475