His finger hovered over the Download Changes button.
The pneumatic system that powered the door locks and levelers shared a compressor with the building’s HVAC dampers—which were also controlled by the SAIA DDC. Marco scrolled to the HVAC subroutine. A week ago, a programmer had remotely patched the damper logic to improve energy efficiency. The new code was aggressive: on cold mornings, it would close all dampers to trap heat, spiking air pressure in the main line. saia ddc
The yard manager’s voice crackled over the radio: “Marco, I have twelve reefers idling at the east wing. Dispatch says if we don’t move them in the next twenty minutes, we start paying detention fees by the minute.” His finger hovered over the Download Changes button