Connect your PC to the PCO5 via the USB-CAB. Click then "Debug" . The top feature here is the "Forced I/O" – you can manually override a sensor value to test if your alarm logic works.

: Covers advanced specifications, including I/O configurations, serial connections, and firmware update procedures. pCO Programming Manual for AC Units

: While designed primarily for the newer c.pCO family, it is the modern successor to 1tool.