Here’s an example of the PBASIC programming I created in 2012 when I used to make homemade panels. This shows the entire sequence for a zone one alarm condition, and the coding itself is divided into its own section. In this case pin 12 on the chip was used to control the output of the NAC circuit.
I used 200ms in my program to make up for the delay caused by the transistor circuit and relay used to connect the chip to the NAC, but 250ms is technically the correct value as Robert and Retired-STR-SG mentioned.