That’s great, I’ll have to remember that one.
This is where I use a homemade tool. A battery powered call generator box. The most recent version has up to 5 outputs, can place the calls randomly or sequentially, has adjustable “off” time and adjustable “on” time for if you know how MCE is when you have the car on test. Works for any elevator with discrete call inputs or you can put it in the COP in most cases if the call inputs are serial.