I did not get input 2 to work satisfactorily. If I recall it would not work as an alarm input. Looking around on other forums I have the impression this is a common problem. I also found out that HA is using OZW 1.4, and the latest version is OZW 1.6. I have decided to leave it for now and only use one input. Whilst it is a nuisance, my application is working with only one input used.
I don’t want to spend any more time investigating until the version of OZW used by HA is updated to use the latest.