Yes, only one way. I use it purely for reading the status of the alarm and to automate things based on that.
If you want two way for the possibility to arm and disarm the alarm there is no Ajax supported solution. You could achieve it by stripping an Ajax SpaceControl remote and solder it to a remote controlled relay. For example a Sonoff or similar and then connect that to HA. But you need to understand the security implications of doing this.