[Zubersoft]

That's certainly feasible. I would just have to add code to have the slave send the request to the master device and have it respond. All the other messages are one-directional from the master device to the slaves. This would be the first message that is sent from a slave device to the master that also expects a response back. So it's not difficult to implement, it's just going to require some new code to handle that flow. 

Mike