The Elk M1 is getting temperatures from the RCS thermostats via XSP expander BUT is not able to send any settings to the units. The system was working at one point, then started working sporadically. I contacted Brad at Elk support and he suggested upgrading the firmware. Did that and now NO settings are sent. I have sent pictures of the XSP board settings to Brad for review, thinking that perhaps the firmware upgrade might be less forgiving than previous software for improper jumpers, etc. Just curious to see if anyone else in the field has run into a similar issue or has any ideas on best ways to troubleshoot this...I am happy to provide snapshots of the XSP board if desired...