I have added a total of 4 ADC-S40-T sensors to my Qolsys 4 panel using Z-Wave. The fourth sensor reported as having been added but reports no temperature humidity data.
Is there a limitation on the number of sensors?
No Limit on how many you can pair (aside from overall Z-Wave device limits). Im only seeing 3 in Alarm.com. Try deleting and re-adding the RTS in quesition. Any change?