It is possible to install up to 15 keypads on the DS7400XI V4 control panel. Keep in mind the current draw of the keypads that have been selected for installation and the current supplied by the panel. An AUX power supply may be required under certain circumstances where current draw of the keypads exceeds the DS7400 XI V4 current rating.
**Note: Keypads addressed 11 -15 must be connected to the option bus. If using a DS7420 or DS7420i - only keypads 11- 14 can be used because the DS7420 or DS7420i has a fixed address of 15.