RX300 Settings
RX300, RX-RDP, RX420(RDP) and LEAF OS User Configuration Guide
For your convenience, here is a direct link for the configuration guide for RX300, RX-RDP, RX420(RDP) and LEAF OS products:
https://ncomputing.box.com/shared/static/310pp20tfhh4aqc6x4nj14sxch52q360.pdf