Attached is a .pdf file that defines the meaning of the green and red LED's indications of the ROAM REN127 NM1 nodes. Those are the 3-pin nodes that do NOT have integrated dimming.
The ROAM nodes that DO have integrated dimming (aka "IDC Nodes", where 'IDC' means "Integrated Dimming Control"), such as
the REN127 DVX 0
do not have a RED indicator. They have just a GREEN indicator. In that case, disregard the portion of the attached pdf file that speaks about the RED indicator, but the portions about the GREEN indicator still hold true.