how can i get the max disp of a node?

[ocean2000]

hi ,i have a trouble to get the max disp of a node.thank you for you help.
i use the cammand to get the max disp of node 12,but it can't work ,there is not warning message,but the EnvelopeNode.out file is blank.

recorder EnvelopeNode -file EnvelopeNode.out -time -node 12 -nodeRange 1 12 -dof 1 disp