RCM5400W is a direct replacement for RCM4400W?

[cpigilam]

Yes, It seems like ,the RCM5400W, which has the same footprint as the RCM4400W.

If you want more info about the RCM5400,go through the user’s manual at the below link
http://www.digi.com/support/productdetail?pid=4359&type=documentation