The latest model of the DP-DMX20L has the option to be used as a dimmer or power pack. You can switch each individual channel to work in either of the two modes.
Search through the menu and it will read
C1 - d or s
C2 - d or s
C3 - d or s
C4 - d or s
*d = dim
*s = switch
Send me a private message with your serial number and I'll tell you which model you have