The ornamental design for a remoteterminalunitcontroller, as shown and described.
FIG. 1 is a front side perspective view of a remote terminal unit controller;
FIG. 2 is a top front perspective view thereof;
FIG. 3 is a bottom front perspective view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a left side elevation thereof;
FIG. 8 is a right side elevation thereof; and,
FIG. 9 is a rear elevation view thereof.
The broken line showing of the remote terminal unit is for the purpose of illustrating environmental structure and forms no part of the claimed design.