Okay, maybe I misread your original e-mail.
By "without the ougoing plug," do you mean that it doesn't have an attached cable?
That's the way they all are (to my knowledge).
Perhaps you are confusing the CM15a with the CM19A (small, black, and has the cable attached).
THAT one is ONLY RF, and has no direct PLC (powerline) abilities. It can transmit to the pwoerline using a TM751 or RR501 RF receiver, but it cannot receive powerline commands. It also doesn't have any memory in it. Everything must be run from the Pc.