The 211k has both HDMI and co-ax output. Input for the 211z is the co-ax from the dish. HDMI of the 211z output goes to TV HDMI1 input. If you have an old TV without a HDMI input, you may be out of luck, unless you can find a HDMI to co-ax converter, [if there is such a thing. If there isn't, it's time for a new TV.
Our 07 Discovery has a "Video Distribution Box , a.k.a. Box with many "buttons" I composit video out the 211z to the Video Distribution Box. It sens the composite feed to the rear tv via RF thru coax. Rather antiquated but works.