First of all, you give us no information with which to answer.

1. What brand and model of remote are you attempting to use/program.
2. Model# of TV would be helpful.
3. From what I have found in this brief thread, it appears a delay should be instituted between character transmission of at least 200ms. In the control4 world, the delay should not have "" around it while building a one way driver. The ocotothorpe delay is part of the proxy. The code you wish to send would look like $0D #200 $0A or "INPUTSELECT" #200 "HDMI1".