Hi Henry
You have to download the Defender TD5 manual. AFAIK there is no official manual for the TD5 discovery.
Mark
Thank you very much for the useful documents!I have them, see if you can download them with this link:
https://onedrive.live.com/redir?resid=64D92046ECEC852!19264&authkey=!AP-qE6wFZq1u_zY&ithint=folder,pdf
it is from my personal onedrive