The codes for a Sony RM V310 universal remote controller are three-digit numbers assigned to each component and its brand. A user needs the code to each component she wants to program.
Access Sony’s support website to locate the codes. Choose the Remote Codes and Programming Icon, and then enter RM V310 in the search box. Locate the type of component you wish to program from the left column, and use the drop-down menu in the right column to choose your brand. If more than one code is listed, try them all until one works. Sony’s support website has instructions on how to program your remote.