Installing the Customer Display Attaching to DP-501 Attach DM-D500 to DP-501. Required items Prepare the required items from among the following, depending on the connection pattern to use. For longer poles, use the extension support (DP-105). These are all sold separately. Base plate DM-D stand Fixing screws for RS-232C connector Power extension cable Hook and loop fasteners Extension support (Two in the case of pass-through connection) 30