Activity › Forums › Blackmagic Design › Compact Video Hub RS422 Problems Blackmagic Design Compact Video Hub RS422 Problems Gene Brian replied 13 years, 1 month ago 7 Members · 11 Replies Gene Brian March 26, 2013 at 10:33 pm Can anyone provide a copy of the Leitch Serial Pass-Through Protocol. I cannot find any instance of it anywhere, including the Harris site. Thanks in advance. Gene Page 2 of 2 ← 1 2 Reply to this Discussion! Login or Sign Up Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me Reply to this Discussion! Login or Sign Up