Hi Rafael,
It should be a Meridian C5 cable, see
Wiki - Comms Cable Pinouts note it has a DIN5 - 240 (Degree) connection at both ends and is two core cable plus screen.
I suspect with your 861v4 you were using a M5-lead connected in to the DSP speaker slave patch on the v4 and not one of the two comms sockets; this may have worked (by fluke) but it�s not the correct way to connect Meridian components.
So; source a C5-lead or buy a HD621 and a RJ45 lead so you can enjoy High-Def audio from HDMI sources? Choices, Choices

Hope this helps.
Regards,
Carl