I think a
512 remote extender will do that for all the DSP.
Config the master DSP as controller.
One MSR is needed.
Connect the 512 to:
1) DSP33 or DSP3100 (legacy DSP that has SPDIF input)
RCA cable from source to the master DSP
S-lead between the DSP 512 placed at source is connected to a M-lead with a female DIN240 degree connection instead of the DIN240degree plug.
The other end of the M-lead go in the master DSP.
OR 512 place at speakers
The DIN240 degree plug of the 512 get changed to a DIN180 degree plug (direct in the master DSP).
2) DSP3200 or DSP3300 (SL DSP) your audio source is SPDIF with a AC12 or Reviver.
AC12 need a RCA cable from source(512 plugs direct in AC12)
Reviver need female DIN240 degree connection for 512 (instead DIN180 plug).
3) If your source has an AES (digital symetrical output), then you can do a pure cable/adapter solution like:
XLR plug (connected at your source) >>>>cable to>>> Master DSP with RJ45 plug(for audio input).
Second cable has a DIN female 240 degree connector for the remote extender on one end and the other end of the cable get mixed/add to the RJ45 plug of the first cable (comms).