Adaptation unit for digital matrix ZES-22 that allows the system to inject up to 8 MPS-8 microphones, with or without expansion keyboards. It has a bus power input to use the MPS series microphones without a local source, only connected by a bus cable. It has protection against short-circuit and wrong polarity. The ZES-22ACSI is coupled directly to the ZES-22 unit, allowing direct connection of an ACSI bus.
