Sony MAVE-F555 Operation Manual page 93

Support for connection of multiple MAVE-F555 units to a single MAV-555
Using the TO MAV (PARALLEL I/O) connector of the MAVE-F555, you
can connect more than one MAVE-F555 to a single MAV-555, and with
different MAVE-F555 units you can easily control different ports of the
MAV-555.
For example, when the MAV-555 has a 1 IN/3 OUT configuration, you can
configure a distribution system so that while recording on a line input to the
MAV-555, you can carry out file assignments on the three ports P1 to P3 from
the three corresponding MAVE-F555 units.
1-3 (E)
Chapter 1 Overview