The iMatrixSpray has two electronics boards inside, which are connected at the back over an USB cable. Over this cable data is exchanged by a serial protocol. For the device to work in the standard configuration, the following parameters need to be set in the web interface:
Serial Port: /dev/tty/ACM0 (needs to be exactly this, there’s a similar entry)
Save connection setting: no (only set if you changed anything)
Auto connect on server setup: set
Communication timeout: 5 s
Connection timeout 2 s
Autodetection timeout 0.5 s
Reboot of the device required when the cable was disconnected and reconnected.