CME H2MIDI PRO User Manual page 5

The green indicator light will stay on when the power is on. When
-
sending messages, the indicator light of the corresponding port will
flash rapidly.

5-pins DIN MIDI input port and indicator
The MIDI IN port is used to connect to the MIDI OUT or MIDI THRU
-
port of a standard MIDI device and receive MIDI messages.
The green indicator light will stay on when the power is on. When
-
receiving Messages, the indicator light of the corresponding port will
flash rapidly.

USB-A (Up to 8x) host port and indicator
The USB-A host port is used to connect standard USB MIDI devices
that are plug-and-play (USB class compliant). Supports up to 8-in-8-out
from the USB host port through a USB hub (if the connected device has
multiple USB virtual ports, it is calculated based on the number of ports).
The USB-A port can distribute power from the DC or USB-C port to the
connected USB devices, with a maximum current limit of 5V-500mA. The
USB host port of H2MIDI PRO can be used as a stand-alone interface
without a computer.
Please note: When connecting multiple USB devices through a non-
powered USB hub, please use a high-quality USB adapter, USB cable and DC
power supply adapter to power the H2MIDI Pro, Otherwise, the device may
malfunction due to unstable power supply.
Please note: If the total current of USB devices connected to the USB-A
host port exceeds 500mA, please use a self-powered USB hub to power the
connected USB devices.
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