3 Power Supply Electrical Specification
The preferred method of powering the DMI15 is using PoE. Simply connect the DMI15 to a
PoE enabled Ethernet switch using a standard Ethernet cable. The DMI15 will be detected
as a PoE class 0 device by the ethernet switch. The switch will deliver up to 13W available
for the DMI15 itself shared with devices connected to the 24V outputs as well as the 24V DC
out of the DMI15. Exceeding the 13W overall power rating will result in shut down of the
power supply by the ethernet switch.
Alternatively the DMI15 can be powered using the 24V DC input which are available at the
IO connector at the front of the device (X2). If you do not use a power supply supplied by
metraTec, please make sure that your own PSU provides a supply voltage of high quality.
The DMI15 uses internal diode power OR-ing at the 24V level. The PoE power input is
converted to 24V and compared to the voltage at the 24V DC input. The higher voltage will
be used to supply the DMI as well as the IOs.
Fig. 1: Connector description of DMI15
Connector
Description
X2.1
GND
X2.2
24V DC
Tab. 1: Pinout
of DC Input at IO Connector X2
Technical Documentation metraTec DMI15
Page 8 of 18
