Power Supply - Logic IO RTCU NX-900 Technical Manual

RTCU NX-900 Technical Manual V1.01
Advanced M2M/IIoT Gateway

Power supply

The RTCU NX-900 device can be supplied with either 100-260VAC (50/60Hz) or 8-36VDC or both
supply types simultaneously.
The RTCU NX-900 also contains an internal high capacity backup battery, which will supply the
RTCU if the external power should fail or be disconnected. By default, the RTCU NX-900 is
powered down when a power fail occur. This setting, however, can be changed. Please consult the
RTCU-IDE on-line help for more information.
When the wakeup/ignition input is activated with a logical high, the RTCU NX-900 device will
wake up if it was in power down mode.
There are five different ground labels: External Ground (XGND), Signal Ground (SGND), Digital
Ground (GND), Analog Ground (AGND) and AC power ground (PE). The signal, digital and
analog grounds are filtered from the power ground. External ground must only be used as a DC
power supply return path. The AC ground is used in order to have a common reference between
external AC powered system and the internal system. The digital ground is used as ground
reference for digital I/O's, signal ground is used as ground reference for serial interfaces, and the
analog ground is used as a low noise analog ground reference for the analog inputs.
Dual Supply Note:
The RTCU NX-900 can be supplied with both VAC and VDC at the same time. The device will run
on the VAC supply if the VDC supply voltage is < +24VDC. If the VDC supply voltage is higher it
will run on the VDC supply.
Please refer to the RTCU on-line help for information on how to check the supply type from within
an application.
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