Calypso Nmea Connect Plus User Manual page 18

6.4 Connect Dedicated Power
This input is used to power the NCP with a VDC Power Supply (9-24V).
Identify the RS‐485 and Power connector and connect the wires in the corresponding
Power pins.
Keep the following in mind:
•
Signal 1. GND, is the reference ground signal of the RS485 –Port 1.
•
Signal 2. GND, is the reference ground signal of the RS485 –Port 2.
•
GND, 1.GND and 2.GND are isolated from each other, so the right signal must
be connected in each position.
6.5 Shared power between NCP and RS485 device:
If you want to use a single power supply to power the NCP and your Calypso
ULTRASONIC, you have to share the GND from the power supply between the GND of
POWER and the GND of the RS485 port. But in this case you have to take into
account that the isolation between signals is lost.
RS-485 POWER
PORT 2
RS-485
PORT 1