IS20 Manual
V 1.0
8 of 23
2023
4.1. Power and NMEA 0183 input/output connector
The IS20 uses industry standard six-core screened M12 cable for power supply and NMEA 0183
input/output connection.
It operates on a 12V DC power supply. To properly connect the IS20, please follow these guidelines:
Connect the red wire to the positive supply (12V) using a 2-amp fuse, and securely connect the black
wire to the ground (GND). It is crucial to avoid connecting any of the other data wires to the 12V power
source, as doing so could potentially damage the device. Rest assured, the IS20 is equipped with
reverse polarity protection, ensuring the device remains safeguarded in the event of a faulty installation.
The IS20 can also be powered through the NMEA 2000 port using an N2K cable. When utilizing an
NMEA 2000 cable, we advise leaving the red and black wires open (please use tape or a suitable
protective measure to safeguard the header wire).
The NMEA 0183 input and output of the IS20 are galvanically isolated, in accordance with the NMEA
standard. Galvanic isolation, also known as opto-isolation, effectively prevents the flow of unwanted
currents between the instruments and the IS20. This protective feature against potential damage and
significantly reduces interference with radio signals.
The NMEA 0183 input of the IS20 supports two different baud rates: 4.8kbps and 38.4kbps. These baud
rates can be selected from the settings page, allowing you to choose the appropriate data source for the
IS20. The selected data source provides real-time data to the IS20, which is then displayed on the
screen for easy monitoring.
Furthermore, the IS20 has the capability to transmit (repeat) data from the NMEA 0183 input and send it
to other devices using NMEA 0183 wires. The output baud rate can be configured via the settings page.
If you wish to forward the data to a computer, you will need a TTL to USB adapter (not included). This
enables the input data to be displayed on software running on your computer, enhancing data visibility
and analysis capabilities.
4.2. Type-C connector
The IS20 is supplied with a type-C USB connector and USB cable for settings and upgrade its firmware.
The USB cable can be linked directly to a USB port on the Windows PC.
4.3. NMEA 2000 connector
The IS20 provides a standard male NMEA 2000 connector.
Data sources provide live data to the system. Apart from NMEA 0183 input port, the IS20 can also be
connected to a NMEA 2000 network to receive NMEA 2000 data. The NMEA 2000 connector also
provides the power supply to IS20.
4.4. WiFi antenna
The supplied WiFi antenna needs to be connected to the SMA connector on rear. Connectivity in Station
Modes on 802.11 b/g/n provides WiFi input of all messages from a server (e.g. a wireless router). This
WiFi connection can also be disabled by setup into standby mode.
Connect the antenna by screwing them in clockwise until hand tight.
