Comar SLR400Ni

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The SLR 400Ni is tailored for shoreline AIS signal monitoring and is one of the latest MarineTraffic AIS receivers introduced in July 2022.

This compact device integrates a dual-channel VHF receiver and operates on the Raspberry Pi mini-computer platform. Featuring built-in Ethernet, WiFi, and USB interfaces, it effortlessly connects to any wired or wireless network, allowing data streaming to up to five user-defined destinations, excluding the reserved MarineTraffic data stream.

The unit offers flexibility. It can receive and decode all AIS transmissions from vessels equipped with Class A or Class B AIS transceivers, as well as AIDS to Navigation and SART. Users can employ the receiver's web UI for local plotting or utilize the software on their computers for visualization purposes.

 

Technical Information

Receiver

2 Channel AIS receiver, for 161.975 MHz and 162.975 MHz

Class A/B, Adjacent Channel Selectivity 70dB, blocking >90dB

Sensitivity

> -112 dBm for 20% MER

Power 5V DC, 3A, USBC Power Connector
Operating Temperature -15°C to +55°C
Connector

BNC 50Ω for antenna

RJ45 Ethernet Connector

Wifi

USB 2.0 Connector

HDMI

LED

Green Power LED

2x Red Reception LED A/B

Output NMEA0183, 38.400 Baud, VDM
Protocol TCP, UDP, ARP, ICMP, TFTP, Telnet, DHCP, BOOTP, HTTP, AUTOIP
Dimensions 95x90x28 mm
Weight 180 g

 

Wiring Diagram

SLR400Ni_wiring.jpg

 

LED Status

The green LED (POWER) shows that the device is on. If no green light appears, recheck the power connection.

The two red LEDs (A/B) blinks from time to time when it receives AIS data. If one of the red LEDs does not blink irregularly, check the antenna, the coax cable and the cable connections. Its indicate that the device receive no AIS data.

The orange and green LED on the network port is off if no network cable is connected or nothing is connected to the other end of the network cable. In this case, check the network cable and the connection.

The orange LED on the network port is permanently on when a connection has been established to a network device (e.g., switch).

The green LED on the network port flashes when a connection has been established (see orange LED). It does not mean that the data is being transmitted to MarineTraffic.

 

Links

- How to install an AIS station

- How to find the AIS receiver within your network

- AIS Receiver Dashboard

- Firewall

- Hotspot Mode