MadMan NTWB2 Installation & User Manual - 6 Nmea Operation
NTWB2
INSTALLATION & USER MANUAL
Rev 1.0
Page | 8
6 NMEA OPERATION
6.1 Overview
The NTWB2 can accept two separate wired NMEA0183 inputs and will multiplex the data received
from both inputs to a single WiFi data stream. The NTWB2 can also receive NMEA data from a
connected WiFi device and send that out to a wired NMEA0183 device. Refer to the Installation
section for connection details.
6.2 NMEA Input 1
NMEA Input 1 uses the terminals labelled ‘IN 1’ and is preset to 4800 baud rate. The baud rate for
Input 1 cannot be changed. The orange In 1 Data LED flashes whenever valid data is received.
6.3 NMEA Input 2
NMEA Input 2 uses the terminals labelled ‘IN 2’ and can be set to either 4800 or 38400 baud rate.
Use 4800 for standard NMEA0183 instrument data or 38400 for NMEA HS data such as from AIS
receivers. The orange In 2 Data LED flashes whenever valid data is received.
6.4 NMEA Output
The NMEA Output uses the terminals labelled ‘OUT’ and can be set to either 4800 or 38400 baud
rate. Use 4800 for standard NMEA0183 instrument data (e.g. to an autopilot) or 38400 when that
data rate is supported by the NMEA input of the device connected to the output.
The NTWB2’s output data rate is unrelated to the rate set for Input 2.
7 WIFI OPERATION
7.1 Overview
The NTWB2 can operate in two WiFi modes: AP (Access Point) mode or Join Mode. The WiFi mode is
selected using DIP switch 3 (OFF = AP Mode, ON = Join Mode).
Select AP Mode (
Figure 2
) when no other WiFi router is present and you want to have other
WiFi devices (phones, tablets, PCs etc.) connect to the NTWB2’s WiFi network.
Select Join Mode (Error! Reference source not found.) when you want the NTWB2 to c
onnect to an existing WiFi network such as that of an existing WiFi router on your boat.
The NTWB2 is configured to work in AP Mode out of the box without any further configuration or set
up.
7.2 Devices and TCP/UDP Connections
Up to 7 WiFi devices can connect to the NTWB2 simultaneously, although only one of them can
establish a TCP connection at any one time. It is therefore best to have the main WiFi device to be
used set to TCP with any other devices to be connected set to UDP.
Note: Attempting to make more than one simultaneous TCP connection will cause improper
operation.