Quark-elec Manual
7 of 21
2019
V1.0
The table shows that not all datagrams result in an NMEA 0183 sentence. Some datagrams are only
used to retrieve data, which is combined with data from other datagrams to create one NMEA 0183
sentence
3.2. NMEA Inputs and Outputs
Every NMEA input on the A033 is galvanically isolated (also called opto-isolation).A galvanically
isolated input prevents unwanted currents flowing between the instruments and the multiplexer. These
currents can damage equipment or interfere with radio signals and should therefore be avoided.
NMEA baud rates are set to the following default settings:
NMEA IN 1: 4800bps
NMEA IN 2: 4800bps
NMEA IN 3: 38400bps
NMEA OUT 1: 4800bps
NMEA OUT 2: 38400bps
These can be adjusted as required, using the Configuration software (see the Configuration section).
Connect the + and - terminals of the NMEA input/output on the A033 to the + and - terminals of
the output/input on the instrument (e.g., wind sensor, autopilot, chart plotter). These terminals
may also be labelled as A/B, Data+/Data-, RX+/RX-, In+/In–.
3.2.1. MNEA Inputs
A033 has three NMEA inputs called IN1 to IN3. Each input should be connected to one output device
only. These inputs are galvanically isolated from the A033 multiplexer, as specified by the NMEA 0183
standard.
Each input has an internal filter which can be configured to pass or block specific sentences from the
input devices (See the Configuration section).
A033 combines these filtered NMEA 0183 inputs with the NMEA sentences converted from the
SeaTalk input as well as WiFi and USB messages into one NMEA0183 serial data stream.
Regarding connection to external NMEA devices:
Although the NMEA 0183 standard specifies signal names, voltage levels and connection methods
clearly; in reality, this standard has been interpreted with variation between manufacturers. To ensure
A033 is not damaged please double-check the specifications of the devices before connecting them.
3.2.2. MNEA Outputs
The A033 provides two independent NMEA outputs. These NMEA 0183 outputs are capable of driving
the combined data from the inputs.
Each input has an internal filter which can be configured to pass or block specific sentences from the
input devices (See the Configuration section).
3.2.3. Addition Functions
See the configuration section below for:
Filtering input data (blocking certain data from entering the multiplexer)
