QK-A035 Manual
V 1.0
8 of 19
2021
27
STMTW
Water temperature
50
---
GPS latitude, value stored
51
---
GPS longitude, value stored
52
---
GPS speed over ground, value stored
53
STRMC
Course over ground. RMC sentence is
generated from stored values from other GPS
Related datagrams.
54
---
GPS time, value stored
56
---
GPS date, value stored
58
---
GPS lat/long, values stored
89
STHDG
Magnetic heading, including variation (99)
99
---
Magnetic variation, value stored
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.
3.4 NMEA Inputs and Outputs
Every NMEA input on the A035 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: 4800bps
•
NMEA IN 4: 38400bps
•
NMEA OUT 1: 4800bps
•
NMEA OUT 2: 4800bps
•
NMEA OUT 3: 38400bps
•
NMEA OUT 4: 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 A035 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
–.
3.3.1 NMEA Inputs
The A035 has 4 NMEA inputs called IN1 to IN4. Each input should be connected to one output device
only. These inputs are galvanically isolated from the A035 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).
The A035 combines these filtered NMEA 0183 inputs with the NMEA sentences converted from the
SeaTalk¹ input as well as WiFi and USB messages into one NMEA0183 serial data stream.
Regarding connections to external NMEA devices:
