QK-A035 Manual
V 1.0
7 of 19
2021
TAKE CARE: There may be two GND connections on your NMEA 0183-RS232 device.
One is GND for the NMEA Connection, and one is GND for Power.
Ensure you check the above table and your device’s documentation carefully before connection.
3.1.2. Connecting to NMEA 0183 (RS422) devices
For RS422 interface devices, these wires need to be connected
3.3 SeaTalk
¹
The built-in SeaTalk
1
to NMEA converter translates SeaTalk¹ data into NMEA sentences. The SeaTalk¹
port has 3-pin terminals for connection to the SeaTalk¹ bus. Ensure the wires are connected correctly
before powering up your devices as an incorrect connection could damage the A035 and other devices
on the SeaTalk¹ bus.
The SeaTalk¹ converter converts the Seatalk¹ messages as per the conversion table below. When a
SeaTalk¹ message is received, the A035 checks if the message is supported. When the message is
recognized as being on the SeaTalk¹ data table (below), the message is extracted, stored, and
converted to an NMEA sentence. Any unsupported datagrams are ignored. These converted NMEA
messages are filtered and then combined with NMEA data received on the other inputs.
This function allows the NMEA multiplexer to listen on the SeaTalk¹ bus. Only one SeaTalk¹ input is
needed since the SeaTalk¹ bus is a single-cable system that connects all the instruments together
through one cable. The SeaTalk¹ to NMEA converter in the A035 works in one direction only. No NMEA
sentences are converted into SeaTalk¹.
Supported SeaTalk Datagrams
SeaTalk
NMEA
Description
00
STDBT
Depth below transducer
10
STMWV Wind angle, (10 and 11 combined)
11
STMWV Wind speed, (10 and 11 combined)
20
STVHW
Speed through water, includes heading when
present
21
STVLW
Trip mileage (21 and 22 combined)
22
STVLW
Total mileage (21 and 22 combined)
23
STMTW
Water temperature
25
STVLW
Total and Trip mileage
26
STVHW
Speed through water, includes heading when
present
NMEA OUT+ -----
→
NMEA OUT- -----
→
GND *
NMEA RX
* Swap two wires if the A035 does not work.
QK-A035 wire
Connection needed on RS422 device
NMEA IN+ -----
→
NMEA IN- -----
→
NMEA OUT+ *
NMEA OUT-
NMEA OUT+ -----
→
NMEA OUT- -----
→
NMEA IN+ *
NMEA IN-
* Swap two wires if the A035 does not work.