Nmea Input And Output Connection; Nmea 0183 Default Baud Rates; Nmea 0183 Rs422 / Rs232 - Quark-Elec QK-A024 Manual

QK-A024/26 Manual

3.5. NMEA input and output connection

NMEA 0183 input/output ports allow for connection to NMEA 0183 instruments and a chart plotter.
The built-in multiplexer combines the input NMEA 0183 data (e.g. wind/depth) with the AIS and GPS
(A026) data and sends the combined data stream to all outputs, including an NMEA 0183 output port.

NMEA 0183 Default Baud Rates:

'Baud rates' refer to the data transfer speed. When connecting two NMEA 0183 devices, both devices'
baud rates, must be set to the same speed.
•
A024/26 input port's default baud rate is 4800bps as it is usually connected to low speed NMEA
format data instruments, like heading, sounder or wind/depth sensors.
•
A024/26 output port's default baud rate is 38400bps. The connected chart plotter should be
configured at this rate to receive the proper data as AIS data requires this higher speed.
These are the default baud rate settings and are most likely to be the baud rates required, however, both
baud rates are configurable if required. Baud rates can be adjusted using the Configuration software.
(See Configuration section)

NMEA 0183 RS422 / RS232:

This product uses the NMEA 0183-RS422 protocol (differential signal), however some chart plotters or
devices may use the older NMEA 0183-RS232 protocol (single-ended signal).
Check which protocol your connecting NMEA devices (e.g. Chart plotter/wind sensor) use. If you are
unsure whether your connecting devices use the NMEA 0183 RS422 or RS232, the input/output
connections on the device will give you some indication.
Unfortunately, manufacturers who use the older RS232 protocol are not consistent in their product
labelling. The following table may help you identify which protocol your product uses, however always
check the manual to be certain.
RS422 (Differential)
TX+ and TX- / RX+ and RX-
If your connecting device uses the older RS232 protocol, use a QK-AS03 Protocol Bridge for your
connection. The QK-AS03 connects and converts RS422 to the older RS232 and visa-versa, through a
simple connection, no configuration needed.
V 3.0
RS232 (single-ended)
TX+ and TX- (GND)
TXa+ and TXa- (GND)
Output +Ve and –Ve
Occasionally older NMEA 0183 RS232 devices are labelled like
RS422 (TX+ and TX- / RX+ and RX-) so check the products' manuals.
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/ RX+ and RX- (GND)
/ RXa+ and RXa- (GND)
Input +Ve and –Ve
/
2020