QK-A035 Manual
V 1.0
6 of 19
2021
Figure 4 Side view drawing
Power off all the devices before connecting!
3.1 Status LEDs
A035 features 12 LEDs which indicate SeaTalk
1
in, NMEA input, NMEA output, overflow, USB, WiFi,
and power status respectively. The status LEDs on the panel show port activity and system status.
•
PWR (Power):
LED light is constantly lit in red when the device is powered.
•
SeaTalk
1
:
LED will flash for each valid message received.
•
NMEA 0183 input (IN):
LED will flash for each valid message received from any of the 4 NMEA
0183 inputs.
•
OUT1-4 (NMEA 0183 outputs):
LED will flash for each valid message sent out from the related
output.
•
OV1-4 (Overflow):
LED will flash if the NMEA 0183 output experiences data overflow due to an
excessive queue, above the buffer allowance (potential data loss).
•
WiFi:
LED will flash for each valid NMEA message sent to the WiFi output.
Figure 5: LED functions
3.2 NMEA 0183 wiring - RS422 or RS232?
The A035 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). With the following tables,
the A035 can be connected to most NMEA 0183 devices, no matter RS422 or RS232 protocol.
Occasionally, for some older 0183 devices if it
still doesn’t work, consider our
The QK-AS03 connects and converts RS422 to the older RS232 and vice-versa, through a simple
connection, with no configuration needed.
3.1.1. Connecting to NMEA 0183 (RS232) devices
For RS232 interface devices, it normally has only one signal wire while GND will be used as a reference
signal. Occasionally, you may need to
swap ‘GND’ and the signal wire (TX or RX) if the following wiring
doesn’t work.
QK-A035 wires
Connection needed on RS232 device
NMEA IN+ -----
→
NMEA IN- -----
→
GND *
NMEA TX
