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System Conguration | GN70MX610/MX612 Operator and Installation Manual
NMEA 0183 output over junction box
NMEA port selection is available only when a MX61xJB junction box is connected in the N2K
network. The MX610JB has four RS-422 NMEA 0183 data ports while the MX612JB has twelve
RS-422 NMEA 0183 ports. When the GN70/MX61x CDU senses the presence of the MX61xJB
junction box, it will provide a list of port numbers based on the CDU model. Limit the
number of NMEA messages to eight per port.
The junction box supplies the power used by devices connected to the NMEA 2000 bus.
When an MX smart antenna is connected in Ports 3 & 4 of the junction box and selected as
source of position, port 3 will be grayed out in the list. The operator will be able to control
ports 1 and 2 only.
To activate the NMEA -0183 port, use the procedure below:
1. Press the MENU key.
2. Turn the rotary knob to scroll down to Tools & Settings menu
then press ENT.
3. Scroll to Network then press ENT.
4. Scroll down to NMEA 0183 over junction box then press ENT.
A list of port numbers will be shown. The MX610JB has 4 ports
while the MX612JB has 12 ports.
5. Scroll to the port you want to use (i.e. Port 1) then press ENT to bring up
the “Port# -Device configuration” dialog screen.
6. Scroll to the Output sentences button then press ENT to bring up the
NMEA 0183 Output Sentences dialog window.
7. Scroll to the GPS and press ENT to expand the list of NMEA messages
related to GPS positioning.
8. Scroll to the desired NMEA message (i.e. GGA, VTG, etc.)
9. Turn on the NMEA sentence by pressing the ENT key to put a check
mark on it.
10. Press the CLR key to go back to the dialog screen.
11. Highlight the CLOSE button then press ENT.
12. Press any hot key to exit.
¼ Notes:
• A limit of eight (8) NMEA sentences will be saved in the RAM memory of the MX610JB
junction box when power is turned off. The 9th and higher NMEA messages will be off the
next time the power to the junction box is turned on.
• When an MX smart antenna (i.e. MX521A or MX575D) is connected to Port 3 of the junction
box and selected as source of position, Port 3 will be grayed out from the list and will not be
accessible to the operator until it is de-selected as source of position data.
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