SERVER
To double the transmission speed, select a NMEA sentence 2 times with 7 slots apart, that is the slots should be as far away from each other as possible.
In a similar way, you can select the a sentence 4 times to make it 4 times faster.
Example: If you want to transmit the Nexus compass heading via NMEA, to for example an autopilot, select (HDM) for every odd slot number, C79, C81, C83 ...
C93, that is 8 times which makes the speed 4 times / second. This leaves the other 8 slots with even numbers, C78, C80, C82 ... C92 free to use for other NMEA sentences.
For connection of NMEA instruments OUT from Server, (see 2.8).
2.10.3Receive NMEA sentences IN to Server There are 5 different main types of NMEA sentences:
1)Position related data: Position, SOG/COG, time, and a limited amount of satellite status if a GPS is connected. The information is read if no other Nexus GPS is connected.
2)Navigation data: (BTW), (DTW), (BOD), (XTE), (SET) and (DRIFT). This information is read only if C75 NAV is set to (ON).
The Server will automatically send data to the Nexus Network. E.g.: (DRIFT), (WCV), (TTG) and (CTS).
3)Compass heading is read only if (C76 CMP) is set to (ON). Heading is either (HDT) (priority) or (HDM). Magnetic variation (from Nexus Network) is added to (HDM) but not to (HDT).
4)Relative wind angle and wind speed is read from (VWR) data, only if (C77 WND) is set to (ON). True wind angle and wind speed is calculated by Nexus, when the boat speed (the speed of the water) is known.
The following NMEA sentences can be received IN to Server:
APA | Autopilot sentence ”A” |
APB | Autopilot sentence ”B” |
BOD | Bearing original destination |
BWC | Bearing and distance to waypoint |
BWR | Bearing and distance to waypoint (old) |
DBT | Depth measured from the transducers position |
DPT | Depth |
GGA | Global position fix data (GPS) |
GLL | Geographic position, Latitude/Longitude |
GSA | DOP and active satellites |
GSV | Satellites in view |
HDM | Heading, magnetic |
HDT | Heading, true |
RMB | Minimum navigation information |
RMC | Minimum specific GPS/transit data |
RTE | Not yet implemented |
WCV | Waypoint closure velocity |
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