Raymarine NMEA BRIDGE Specifikace stáhnout pdf (Strana 11)

S e a T a l k < - > N M E A

S e a T a l k < - > R S 2 3 2

C o n v e r t e r

SeaTalk Output

The converter periodically checks if any new data has arrived from NMEA, that needs to

be sent to SeaTalk. New data is written to the SeaTalk bus only if the bus is not in use by

any other instrument. If the bus is in use, the converter waits for a while, and tries again.

Collision detection

With SeaTalk it can happen, that two instruments try to send data at the same time. This

may causes a data collision on the SeaTalk bus. In this case, the SeaTalk NMEA Bridge

immediately stops sending the current datagram.

To detect data collision, every single bit sent out to the SeaTalk bus is read back again

and checked for successful transmission. If the transmission was corrupted, this

transmission is stopped immediately. This single datagram will be discarded.

When the bus becomes free again, the transmission will be started again.

The lost datagram will be repeated on the next update from NMEA data.

At this time the following SeaTalk datagrams can be sent

00 Depth

10 app. Wind angle

11 app. Wind speed

25 Total & Trip mileage

27 Water temperature

30 Display illumination

50 Latitude

51 Longitude

52 Speed over ground

53 Course over ground

54 Time

56 Date

82 Target waypoint name

85 Navigation to waypoint Data

89 Compass ST40 heading

A2 Waypoint arrival Info

20 Speed through water

(see “Configuration settings” Item 14)

NMEA USB Input

SeaTalk Output

NMEA -> SeaTalk

translation

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 22 23

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Raymarine NMEA BRIDGE Specifikace Strana 11