Raymarine NMEA BRIDGE Specifications download pdf (Page 18)

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

B r i d g e

SeaTalk Output

The converter periodically checks if any new data has arrived from one of the NMEA- or

the USB port. Newly arrived data are converted to SeaTalk and written to the SeaTalk.

The bridge checks if the SeaTalk bus is free, or it is currently used by any other

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

Collision detection

Every single bit sent out to the SeaTalk bus is read back again and checked for successful

transmission. If the transmission was corrupted, the transmission is stopped immediately.

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

At this time the following SeaTalk data can be sent

00 Depth

10 Wind angle

11 Wind speed

20 Speed through water

25 Total & Trip mileage

27 Water temperature

30 Lamp intensity

50 Latitude

51 Longitude

52 Speed over ground

53 Course over ground

54 Time

56 Date

57 Number of sats, DD horiz. dilution of position

85 Navigation to waypoint info

82 Target waypoint name

89 Compass ST40 heading

9E Waypoint definition

A2 Arrival info

Same type of Data on NMEA & SeaTalk

Information available from like instruments on both buses ( SeaTalk & NMEA ) are not

converted.

Example:

We have a depth sounder on the SeaTalk bus and another depth sounder on the NMEA

bus. So, on both sides depth information is available.

In this case no depth information in transferred from one bus to the other.

( If depth information is not updated within 30 sec. on one bus, sending to the other bus is

activated again. )

SeaTalk NMEA Bridge 128SD Sw Version 3.01 Page 18 of 28

NMEA Input

SeaTalk Output

NMEA -> SeaTalk

translation

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Raymarine NMEA BRIDGE Specifications Page 18

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