weaver_fish
Well-Known Member
Looking at sorting out my electronics. Can I take the NMEA Out from a Log and from a seperate Wind Instrument and combine them together before connecting them to NMEA In on a plotter?
NMEA Cluelessness
- Thread starter weaver_fish
- Start date
muckypup
Well-Known Member
If your plotter only has one NMEA input then you will require an NMEA multiplexer.
Look at the NDC-3 here.. http://www.jgtech.com/Wireless.htm
(as usual, no connection!)
NMEA is basically a serial comms protocol which may take a few ms to transmit the sentence. In this time, another of your devices may try and transmit another sentence. If you didn't have some buffering in-between they could clash.
S.
Look at the NDC-3 here.. http://www.jgtech.com/Wireless.htm
(as usual, no connection!)
NMEA is basically a serial comms protocol which may take a few ms to transmit the sentence. In this time, another of your devices may try and transmit another sentence. If you didn't have some buffering in-between they could clash.
S.
tazzle
Well-Known Member
AFAIK you'd need to 'multiplex' the separate signals through a black box - not cheap. There are multiplexers about that can combine several NMEA inputs from wind, log, transducers, compass etc.
Edit:
oops! beat me to it.
Edit:
oops! beat me to it.
weaver_fish
Well-Known Member
Ah, shame... I am already going to have to fork out for a Raymarine Seatalk NMEA box thingy to connect up the other instruments! I was hoping I could avoid another box of tricks too.
tome
Well-Known Member
If your log and wind instruments are both Raymarine you can connect them together using Seatalk, then a single NMEA box will convert them both into a single NMEA output saving you a multiplexer
weaver_fish
Well-Known Member
Sadly not - the baot came with a range of equipment. Next question... does a feed into an instrument via NMEA In automatically get passed out through the NMEA Out of the same instrument?
johnb2
Member
The short answer is yes. This was the original intention of NMEA. Each instrument "adds" its own data to the stream.
Unfortunately this didn't encourage "brand loyalty" so different manufacturers developed their own proprietary and mutually incompatible systems.
JB
Unfortunately this didn't encourage "brand loyalty" so different manufacturers developed their own proprietary and mutually incompatible systems.
JB
glsg91
Active Member
[ QUOTE ]
Ah, shame... I am already going to have to fork out for a Raymarine Seatalk NMEA box thingy to connect up the other instruments! I was hoping I could avoid another box of tricks too.
[/ QUOTE ]
There are also multiplexer who also can have seatalk and nmea as input and nmea as output. Don't know if this solve your problem.
Example: http://brookhouseonline.com/
(no connections or used the product)
Ah, shame... I am already going to have to fork out for a Raymarine Seatalk NMEA box thingy to connect up the other instruments! I was hoping I could avoid another box of tricks too.
[/ QUOTE ]
There are also multiplexer who also can have seatalk and nmea as input and nmea as output. Don't know if this solve your problem.
Example: http://brookhouseonline.com/
(no connections or used the product)
weaver_fish
Well-Known Member
Ah brilliant. Thanks for that - had not seen that - one problem solved!
Next problem is to get a NMEA signal out of the Simrad IS12 Wind Instrument... which has not NMEA out! Simrad suggest buying a very expensive graphic display which will attach to Simnet and then give an NMEA out.... however, there is an adaptor available according to MES for £50 called an AT10, so I need to see if that can do the business.
Seems a bit bizarre to have a standard which the major manufacturers seem to go out of their way to avoid!
Next problem is to get a NMEA signal out of the Simrad IS12 Wind Instrument... which has not NMEA out! Simrad suggest buying a very expensive graphic display which will attach to Simnet and then give an NMEA out.... however, there is an adaptor available according to MES for £50 called an AT10, so I need to see if that can do the business.
Seems a bit bizarre to have a standard which the major manufacturers seem to go out of their way to avoid!