Advice on installing a NASA EML3 log

[yerffoeg]

I have recently installed a NASA eml 3 clipper log. Version 3 has an interface box, like their previous versions, and I am having difficulty with the connections to this.

On the interface box there is a five terminal choc box for the five wires coming from the transducer – straightforward. Then there is a power supply socket for pos and neg – straightforward. Then there is a three terminal choc box connector labelled ground, low output, and high output. A NASA representative informed me that I need to connect the low output terminal to the display (NMEA data). I’ve done that but get a constant reading ‘0n’. I presume that the ground should also be joined up somewhere?!

The manual issued with eml 3 is that issued for eml 2, and does not address this.

Your advice please.

 

[ithet]

If you are connecting to a Clipper display you should be using the pre wired co-axial jumper, connected to the longer co-ax lead that plugs into the instrument. The jumper is pre-wired to ground and low.




I have just fitted an EML-3, but removed the co-ax jumper as I was connecting to a Raymarine ST60.

And here is the manual that covers both EML-2 and EML-3:
https://www.nasamarine.com/wp-content/uploads/2023/02/EML-2-3-Manual.pdf

 

[ithet]

I also noticed that you mention EML 3 and NMEA. The EML 3 has a pulse output, not NMEA, low level for Clipper instruments, and high for comparability with Airmar (i.e. Raymarine).

 

[yerffoeg]

Thanks for your reply.

I don't think I received a jumper with the kit. The manual doesn't mention the latest labelling for the 3 terminal choc box. So if I connect the 'ground' and 'low output' terminals to the display I should be OK?

 

[Llew]

I know I'm coming to thread a bit late but I installed an EML 3 over the winter hoping to feed it into my Raymarine system via an ITC 5 (which has exactly the same connectors as ST60 and turns the pulses into STNg). The NASA guys thought it should work but the display wont read other than 0.0knts. Has anybody managed this, my fall back would be to get an old ST60 and link back into my system from that but was hoping to avoid spending yet more of my meagre pension!

Llew

 

[ithet]

I know I'm coming to thread a bit late but I installed an EML 3 over the winter hoping to feed it into my Raymarine system via an ITC 5 (which has exactly the same connectors as ST60 and turns the pulses into STNg). The NASA guys thought it should work but the display wont read other than 0.0knts. Has anybody managed this, my fall back would be to get an old ST60 and link back into my system from that but was hoping to avoid spending yet more of my meagre pension!

Llew

Are you using the high level output from the EML-3? Have you connected a 12v supply direct to the EML-3?

 

[Llew]

Thanks for quick reply, yes to both parts of the question. The ITC5 recognises that somethings attached and it recognises the resistor across the temp connectors but cant get it to read anything other than 0knts. NASA tell me that the reading should be 5v P to P so will have another go at testing when back on board. I'm sure it should work!

 

[Llew]

Well after spending many hours trying to get this work and even the Raymarine tech guys thought it should, I got hold of an ST 60 display and on plugging the wires in it worked perfectly from the off. So it would appear that although the ST60 and ITC5 have the same wiring configuration there is something very different in the way they operate.

I hope this can save somebody else the wasted hours I've spent trying to get the ITC5 to work, because it doesn't.