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Anyone know electronics of a Sonar Tducer?

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Anyone know electronics of a Sonar Tducer?

Old 10-15-2011, 08:00 AM
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Question Anyone know electronics of a Sonar Tducer?

hi all

im curious as to how a sonar transducer for a fishfinder sends and recieve signal to your device.


this is my transducer from my Lowrance Elite
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there are 6 pins on the connection that goes to back of your Lowrance unit
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im assuming:

O - 12v+
O - 12v-
O - Data+
O - Data-
O - Tempurature
O - ???
.....something alond those lines

i could be totally off with these as i am just assuming this with my basic comprehension of electronics.

any other thoughts on how the outputs might go?

Basically i am trying to create a software simulation that will emulate a transducer so i can build a program that works with and actual transducer. I know the programming part, i am just trying to understand more on how a transducer sends and recieves signals to the main unit so i can simulate it with software.

any further information anyone might have would have would be a big help also. Such as, how the data signals might work, ie, "Data+" sends a signal out of your transducer, into the water, the signals bounced back off the objects in the water will come back though Data-" at different timing.

Sorry if this is comfusing for some.... i knowwww there is boating/fisherman that has some kind of knowledge of this that they can help me out on.

anything helps

Thanks!
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Old 10-15-2011, 12:08 PM
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Interesting question. I'm going to keep watching this thread to learn more myself.

Dunno if it helps or not, but I had an older Humminbird 'ducer that started oozing tarry black stuff, so I took it apart. After cleaning it up a bit, all I found inside was what looked like a simple open-core wire-coil (kinda similar to that inside a speaker). I'd guess newer ones are more sophisticated and all, but there was no electronics (temp, +/- data, etc) that I could see.

HTH
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Old 10-15-2011, 12:25 PM
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Oh there's someone here who knows...

SemperFi? Where are you?
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Old 10-15-2011, 01:02 PM
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I can only tell you for an Airmar M260 transducer, 6 pin, the pin out is as follows:
1 - Unused
2 - unused
3 - XID + this is an identification circuit that gives info to the black box
4 - Depth reading positive
5 - Depth reading negative (tied internally to shield and XID negative
6 - outer shield, tied internally to ground (#5) above.
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Old 10-15-2011, 01:23 PM
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Originally Posted by SaltyG View Post
I can only tell you for an Airmar M260 transducer, 6 pin, the pin out is as follows:
1 - Unused
2 - unused
3 - XID + this is an identification circuit that gives info to the black box
4 - Depth reading positive
5 - Depth reading negative (tied internally to shield and XID negative
6 - outer shield, tied internally to ground (#5) above.

So the XID chip would be located on the actual transducer. And the head unit would interpret what information the XID is sending back? So whatever software I would like to develop would have to have drivers to understand the XID to work properly?

"Depth reading +/-" .....response from the depth reading would also be going through the XID?
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Old 10-15-2011, 01:47 PM
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You can check Airmar.com, they have many wiring diagrams posted on their website and they make most models, so you can probably find it. The depth reading would not be doing back through the XID, the depth goes back on lines 4 & 5. The XID sends an identification signal to the black box controller and tells it how much power it can handle...for example, is it a 600 watt, 1000watt, 2000 watt unit and probably the frequencies. So it sends a little information back and then the box knows how best to interface with the transducer. Only newer transducers have the XID chip built into them. Older ones dont.
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Old 10-15-2011, 03:07 PM
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Originally Posted by SaltyG View Post
You can check Airmar.com, they have many wiring diagrams posted on their website and they make most models, so you can probably find it. The depth reading would not be doing back through the XID, the depth goes back on lines 4 & 5. The XID sends an identification signal to the black box controller and tells it how much power it can handle...for example, is it a 600 watt, 1000watt, 2000 watt unit and probably the frequencies. So it sends a little information back and then the box knows how best to interface with the transducer. Only newer transducers have the XID chip built into them. Older ones dont.
Thanks Salty I was trying to find a manufacturer like this and had no luck. Kudos
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Old 10-15-2011, 07:53 PM
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The process of converting sound waves into electrical pulses and vice versa is called transduction...thus transducer.

The internal arrangement of the piezoceramic element (Crystal) with their positive and negative poles lying in the same direction is the key element.

Pulses of current from the echo sounder activate the crystal element. This is normally an AC current, and as the current changes direction the transducers elements will expand when a positive voltage is applied and contract when a negative voltage is applied.
This expansion and contraction changes the electrical pulses into sound waves.
This is the sound pulse that is sent out from the sonar system.

When a target echo from these sound waves returns to the transducer the pressure of the sound wave will act on the crystal element and produce a very small voltage as the element expands and contracts with each cycle of the return sound wave.

This very small voltage caused by the expansion and contraction of the element is sent back to the microprocessor of the receiver.

Now comes the good part.

The fisherman sees the return echo of the target on his sonar screen, becomes overly excited and promptly selects the wrong lure, sending it down to the incorrect depth thus completely missing the said target.
This is called fishing.

Last edited by semperfifishing; 10-15-2011 at 10:07 PM.
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Old 10-15-2011, 08:59 PM
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Originally Posted by kabona View Post
So the XID chip would be located on the actual transducer. And the head unit would interpret what information the XID is sending back? So whatever software I would like to develop would have to have drivers to understand the XID to work properly?

"Depth reading +/-" .....response from the depth reading would also be going through the XID?
Yes, the Xid chip is located in many Airmar transdcuers..not all.For example the Airmar P66 does not have the Xid feature.
And not all sonars have the capability to reading the XID chip.
As far as I know the Elite cannot do so.
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Old 10-15-2011, 11:53 PM
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Originally Posted by kabona View Post



im assuming:

O - 12v+
O - 12v-
O - Data+
O - Data-
O - Tempurature
O - ???
.....something alond those lines


The lowrance wiring normally is:

Pin
1 + depth
5 - depth
7 Shared ground for speed and temp & shield.
4 Thermistor..(Depth)
6 Shield for depth

If the unit has speed:.

2 + speed
3 - speed
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Old 02-16-2018, 06:42 PM
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Default XID protocol

DOEs anyone know where can I find the XID protocol?
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Old 02-17-2018, 04:43 AM
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https://www.google.com/url?sa=t&sour...9DTHN6IiRYXIfv
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