48 DA Owners Club

[Shaps]

You should see the green LEDs while the generator is running. Here's how to read them (didn't come through the last time):
View attachment 102937

Also, FWIW, I left Jumper 5 alone when I set mine up. Why did you repair it?

I followed @Aml327 and @ocgrant

 

[Shaps]

What is the source address?
View attachment 102936

I'll try to get down to the boat tomorrow evening and post what we are seeing on the usb100

 

[Shaps]

Where are the LEDs on the NIM?

 

[ocgrant]

Where are the LEDs on the NIM?

Good question I don't remember but I think I remember seeing them when I had it all apart and running... Cut W5 and see what happens.

 

[ttmott]

We tried to manually put in 234. But no data was being transmitted.

First check the total resistance of the Maretron cable This will determine if W5 needs to be connected or not and if a resistor needs to be added at the J2K100 end of the cable. Once you have verified the cable is correct and has the correct resistance then -
With the generator running, on the Maretron screen execute "refresh J1939 Source address list". If 234 is returned then the NIM is communicating using source 234; use that. If another is returned use the other. If none are being returned then there is an issue with the cable, the NIM, and/or the generator's data functions.

 

[ttmott]

Troubleshooting LEDs -
1. The NIM must be awake to communicate. To wake up the NIM, press the start switch on the generator set. The NIM will always be awake when the generator set is running. If there is no communication activity, it will turn itself off in 5 to 10 minutes after the generator set stops.
2 LED indicator light DS2 blinks very fast when communication with the generator set. If it dows not, check that the Y-harness is connected to the 8-pin connector J10 on the NIM and generator set remote connector J4 inside the control junction box.
3. LED indicator light DS4 blinks approximately once a second when communicating with the network. If it does not, check that the network harness is connected to 12-pin connector J11 on the NIM. If it still does not communicate, troubleshoot the network harness.
4. LED indicator lights DS1 and DS3 are not used.
Troubleshooting Network -
1. Make sure the NIM has been configured properly with its jumpers.
2. Disconnect the network harness at 12-pin connector J11 on the NIM and measure resistance across pins 4 and 5 in the mating network harness connector. The resistance should be 60 ohms, indicating that there is a terminating resistor at each end of the network and that the wiring is intact.
3. Make sure that CAN HI (or CAN+) matches CAN Hi on the J2K100.

Jumper source address configurations -
W3-Not Cut and W4-Not cut = Address 234
W3-Not Cut and W4-Cut = Address 158
W3-Cut and W4-Not Cut = Address 179
W3-Cut and W4Cut = Address 203

 

[ocgrant]

I am thinking you got a bad cable personally.

 

[Shaps]

I am thinking you got a bad cable personally.

Tested continuity w the maretron guys. He said it was good. Pin outs matched too

 

[Shaps]

First check the total resistance of the Maretron cable This will determine if W5 needs to be connected or not and if a resistor needs to be added at the J2K100 end of the cable. Once you have verified the cable is correct and has the correct resistance then -
With the generator running, on the Maretron screen execute "refresh J1939 Source address list". If 234 is returned then the NIM is communicating using source 234; use that. If another is returned use the other. If none are being returned then there is an issue with the cable, the NIM, and/or the generator's data functions.

Tom, just confirming,
to check the resistance of the maretron cable, i checking pin4 to ground and pin5 to ground ?

With the gen running maretron kept refreshing the list of j1939 sources and never saw anything but "none"
They also had me add a T and resistor (temporarily) on the j1939 side

 

[ttmott]

Tom, just confirming,
to check the resistance of the maretron cable, i checking pin4 to ground and pin5 to ground ?

With the gen running maretron kept refreshing the list of j1939 sources and never saw anything but "none"
They also had me add a T and resistor (temporarily) on the j1939 side
View attachment 102952

No not to ground. Completely disconnect the Maretron cable from both the NIM and J2K100 and measure the resistance between pins 4 and 5 (CAN Hi and CAN Lo) of the cable end that connects to the J2K100. It could be open circuit or 60 ohms or 120 ohms.
Open circuit means there are no resistors installed as part of the cable build and consequently there needs to be a 120 ohm resistor installed at each end.
120 ohms measured means there is a resistor installed at one of the ends of the cable and consequently another needs to be added to the other end.
60 ohms means there is a 120 ohm resistor installed at both ends and nothing further needs to be done.
So do this first.
Now, that W5 jumper on the NIM - if that is intact (not cut) then the NIM provides the 120 ohm resistive load for that end of the cable. Sea Ray cut W5 and had a Smartcraft resistor (yellow cap) integrated with their cable and located inside of the generator's electrical housing. I'm not sure what Maretron has integrated with their cable so W5 may need to be cut or not depending upon what the above testing determines.
Then, at the Maretron J2K100 a tee and resistor may be required as shown in your picture or not; again depending upon what the testing determines.

The rule is there must be a 120 ohm load across CAN Hi and CAN Lo at each end of the data transmission backbone cable. With both resistors (loads) installed there should be 60 ohms measured.

Edited to delete NMEA 2000 vs J1939 comment

 

[Shaps]

No not to ground. Completely disconnect the Maretron cable from both the NIM and J2K100 and measure the resistance between pins 4 and 5 (CAN Hi and CAN Lo) of the cable end that connects to the J2K100. It could be open circuit or 60 ohms or 120 ohms.
Open circuit means there are no resistors installed as part of the cable build and consequently there needs to be a 120 ohm resistor installed at each end.
120 ohms measured means there is a resistor installed at one of the ends of the cable and consequently another needs to be added to the other end.
60 ohms means there is a 120 ohm resistor installed at both ends and nothing further needs to be done.
So do this first.
Now, that W5 jumper on the NIM - if that is intact (not cut) then the NIM provides the 120 ohm resistive load for that end of the cable. Sea Ray cut W5 and had a Smartcraft resistor (yellow cap) integrated with their cable and located inside of the generator's electrical housing. I'm not sure what Maretron has integrated with their cable so W5 may need to be cut or not depending upon what the above testing determines.
Then, at the Maretron J2K100 a tee and resistor may be required as shown in your picture or not; again depending upon what the testing determines.

The rule is there must be a 120 ohm load across CAN Hi and CAN Lo at each end of the data transmission backbone cable. With both resistors (loads) installed there should be 60 ohms measured.

Oh yea as an edit - you cannot interchange NMEA2000 components for J1939 - they connect but the pin outs are different. So, in the above picture that you have circled in red, if that tee with the resistor are NMEA 2000 the system will not work at all.

OK thanks very much Tom
Will hopefully check tomorrow night. I am pretty sure the maretron cable is open, no resistors. W5 is repaired.

The maretron guy is the one who told me to temporarily add a NMEA 2k Tee and terminator to the j1939 side.
*IF* I do indeed need a resistor on that side (the other side being the NIM) where/how do I install that?
Thanks again!

 

[Shaps]

Found a couple of snapshots of the n2kanalyzer

Note that we had hardcoded the 234 as j1939 source address and every time we refreshed we got the "none"

 

[ttmott]

The maretron guy is the one who told me to temporarily add a NMEA 2k Tee and terminator to the j1939 side.

I went back and looked at the Garmin J1939 pinout as well as the NMEA2000 and J2K100 for the Device-Net connectors - The Maretron Tech is correct and I'm wrong - Pins 4 and 5 are common on both device-net connectors for CAN Hi and CAN Lo so a NMEA 2000 tee and resistor is OK (I think) to use.
So, still disconnect the cable as I described and verify the resistance then install that Tee and resistor and do the same test again to make sure....
Anyhow once you get the cabling and resistors straightened out move on to checking the LED's on the NIM.
Back in a previous post re "instance" - Maretron is correct on setting the instance for the J2K100 to 2 or any other instance besides 0 or 1. Your boat's engines are 0 and 1; and there are common PGN data across all of the engines like oil pressure, coolant temperature, etc so each must have a separate instance otherwise you may be thinking you are looking at the Port engine Oil Pressure but what is being displayed is the generator's oil pressure. This BTW is different than the "source address" which is specific to the NIM and not the J2K100.
Here is the NIM / Onan Generator wiring diagram (lower left in this drawing) -

 

[Shaps]

Thanks @ttmott , really appreciate this.
WIll do and report back. I am still thinking i did not see any LEDs.... Odd.

 

[Shaps]

@ttmott
I reviewed with the Maretron tech what we tested yday:
1. We confirmed the cable itself is open (as it should be from Maretron). No Resistance
2. With W5 repaired, that should have put a 120 ohm resistor in place on the NIM j1939 side. We got no data into the j2k100.
3. We then added the Tee with the terminating resistor temporarily to see if that would complete the j1939 network as in the picture above. It did not help.

Again, I do not recall seeing any LEDs on the NIM. I will verify that when I get down there.

Thanks again Tom!
Shaps

 

[ocgrant]

@Shaps
Did you try unplugging everything from the NIM, power off gen battery and start over? Might just be a fluke and needs a hard reset.

 

[Shaps]

I had the board out and disconnected various times for sure. I will be more methodical when I am down there next. I'm leaning towards a bad NIM. (as annoying as it is, I bought a J1939 configured NIM that will be here by friday just in case).

Thanks Grant!

 

[ocgrant]

I had the board out and disconnected various times for sure. I will be more methodical when I am down there next. I'm leaning towards a bad NIM. (as annoying as it is, I bought a J1939 configured NIM that will be here by friday just in case).

Thanks Grant!

LOL... Thats what I always say bust out another boat buck and make that problem go away.

 

[Shaps]

LOL... Thats what I always say bust out another boat buck and make that problem go away.

exactly! ha

 

[Shaps]

Hi @ttmott
Just confirmed. I have no LEDs active on my NIM when the generator is running