Adding Mercury NMEA 2000 Gateway to 2004 Merc 525 EFI's
02-18-2016 | 12:43 AM
#14
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Joined: Jun 2010
Posts: 1,395
Likes: 930
From: LBC, OH
The Jbox is simply an "easy" connection hub for the Merc network cables. No matter what the setup, Merc, NMEA, ect, all CAN networks consists of two twisted wires, CAN-H & CAN-L, along with a 120ohm resistor between those wires at each end of the run. Your gateway requires a 12v power source, which I believe is provided from the NMEA network in this design.
I mistakenly thought Scagburner skipped the Jbox on his setup in the other thread. But after reading it again, he ended up using one. So sorry for that confusion. Easy plug-N-play includes the Merc cables and Jbox.
However "technically," you could skip the Jbox and connect directly to the CANbus pins on each ECU. Run those together then into the gateway with two resistors, and it will work just fine for a total investment of about $3.00. I use this setup daily for bench testing ECU's and gateways.
I mistakenly thought Scagburner skipped the Jbox on his setup in the other thread. But after reading it again, he ended up using one. So sorry for that confusion. Easy plug-N-play includes the Merc cables and Jbox.
However "technically," you could skip the Jbox and connect directly to the CANbus pins on each ECU. Run those together then into the gateway with two resistors, and it will work just fine for a total investment of about $3.00. I use this setup daily for bench testing ECU's and gateways.
02-23-2016 | 09:45 AM
#15
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Joined: Jan 2006
Posts: 549
Likes: 127
From: Lyons, Ohio
The Jbox is simply an "easy" connection hub for the Merc network cables. No matter what the setup, Merc, NMEA, ect, all CAN networks consists of two twisted wires, CAN-H & CAN-L, along with a 120ohm resistor between those wires at each end of the run. Your gateway requires a 12v power source, which I believe is provided from the NMEA network in this design.
I mistakenly thought Scagburner skipped the Jbox on his setup in the other thread. But after reading it again, he ended up using one. So sorry for that confusion. Easy plug-N-play includes the Merc cables and Jbox.
However "technically," you could skip the Jbox and connect directly to the CANbus pins on each ECU. Run those together then into the gateway with two resistors, and it will work just fine for a total investment of about $3.00. I use this setup daily for bench testing ECU's and gateways.
I mistakenly thought Scagburner skipped the Jbox on his setup in the other thread. But after reading it again, he ended up using one. So sorry for that confusion. Easy plug-N-play includes the Merc cables and Jbox.
However "technically," you could skip the Jbox and connect directly to the CANbus pins on each ECU. Run those together then into the gateway with two resistors, and it will work just fine for a total investment of about $3.00. I use this setup daily for bench testing ECU's and gateways.
02-23-2016 | 07:40 PM
#16
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Joined: Sep 2009
Posts: 534
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From: Clarence, NY
I have a 2004 Fountain 47 Lightning (triple 525 efi) without smartcraft, and am going to be upgrading my chartplotter. What I would like to do is also add the Mercury Gateway NMEA 2000 so I can also monitor engine function, fuel burn rate etc. From what I understand this should be possible with standard Mercury plug and play parts, but am having a hard time finding what parts I will need. If anyone has already done this to their pre 2006 boat, and can shed some light on this, I would greatly appreciate it. Looking for parts lists, numbers, etc.
Thanks,
JR
Thanks,
JR
02-29-2016 | 09:18 AM
#17
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Joined: Jun 2012
Posts: 126
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From: Arlington, TN
completed this on my 05 fountain with 2 525's in it and had everything hooked up and running in about 15 minutes this weekend. You do not have to have termination resistors on both ends of the 3 cables. All you need is the termination resistor on the jbox itself.
