View source for MotoTune:FAQ:How do I resolve identifier conflicts and use MotoHawk and/or MotoTune in a J1939 network?

When MotoTune is to be used in a J1939 CAN communication scheme, conflicts can arise. Since  MotoTune and J1939 specs arose in different industries, they have their own, predefined CAN identifiers.  Using these identifiers can cause conflicts and hamper successful use of MotoTune and MotoHawk within a J1939 network. Fortunately, the conflicts can be resolved, as described in the following sections. 

=== The Identifier Conflict ===

SAE J1939 provides a list of reserved CAN addresses. Within a J1939 network these addresses should not be used by any device that is not performing the function outlined by the specification.  As examples, the engine is 0x00, and an after treatment device is 0x3D.

It happens that using the MotoTune default city ID of 0x02 results in CAN identifiers that conflict with the SAE J1939 reserved address for a turbocharger controller. Also the MotoTron default controller identifier, PCM-1, uses a city ID of 0x0B, which conflicts with the SAE J1939 reserved addresses for a Brake System Controller.
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=== The Conflict Resolution ===

The resolution is to remap the MotoTron protocols to a J1939-compatible ID pair.  To do this,  modify both the PC software, and the module-contained software. The two types of modifications necessary -- in Model-based (MotoHawk) software, and in the PC-based (MotoTune/MotoServer) software -- are described in separate sections below. Those using only the PC-based Tools would require only the PC ([[#MotoTune.2FMotoServer_Settings|MotoTune/MotoServer]]) section.  

==== MotoHawk Model Configuration ====

The first task is to make the application running on the module capable of engaging in MotoTune traffic, on any CAN ID pair.  This can be accomplished by using the MotoTune Handler block (available under [http://www.mototron.com/user/downloadOptional.php Optional Downloads ], Library CAN protocols), instead of using the default handler provided by the [[MotoHawk:Blocks:CAN_Definition_Block|CAN Definition]] or newer ''MotoTune Protocol Definition'' block:  

#In the MotoHawk model, disable the MotoTune protocol by removing the ''MotoTune Protocol Definition'' block, or if using the CAN Legacy implementation, disabling MotoTune protocol in the ''CAN Definition'' block parameters <BR>

(a)<BR>
[[Image:CANNewBlocks.png]]<BR><BR>
(b)<BR>
[[Image:J1939FAQ1.png]]<BR><BR>

#Add a “MotoTune Custom CAN Protocol” block to your model.<BR>[[Image:J1939FAQ2.png]]<BR><BR>
#Set the CAN IDs in this block in the form:<BR><BR>  RxID: 0x1800mmTT<BR>  TxID: 0x1800TTmm<BR><BR>--where mm is the source address assigned to the module, and TT is the source address assigned to the PC tool.  For example, for an exhaust aftertreatment system, mm = 0x3D (61 decimal) and TT = 0xF9 (249 decimal).<BR><BR>
#Build the MotoHawk model with this block and settings and program the module. The module is now capable of communicating via a J1939-compatible ID pair.<BR><BR>

==== MotoTune/MotoServer Settings ====

With the module enabled for the new CAN IDs, next set up MotoTune/MotoServer accordingly.  To set a custom CAN ID for MotoServer:

#Right-click on the "satellite dish" icon in the lower-right corner of the computer screen<BR>[[Image:J1939FAQ3.png]]<BR><BR> 
# Select '''Ports...''' 
# Select '''Edit Names'''.  
# Select '''Add'''.
# In the '''Create New Port Mapping''' dialog, select '''CAN Custom''' and then click '''Next'''.<BR>[[Image:Tune00.png]]<BR><BR>
# Enter an appropriate port name and enter the IDs (in decimal) corresponding to the module IDs.<BR> ----------------------- Hex -------- Decimal ---<BR>TxID to Module 18003DF9     402669049<br>RxID to Module 1800F93D     402716989<br>[[Image:J1939FAQ4.png]]<BR><BR>
# Click on '''Finish''', then at the prompts, '''OK''', and '''Add'''.
# On the '''Port Properties''' dialog, select '''Kvaser CAN''' for '''Type''', then for '''Location,''' select the port name that you just created.  Also make sure to set appropriate '''Access Level''' and '''Baud Rate'''. Click on '''OK'''.<BR>[[Image:J1939FAQ5.png]]<BR><BR>

The new port is now enabled for MotoTune. Your port is now listed by name and checked on the Port Configuration dialog. <BR>[[Image:J1939FAQ6.png]]<BR><BR>

If this process is set up correctly, you will see indications that MotoTune communicates to the module via the J1939: <BR>[[Image:J1939FAQ7.png]]<BR>
<BR>[[Image:J1939FAQ8.png]]<BR><BR>


[[http://mcs.woodward.com/support/wiki/index.php?title=MotoTune:FAQ:How_do_I_resolve_identifier_conflicts_and_use_MotoHawk_and/or_MotoTune_in_a_J1939_network%3F&oldid=3149|J1939]]