I have found that the PV750 is sending both global and address specific requests for all of my requested PGNs. This is resulting in multiple replies from the same node (address specific and global) for each request, which is clogging up the bus and delaying other important messages when multipacket message requests are involved.

My solution has been to not mark request PGNs in the database, and use FFCAN message to send the requests

If the node responds to global requests you can uncheck the box "Request Specific Address" in the Device Setup. This should stop the address specific requests.

Regards,

ksaenz

The question still remains; Why do both requests get sent? It should be one or the other depending on the check box.

There is a way to disable globals on the J1939 port manager application using the check box "Send Global ISO Requests". This turns off the global requests of all the devices.

Essentially if you have multiple devices you can toggle on/off Specific Address for each device or toggle on/off Global Addresses for all devices. You cannot turn global addresses off for individual devices. This is by design so if you required different operation it would really be a feature request and not a bug.

I hope this helps.

You can find the "Send Global ISO Requests" under the Instance Information section of the J1939 Port Manager Application on the Environment Setup tab.

Let me know if this solves your problem.