Dear Sir,

I would like to confirm the following items. Please kindly get back to me.

<Background>
Two PV750's are mounted on a boat, one is on the deck, the other one is in the cabin. These two units are connected and one of these has PVAA alarm.

1. When some error is occurred, the PVAA is triggered. If an operator pushes "HIDE" button on PV750 which is connected with the PVAA directly, alarm stop. But, if he pushes "HIDE" button on the other PV750 which is not connected with the PVAA directly, alarm does not stop and keep alarming. I would like to stop alarm through both PV750's which are connected with PVAA directly or indirectly. How should I set for this?

2. Information on maintenance screen seem to be recorded on each PV750 individually, an operator needs to reset for each. How does the information link between the two PV750's?

3. Once alarm is triggered, it does not stop and re-sounds periodically until failure is fixed. I would like to stop re-sounding. How should I set for this?

Thank you and best regards,
Shiii

The easiest way to do the alarm feature you are discussing is to not use the PVAA at all. Use the digital out on the display to turn on a piezo electric alarm buzzer. The you can send a global silence command via CAN and use it to silence the buzzer. I have mine setup so there is a silence button when a new alarm comes up, and it has to be pressed before acknowledging the alarms (hiding). The buzzer remains off unless a new alarm is picked up.

Dear mbowdich,

Thank you for your attention and the information.

May I also hear from you about the question 2.?

Best regards,
Shiii

Dear mbowdich,

Thank you for your reply.

Could you send a sample configuration which shows how to use(set) degital output for a piezo electric alarm for reference?

Best regards,
Shiii

Dear Shiii-san,
I do not have your configuration to test on a PV750, but I believe Mr. M Bowdich is correct in using Free Form (FF) CAN messages.
Both PV750s should have the same configuration.
1. For alarms, use a State Machine to wait for when a DM1.IsActive event to occur, then transition to an [AlarmActive State] where you set the alarm (if it is local).
You can pick any 29-bit J1939 PGN which is not defined and make it your own proprietary message. Define the data format in the message to clear the alarm.
Have the user clear the alarm ( press a button, open some vents, dump ballast, etc.). Now send out your broadcast message to clear the alarm.
In the [AlarmActive State] wait for the broadcast message then clear the alarm (if locally attached). Transition to the [Initial State] and wait for the next DM1.IsActive message.

2. For Maintenance Data, I would make one the Maintenance Master based on its CAN Address (usually 242, 243, etc.) and select the lowest address. If you have multiple Displays on the same bus they must have a different CAN Address. Any time the maintenance data changes, the Maintenance Master could broadcast the new maintenance data with a multipacket message where all the data would be transmitted in a sequence of messages.

3. Alarms get retriggered when DM1 messages get transmitted again from things like Engine Control Units (ECUs). You either have to fix the problem to make the ECU quit sending messages or add logic in the Display to know that the DTC has been acknowledged and is being worked.

We have a team of engineers who build configuration and you may want to consult them for more details or check the Forum for more training presentations.

Dear Bowdich,

Thank you for your reply.
I tried to post my reply several times, but it could not be posted succuessfully.

Could you send a sample configuration to use the degital output for our reference?

Best regards,
Shiii