Application: PV750 monitoring a Standard J1939 Cummins QSB 6.7 engine in noisy enviroment. A buzzer needs to be connected towards all J1939 parameter warnings and shutdowns. How should I configure it through PV750 and PV450 configuration 2.2?

How can we make a 'pop up' acknowledgment against the buzzer warning, and set a unused button (button 2) to silence it?

I currently drive the IO.Output high whenever a new DM1 causes the alarm screen to popup. I use the same button for silence and acknowledge. I use a lamp gauge to have the button text say "silence" the if the IO.Output is high. I inserted a new state in the DM1 state machine between "Wait for Button" and "Acknowledge Current" that checks if the IO.Output is high. If it is, it is then sent low and the state returns to "Wait for Button". If IO.Output is not high, then it continues on to "Acknowledge Current" as normal.

Hello Danny,

The Murphy PVA gauges (http://www.fwmurphy.com/pva/) are compatible with the PV750. One of those gauges is the audible alarm (PVAA20). That would be the easiest way to add a buzzer to the PV750.

An alternative would be to use the digital output to control a buzzer manually. You can make a state machine to turn he output on and show the button to silence it when a new fault is available.

Regards,

ksaenz

Thanks for your information.

In this application, I prefer the Digital Output. I have found the schematic for the OD, but could not find how to program it by PV750 2.2 software. Could you supply an example of the programming to both active and silence the OD buzzer, please?

Hello Danny,

To turn the output on and off you just to execute the actions "IO->Output High()" and "IO->Output Low()" from a state in a state machine.

Regards,

ksaenz

I would like to use the PVAA20 with my PV750 for audible alarm notification. However, I need to create different tones for different alarms. I have been told that this has already been done by the folks at Murphy, but would like to know if someone can send me an example so I can see how it is done, or at the minimum, a detailed explanation on how to do it. I can see how it can be done with using the Output on the PV750, and using state machines, but I want to know if it can be done with the PVAA20. Thank you.

I'm using Build 2.3.11147 (10/10/2011).

Hi jbilleter,

The PVAA20 is controlled by Murphy displays over the RS485 bus. There is no manual control of the PVAA20. When a display detects a DM1 fault on the CAN bus, it sends a message to the PVAA20 to place it in an alarm state. The buzzer on the PVAA20 will either sound with a solid tone (for Stop or Protect lamp status) or will sound on and off (for MIL and Warning lamp status). The PVAA20 does have a relay output to drive additional external alarms in conjunction with the PVAA20, but the alarm status is controlled by the Murphy display that the PVAA20 is connected to.

To implement a custom tone for an alarm, you will probably have to use a generic buzzer with the digital output as you discussed with ksaenz. The digital output on the PV750 is open-drain, so it will be grounded when it is active. If you connect the buzzer's ground pin to the PV750's digital output pin, and power the buzzer accordingly, you should be able to create a tone with any kind of rhythm that you need using a state machine (with the actions described by ksaenz) and timers.

Thanks for the question! Let me know if you require additional assistance.