External buzzer installation

[northcaptain]

I'd like to install an external buzzer on the MFD12 and the documentation says pin 15 on the data 2. There is another pin 12 with +12V for buzzer. I'm puzzled, i have a small 200 mW 12 volt buzzer, where should i install it (which pins for positive and negative please) ?

:think

 

[Anonymous]

According the manual I think Pin 12 (Black/White) +ve and pin 11 (Black) -ve.

 

[Johnny Electron]

northcaptain
I am a bit concerned about the 200mA buzzer you have chosen. I think the buzzer needs to pull 120ma or lower. I will have to do some digging in my notes but I am worried your buzzer might not work as well or at all.

 

[Anonymous]

Johnny,
I thought that too until I realised he stated 200 milliwatts (not milliamps) That should be around 17 milliamps so well within the capabilities of the MDF.

 

[Johnny Electron]

Good eye... Thanks gdfisher
The wiring for the buzzer is also exactly as you stated (Pin 15 and Pin 12)

 

[dotdun]

A word of caution.

Obviously set:
Alarm-General-Alarm = Internal & External (or External only)

Also be sure to have:
Alarm-General-External Alarm Input = Off

I found that if the External Alarm Input is anything but OFF, every time the buzzer sounds, it'll initiate an External Alarm. Hence, every time the buzzer goes off, you'll get a new waypoint on the screen.

I surmised that my buzzer is low enough impedance when active to trip the External Alarm Input. The fix is as above, simply turn off the External Alarm Input.

 

[northcaptain]

Great information thanks !