Hi
Since upgrading to a new MPU1 Running 5.121, when ever i download all the sounders make a well horrid Scratching-scretching sound.. The Sounders are Pyronix twin alert and are wired too 12vf, spk- and Op1. Everything else is working fine.
It didn\'t happen before the upgrade so was just wondering if it was a new feature so you new when the download was finished!
Any Ideas?
Do you mean that they sound after the download is finished?
There is an automatic Reset after download, and for about 1 second, when the outputs are reset, the sounders may be activated. This serves as an automatic test as well
No, they are Screeching during the entire download!
I have not encountered this
Try connecting a resistor, eg 2.2K from the EOL resistors across the SRN- and SRN+ terminals.
I upgraded another system to the new firmware and had the same problem. I didn\'t have a chance to try the resitor.
It is the internal speakers making the sound not the Bell box so shouldn\'t the resistor be linked to SPK-?
Thanks
Yes try putting the resistor across SPK and 12V
That has fixed the problem! are there other people with the same problem or is it just me?
Just did another download and the noise came back. Have not touched the panel in between downloads.
I have not heard this problem before. Does it happen during a selective download ie shorter duration as well?
Try downloading a default template (ie blank) to see whether it could be due to something that you programmed. Download again after the default template is done
I\'ve just had this problem. Sounds like a ZX Spectrum loading a game !
I\'ve done three changes this morning (to a CBUS counter and a response) and on this third dump to comfort, the internal siren is screeching in tune with the download.