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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?
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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
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No, they are Screeching during the entire download!
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I have not encountered this
Try connecting a resistor, eg 2.2K from the EOL resistors across the SRN- and SRN+ terminals.
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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
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Yes try putting the resistor across SPK and 12V
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That has fixed the problem! are there other people with the same problem or is it just me?
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Just did another download and the noise came back. Have not touched the panel in between downloads.
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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
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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.
