The fan I have supports -33 open collector tachometer (through the yellow wire) and Option '-68' Locked Rotor Alarm (through green wire). Red is +V and black -V, a total of four wires.
It also supports ("-82," high-pass/low fail) , don’t know what that is.
As far as I know, -33 give a square wave per revolution through the yellow wire. I need to know its voltage with respect to ground and details of its working.
FAN INFO:
http://www.nidec.com/fanpdfs/ta450dc7.pdf
Pic:
http://cgi.ebay.com/12V-DC-Fan-Nidec...QQcmdZViewItem
Yeah it has an onboard flash memory of 8KB. Ok I am getting the idea.
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