[time-nuts] Lady Heather

ws at Yahoo warrensjmail-one at yahoo.com
Sat Jul 14 02:53:33 UTC 2012


Yes, RTS is the other pin. 
>From 'Heather.txt'  {Helper} file

Added ability to actively stabilize the device temperature. 
(/TT=degrees or TT command line option).
Uses the serial port RTS and DTR lines.  
RTS is the temperature controller enable (+12=off, -12=on)
DTR is the heat (-12V) / cool (+12V) line. 

ws

******************************

>So the other signal is on pin 7, RTS?
>Don

*****************
ws at Yahoo
> Don
>
> No, it is not bang-bang. Look at the plot results.
> You don't get .001 deg type resolution and control with a bang-bang
> controller.
>
> It is a full Linear, universal,  PID + with self tuning capability.
> The output is a high resolution Linear PWM driving one of the RS232 pins
> and a polarity/enable
> output on one of the other pins which can be used for heating / cooling
> / enable / fail_ save, etc.
> ( I don't use the second output with the KISS simple fan driver, because
> that hardware is already fail-safe).
>
> The PID can be manually set for all kinds of things, Including Band-Bang
> control.
>
> ws
>
>
> ****************
>
> Thanks, Warren, for the refresh. So the L.H. fan control signal is
> bang-bang, and not really a PID, as it's on the DTR data line.
> Don
>
> ws at Yahoo
>> Don
>>
>> no internal connection needed.
>> Lots of ways to do it,
>> an isolated optical isolator connect to a couple of pins on the RS232
>> connector is one way.
>>
>> The LH controller can also be used to just Heat for those that don't
>> like moving parts, or dual with heat and cool as well as just drive a fan.
>> If ypu want you could go full nuts and connect it up to control the
>> room AC/Heater
>>
>> For the LH driver I use and how I use it see:
>> <http://www.febo.com/pipermail/time-nuts/attachments/20110116/76cc81b5/attachment-0001.jpg>
>>
>> text at:
>> <http://www.febo.com/pipermail/time-nuts/2011-January/053648.html>
>>
>> ws
>>
>> *******************


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