Subject: From: Date:

RE: [ECS] RC-Series Communicating Thermostat Dan Hoehnen Tue, 9 Nov 1999 20:24:00 -0500

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The HAI RC series of stats uses RS-232, not RS-485, thus no converter is
required.  While RS-232 is not intended to support more than 1 device per
serial port, it is easy to design a modified hardware interface so that
multiple devices can share the same serial interface.  This is what the RC
stats do.  The Weeder kits by Terry Weeder also use this technique to allow
multiple devices to share the same serial port.

Dan

> -----Original Message-----
> From: bruce prager [mailto:bgprager@mindspring.com]
> Sent: Tuesday, November 09, 1999 6:36 PM
> To: ecs-list@netbloc.com
> Subject: Re: [ECS] RC-Series Communicating Thermostat
>
>
> Most "RS-232" thermostats are really RS-485 which is multi-drop
> RS-232,  Ie;
> multiple addressed RS232 interfaces.
> ----- Original Message -----
> From: Dave Kolb <davekolb@email.msn.com>
> To: <ecs-list@netbloc.com>
> Sent: Sunday, November 07, 1999 11:53 PM
> Subject: Re: [ECS] RC-Series Communicating Thermostat
>
>
> The HAI Omnistats can supposedly all be put on one RS232 line though that
> seems very non standard to me. I guess it works because each is coded as a
> unique device and only one will respond at a time. I have 6 total but have
> not hooked them up to the OmniPro yet. They can also go to a PC
> but may need
> an RS232 extender if over a 500' run I think.
>
> Dave
>
> -----Original Message-----
> From: Chris Armbruster <carmbruster@cyvolution.com>
> To: ecs-list@netbloc.com <ecs-list@netbloc.com>
> Date: Sunday, November 07, 1999 10:48 PM
> Subject: [ECS] RC-Series Communicating Thermostat
>
>
> >I am considering re-doing my zoned HVAC.  Currently, I have no
> thermostats.
> >Instead, I use temperature sensors, the analog inputs and relays on a
> >MicroREDAC and Enerzone inflatable dampers.  I would prefer a system that
> >has stand alone capability (in case the computer fails).  I am thinking
> >about RC-Series Communicating Thermostats (RC-80).  I have a couple of
> >questions about integrating the thermostats:
> >
> >1) Do I need a serial port for each thermostat or can I put all three on
> the
> >same port?
> >
> >2) Is there a way to set the swing temperature (this is the
> difference from
> >the setpoint that is necessary to turn the HVAC on or off)
> >
> >3) Do the RC-Series thermostats remeber their programs in the event of a
> >power failure or will I have to reprogram them?
> >
> >Regards,
> >Chris
> >
>
>
>
>
>

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