Subject: From: Date:

Re: [ECS] RC-80 Connections Bill Freeman/Austin/IBM Fri, 8 Sep 2000 09:57:13 -0500

---

 Fri, 8 Sep 2000 09:57:13 -0500
Brian:

The connections for HAI thermostat wiring are detailed in an Installation
manual that came with my units.  I have two RC-100's and, yes, multiple
'stats can be connected to a single RS-232 serial port (up to 128, I
think).   It all works because the communications protocol defined for the
'stats is unit number address specific and only the specific 'stat
addressed by a command will respond.   Each 'stat must be assigned a unique
unit number at setup time.   ECS supports this quite well.

If you don't have the installation manual, I could fax you the relevant
pages from mine on Monday.   I would also suspect that HAI could email you
a .pdf file that includes the information if you need it quicker than that.
Let me know if you need me to fax what I have.

Regards,

Bill Freeman
freemanb@us.ibm.com


"Brian McGinnis" <bd@brianmcginnis.com> on 09/07/2000 05:11:43 PM

Please respond to ecs-list@netbloc.com

To:   "ECS List Server" <ecs-list@netbloc.com>
cc:
Subject:  [ECS] RC-80 Connections




Hi all,

Can anyone tell me what the wiring configuration is to connect an HAI
RC-80 thermostat to ECS?

The owner's manual says to refer to the connection diagram provided by the
automation software, and the ECS manual says to refer to the manufacturer's
instructions.  It's a 4 pin connector with yellow, green, red, and black
wires on it.

I'm assuming it's RS-232 and want to hook it up to a DB-9 connector on the
PC.

Since I have 3 of them, do I have to dedicate a serial port to each  one?
The manual says they can be connected in parallel, but I didn't think  the
RS-232 spec supported this... perhaps it's RS-485?

Thanks,
Brian

---