Heatmiser - quite impressed

Tim S · 2009-06-26T10:40:51+00:00

Not a question, just a wibble...Got one of these for testing (no affiliation etc etc): quite nice, reasonably sane interface (bar the low level config whichis weird).4 temp levels per day and 5/2 *or* 7 day modes. Remote probes, programmableoffsets, frost protection, holiday modes, and local temp overrides - itseems to have everything...There are versions with less features too.Anyway, couldn't resist, so I hooked it up to my linux box with an RS232-485converter and after a bit of buggering about, plus reading the protocoldocs: managed to remote command it (teccie people, see footnote).I like :)It's not radio, but that's not a problem for me...CheersTimFootnote:Here's a rougharsed bit of sample code to set the holiday mode to 3 days:#!/usr/bin/perluse strict;use warnings; use Digest::CRC qw(crcccitt);my @msg = (0x01, # target address 1-320x0c, # Frame len0x81, # Our address0x01, # 1= write, 0 = read0x18, # DCB index to access, hi0x00, # DCB index to access, lo0x02, # Data len to write, lo0x00, # Data len to write, lo3 * 24, # 3 days, in hours, lo part0x00, # high part); my $dat = '';foreach my $b (@msg){ $dat .= chr($b);}my $crc = crcccitt($dat);my $crclo = $crc & 0xff;my $crchi = $crc >> 8;# Slap a CCITT CRC on the endmy $packet = $dat . chr ($crclo) . chr ($crchi);print $packet;#################And fire it off with:perl | socat STDIN /dev/ttyS0,raw,echo=0,b4800#################Next I have to do a frame decoder. They seem to have missed a trick. Noobvious way to resynchronise after a broken/corrupted frame (other peoplemight use SLIP encoding or some other reliable way to demark frames).Probably have to do something like "no data for a second or more, then nextdata will be a new frame".

Jun 26, 2009 23 Replies

Rate this thread:

The Medway Handyman 17 years ago

I understood more of that than I did of the conversation between you & John :-)

Vote

Tim S 17 years ago

The Medway Handyman coughed up some electrons that declared:

Ah - a classics man. I'm more of a plilistine

Vote

John Rumm 17 years ago

And the correct form of address to a classics graduate?

"Big mac and chips please!" ;-)

Vote

Steve Firth 17 years ago

Usually it is "How would you like your tea, Permanent Secretary?"

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required