DECUServe VMS Conference 3064


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Note 3064.0            X10 / X-10 / BSR / Home Automation             15 replies
EISNER::COVERT "John.Covert@Compaq.com"              29 lines  21-DEC-1999 10:54
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What good is the DECUS VMS hobbyist license unless we can do fun hacks
for our home with our VMS systems?

I recently bought the $6.20 (including tax and shipping) X-10 starter kit
from www.x10.com, which includes a handheld remote, a lamp module, an
appliance module (doubles as receiver for the remote), and this little
thing called a FireCracker -- no bigger than a DB-9 connector.

The protocol spec for the FireCracker says you talk to it by toggling
DTR and RTS, making sure that at least one of them is always high, and
bringing them both up between each bit transmitted:

          Standby | '1' | Wait | '0' | Wait | '1' | Wait...
          _____________________       _____________________
RTS     _|                     |_____|
          ________       ___________________       ________
DTR     _|        |_____|                   |_____|

The recommended time for the '1', '0' and 'Wait' states is at
least 0.5ms.

I wrote a little bit of BLISS and DCL to run the gadget, and thought I'd
share it with you in the next two replies.

I have the smarter controller, the CM11, on order.  It uses a serial
protocol on the actual data lines running at 4800 bps.  I'll let you
know more about that once I have it working.

/john

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