Re: X10 programming from PC

[Charles Sullivan <cwsulliv@xxxxxxxxxxxx>]

On Tue, 12 Sep 2006 15:19:33 +0000, Geordie wrote:

> Hi,
>
> I'm trying to control an X10 system through a CM12U (similar to CM11) via
> the serial port, using my own software.
>
> I know the software is correctly talking to the serial port (because I tried
> it with a modem), but I'm having difficulty communicating with the CM12.
> What I'm sending is 0x04 (Header) then 0x5E (to address unit G2) but I can't
> get a Checksum back from the CM12.
>
> Any thoughts?  One thing I noticed in the "Interface Communication Protocol"
> document at the end of section 3.1 is "This format is typical of all
> transmissions between the PC and the interface with the difference being in
> the first transmission from the PC." - but I couldn't find anything about
> __what__ is different about the first transmission.
>
> TIA,
> Geordie

Are you sending the two bytes in one transmission?  Sending separately
usually doesn't work.

Try sending the single byte 0xEB and you should get the same byte echoed
back.