Re: X10 programming from PC

[bonomi@xxxxxxxxxxxxxxxxxxxx (Robert Bonomi)]

In article <9eANg.27133$DB3.23003@xxxxxxxxxxxxxxxxxxxx>,
Geordie <bill-gibson_remove_@xxxxxxxxxxxxx> 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.

The first possibility that comes to mind is that the CM12 might be DTE,
not DCE, and your cabling is wrong.
>

Try adding a null-modem.