On 22-Jul-99 Dave Lippincott wrote:
> I've already started to look into the same thing (except I decided to use
> the modem case). The only way I've figured out how to directly control the
> RS232 control lines is to not use the API. I found the necessary info
> somewhere online a few months ago, you might want to try looking a
> roadcoders.com (or whatever it is now) or at PalmCentral.
The big problem now is that the Palm's DTR line is not a real signal, it is
just the power pin on the tranceiver. So it goes to +6V when the tranceiver
is turned on and you can't get it to go low again without turning off the
transceiver.
So we really only have the RTS and TXD signals to work with. If you look at
the CM17A protocol you can see that you need two lines to power and control
the unit. It doesn't mention how much current or what voltage levels are
acceptable, so it may even work with lower levels.
http://www.x10.com/manuals/cm17a_proto.txt
/* Chris Faherty <[EMAIL PROTECTED]>, finger for PGP */
