Hello all. I apologize for a stupid newbie question in advance!
I am evaluating the use of the Gumstix products for use in a project for
my company. The gumstix look really great, but I am confused by the
large array of options.
What I want is a Gumstix (connex 200xm) with wired ethernet and MMC
(netMMC) and one or more RS232 serial ports (that require no external
circuitry -- so they can be hooked up directly to other RS232 devices
(fire panels, security panels, etc...)) and individual I/O lines (that
can be used to monitor inputs such as door contacts, motion detectors,
etc.. or for outputs such as relays and whatnot). I understand that for
the individual I/O, external circuitry will be required (resistors,
diodes, transistors, relays, power, etc...).
Where I am confused is the third board that I need. I was originally
looking at the breakout-gs, but then it looks like I'd need external
circuitry for the RS232 serial ports. So now I'm thinking the
waysmall-stuart. It looks like it has two RS232 serial ports onboard.
The SPEX thing says it has "I/O" pads. But looking at the picture of
the circuit board, I don't see anywhere for I/O lines. The breakout-gs
looks like it has holes for 16 GPIO lines. But in the docs, these are
referred to as "LCD". I don't want to use an LCD, I want a bunch of I/O
lines that I can set up individually to be used as either inputs (dry)
or outputs to control relays. But at the same time, I'd like one or
more "real" serial ports (real meaning the circuitry is already on-board
and all I need is the cable).
Again, I apologize for my confusion. There is a wealth of knowledge in
the Wiki, but after reading through some of it, I am sill confused, and
hence, am turning to the mailing list for help :).
Any help would be GREATLY appreciated!!!