I posted a couple of weeks back and got no response at all,
so forgive me, but I'm trying again.
I need to hook a serial modem (pots) up to the robostix on
the STUART port. I have a console up and going on the FFUART
port and don't want to use a tweener board.
If I turn off all flow control, etc. on the port, is it possible
to use a dial-up modem with just TX/RX/G/5v TTL via the STUART
port? If so, what am I missing?
I keep thinking that I should be able to do this without the
modem control lines, etc..somehow.
If this isn't possible, is there a way to route modem control
signals through some of the GPIO's on the robostix or some other
method I could use that would be sensible?
I have read about folks using the tweener with a modem and I don't
see that it really has more signals than the STUART. Just that
it's raised to RS/232. This modem will work with RS/232 or TTL at
Also, I notice when I put a meter on the STUART that instead of
3.3v TTL I am seeing 5v on the Vcc pin?? I'm confused as I thought
it was supposed to be at 3.3v. :-)
(original post here: