I have been playing with a USB->tty interface device
(this is a USB 1.1 product from Sewell, based on the pl-2303, although
I dont think that the exact product is relevant).
I am using the USB implementation in Fedora2t1, kernel 2.6.1-1.65 .
I am sending some short (4char) signals to a X10 driver, an ON signal
and after a delay, an OFF signal.
Now EVERYTHING works as expected when I use a REAL serial port (ttyS1).
With the USB->tty port the OFF signal never gets sent, rather
the RTS drops as the program exits BEFORE the characters are sent to
the device. If I put in either a second write -or- a 5 second sleep
at the end of the program, then the 4char write at the end of the
program succeeds (as seen by watching a breakout box).
So, are there known timing problems with the USB->Serial driver?
Has anyone else reported similar problems?
Until I found that I could put in a 'sleep' (to keep RTS from falling
till after the characters were transmitted) this was going to be a
show stopper on using USB->tty devices.
--
Reg.Clemens
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