[Arm-netbook] rs232 level shifters

[mike.valk at gmail.com]

2013/11/19 luke.leighton <luke.leighton at gmail.com>

> On Tue, Nov 19, 2013 at 12:50 PM, mike.valk at gmail.com
> <mike.valk at gmail.com> wrote:
> > 2013/11/16 luke.leighton <luke.leighton at gmail.com>
> >
> >> On Sat, Nov 16, 2013 at 8:22 PM, Henrik Nordström
> >> <henrik at henriknordstrom.net> wrote:
> >> > lör 2013-11-16 klockan 13:23 +0000 skrev luke.leighton:
> >> >> https://www.sparkfun.com/tutorials/215
> >> >>
> >> >> in the end i went with this for the router, using an IMD2A for the
> two
> >> >> transistors.
> >> >
> >> > Personally I haven't used RS232 in ages, only different "TTL" serial
> >> > variants of 5V or 3.3V.
> >>
> >>  yehh i have to be reaasonably compatible with RS232, as this is
> >> actually going to have a 9-pin header on it.  although the only thing
> >> it will be connected to in most cases is one of those... yup, USB
> >> serial converters.
> >
> >
> > Why don't we include a USB to TTL-Serial chip on the card and/or carrier.
>
>  USB-to-TTL.... ah, because that would take out one of the 4 USB
> ports.  in this "product" there's only 1 4-port hub.
>

No, not on the hub. As as separate usb "slave" port.

USB Host Port-1 -\
USB Host Port-2 -\
                  |----HUB----[USB-Host SoC UART]--[TTL-USB Slave (USB
Serial debug)]--[USB Slave]---[USB-Host/OTG]--[PC,Tablet,etc.]
USB Host Port-3 -/
USB Host Port-4 -/


>
> l.
>
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