So I whip out a FTDI-based multiport Serial USB Adapter.... [SB QUAR: Tue Feb 5 10:15:47 2013]

[CeDeROM]

On Tue, Feb 5, 2013 at 6:09 PM, Karl Denninger <karl at denninger.net> wrote:
> The FTDI adapter has the provision for an external power supply (+5V)
> but it does not require it unless you're running off an unpowered bus,
> which is not normally the case.  500ma is quite a bit of available energy.

Karl, can you please use external power supply to power up the adapter
- with and without the additional devices step by step - this way we
will eliminate one of the possible causes :-)

-- 
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info