[Elecraft] K-Line system integration questions

[Lu Romero]

Hello All:

I now have the "complete" K-Line and Im wondering how others
here have hooked up their system.  Although I dont mind
researching and doing the integration myself, so as not to
reinvent the wheel and save time, how have others on this
reflector dealt with these issues?

Here is what I have:

- K3
- P3
- KPA500
- microHAM microKEYER 2 
- N1MM Logger/Logger 32
- 2x1 RS232 manual switch

I use a microHAM microKEYER2 for rig control and DVK.  I
have a manual RS232 switch that either delegates the MK2's
Serial output *OR* a direct feed from my computer's COM port
to the Elecraft system's input, currently the P3's serial
port.  When updating rig and panadaptor software, I always
use the direct feed from the computer serial port, and NOT
through the microKEYER. 

My question now becomes:  Where do I insert the KPA500 in
this chain of serial devices, or do I need to at all?  The
KPA500 manual specifically states that you cannot "Daisy
Chain" through the amplifier's serial ports.  I have always
been successful daisy chaining through the P3, so if I have
to chain them together for control, who is "first" in line
(nearest to the computer)?  Or do I now need a SEPARATE
serial port for the KPA500?

Also, I use N1MM Logger and Logger32.  These software
packages read and control the rig via the microKEYER 2's CAT
interface via USB and microHAM uRouter.  The cable for the
microKEYER2 has a plug that mates to the AUX port on the K3.
 This port on the K3 will now need to go to the KPA500 via
the KPAK3AUX cable. I use a MFJ 998 autotuner, therefore, I
will have to put the interruptor in line with this cable,
and will have to use the RCA PA Key cable as well, through
the MFJ998 and then to the KPA500 for amp PTT control during
tuning or High SWR events.  Do I now need a "Y" cable at the
K3's AUX port as well to handle the comms to the amplifier
and the microKEYER Aux port needs?  Can I assume that this Y
cable has to be a "straight thru" DB-15 cable with the pins
paralelled to the two outputs, or is there yet another
special cable that is needed to make all of this work
together?

Anybody have a similar configuration out there that works
well that can get me started down this integration process?

Thanks in advance!

Lu Romero - W4LT
K3/KRX3/P3/KPA500 and K1