Steve,
Are you using the KXUSB to connect with the KXPA100/KX3, or are you
using the KXSER with a real computer serial port or a USB to serial adapter?
Since your magloop controller only 'sniffs', it means it should only
listen and never try to transmit on the RS-232 signal lines. If it only
listens, there will be no collisons (RS-232 is not packet oriented, but
an asynchronous communications system).
If the magloop controller also transmits on the RS-232 bus, you will
need some external device to act as "traffic cop" - note that RS-232 is
a point to point system (unlike Ethernet and others) where there is one
driver device and one receiver at each end.
So yes, you can use a splitter - one with a 3.5mm stereo plug and two
3.5mm stereo jacks if using the KXUSB.
If you are using the KXSER cable instead, yes, you can connect a "Y" DB9
splitter to the DB9 end of the KXSER cable - the computer connects to
one side and the magloop controller connects to the other side of the "Y".
On 7/8/2018 3:31 PM, Stephen Rector via Elecraft wrote:
Hy home station is a KX3 + KPXA100, and I can control the radio via the RS232
port on the KXPA. However, recently I added a Ciro Mazzoni magloop to the
station, and its controller plugs in to the KXPA serial port to sniff for
frequency information, allowing re-tuning on the fly. This leaves no RS232 port
left for remote control of the radio.
How do I modify this arrangement to add an extra serial port for KX3 control?
My first thought is that, since the antenna controller just sniffs for data, I
could add a DB-9 Y-cable to provide the extra port at the controller serial
port location. However, packets could still collide ...does the protocol handle
this? Is there some sort of multiplexer available?
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