The KX3, KAT500 and the XG3 "serial" cables are the same at the
equipment end - whether they are USB or serial.
They are not entirely RS-232 complaint - the level for TXD is zero volts
to 5 volts, but RXD will accept the full RS-232 positive and negative
swings with no problem (hopefully I did not interchange RXD and TXD - if
so, just swap them). The TXD voltage range works well with modern
computers, but I cannot make specific statements about the Ardrino
interfacing.
73,
Don W3FPR
On 1/19/2014 5:12 PM, Jim Brown wrote:
On 1/19/2014 1:50 PM, Stan Gibbs, KR7C wrote:
The KX3 schematic shows the following:
RxD = tip
TxD = ring
GND = sleeve
My computers have serial ports, but the cable from Elecraft was USB. I
made myself a serial cable for my KAT500 from a hi-fi cable with a
3.5mm TRS plug on one end, split out to a pair of RCA plugs on the
other. I cut off the RCAs and soldered the cable to a DB9 connector.
Works fine. I got the pin-out from the KAT500 manual. I suspect it's
the same as for the KX3.
73, Jim K9YC
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