[Elecraft] KAT500 serial cable

[Don Wilhelm]

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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