On Sat, 19 May 2018 13:39:39 +0000 (UTC), Martin Gregorie
 declaimed the following:


>
>The KRT2 manuals don't say what signal levels are expected on the serial
>port. The radio runs off 9-28v (mine is on a 12v SLA) but the manuals say
>nothing about serial port levels. It is (used for both presets up/down
>load and to connect to an optional remote control head). The manuals I
>have include one for the presets up/download connection, but that expects
>the PC to have an RS-232 serial port and, again, doesn't mention the
>expected signal level.
>

 If it specifies /RS-232/ (rather than generic UART) it likely needs the
formal hardware specifications...
https://en.wikipedia.org/wiki/RS-232#Voltage_levels

and
http://www.postfrontal.com/forum/topic.asp?whichpage=2.53333333333333&TOPIC_ID=
7792𐻣
has a post linking to an RS-233  TTL level converters on eBay.



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