[chirp_devel] DTR/RTS control

[Dean Gibson AE7Q]

On 2013-04-09 20:55, Dan Smith wrote:
> ... my MAX232-based custom interface cables ...
>
> What commercially-available cables require RTS low and DTR high?

MAX232-based cables are apparently regarded as the cream of the crop, 
which may be why you have not seen any problems.

As I noted, the Radio Shack 20-289 (the cable described in the link), 
which was sold widely for amateur and scanner usage. However, as I said 
(and the link noted), the circuit in that cable is problematic for other 
reasons, so I'm not so concerned about that one.

However, as I said, I have the RT Systems CT-29A, which was also *very 
widely* sold for a number of both Icom and Yaesu radios, before people 
started using USB.  I bought it years ago to work with the IC-7000.  
With some serial ports, it works fine with both DTR and RTS high.  
However, on the Digi serial port box I'm using (another widely sold 
product), the CT-29A requires RTS *high* and DTR *low*, probably due to 
serial port loading (why is why some cables work on some computers and 
not others).

If you don't want to do it, that's fine.  I use RumTrol for saving 
memories on the IC-7000, so I don't need Chirp to do it;  the only radio 
I use Chirp with, is the Yaesu FT-897D.  However, this isn't a pipe 
dream of mine;  both RumTrol and Ham Radio Deluxe have seen the need for 
quite some time, and it certainly wasn't me who prodded them;  my first 
exposure to both programs came with the feature already there, so there 
must have been some demand other than my crazy idea.  Further, the 
feature is not hidden;  it's there with the serial port selection.

You already have a menu list with "Enable Developer Functions";  you 
could always enable it there.  Or, you could create an additional item 
in that menu list titled "Advanced RS-232 Options".
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