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".