Interesting. Thanks! Dave
On Fri, May 27, 2022 at 7:53 PM David Woolley <for...@david-woolley.me.uk> wrote: > It's going to be similar to the application circuit in section 7.1 of > <https://ftdichip.com/wp-content/uploads/2020/08/DS_FT232R.pdf>, except > that not all the wires may be connected, and, in particular, any that > conflict with the K2's use of a pin on the connector for Auxbus won't be > connected. (The KIO2 documentation will tell you which pins are > actually used in a standard way.) > > It's just possible that they have left out the level convertors, as it > would probably work without them. > > Assuming it has the level convertors, the standard tool for looking at > what is happening will be something like this: > < > https://czh-labs.com/products/czh-labs-rs232-led-link-tester-module-db9-male-to-db9-female> > > (picked at random from a Google search. If it doesn't have level > convertors, the LEDs may only light up for one state, of the nominally > bipolar signal. (If auxbus is on one of the monitored pins, it might be > disrupted, but the resistor on the LED should ensure that there is no > permanent damage. It would be better to do it on the end of the > official KIO2 to RS232 cable, though. > > Incidentally the S in USB stands for serial, but it is different, and > much more complex, serial protocol. > > Also, I found the price eye watering, given what is probably in it; the > problem with very low production run products. Things like Arduino > throw in all but the level convertors and DB9 connectors, as just part > of something that sells for under GBP 10, although current Arduinos use > an AtMega microcontroller chip, rather than the FTDI chip. > > Before considering alternatives, do beware of the the vulnerable, > Auxbus, signal on the non-standard K2 connector. > > My PC motherboard was selected because it had a real RS232C asynchronous > port. > > -- > David Woolley > Owner K2 06123 > > On 27/05/2022 20:41, Dave Sublette wrote: > > It would be nice to have a schematic of the KUSB cable. > > > > If anyone has experience troubleshooting this sort of thing or knows > where > > to get more information, please let me know. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
