Last time I checked, RT Systems cables use FTDI USB to Serial chips but they are programmed with non-standard USB VID:PID to make them "proprietary".  If you look at http://www.linux-usb.org/usb.ids and search for "RT Systems", you can see a short list of some known VID:PID combinations that Linux will then load the FTDI kernel module and treat the USB device as a serial port.  For unknown ports, I don't know if you can fake out Windows to recognize RT System cables as a standard serial cable but you CAN do this with Linux for ANY VID:VID using either some USB or UDEV tricks. 

I wrote the following up some time ago to either temporarily or permanently recognize the RT Cable and create a /dev/ft857_prog serial device instead of a generically named /dev/ttyUSB0 device:


Temporary USB recognition (this example does this for a Timewave Navigator device):
   https://www.trinityos.com/HAM/CentosDigitalModes/hampacketizing-centos.html#2c.kernelnavigatorudev


Permanent USB recognition across reboots (this example is for one of RT Systems cables for a Yaesu FT857):

   https://www.trinityos.com/HAM/CentosDigitalModes/hampacketizing-centos.html#1d.presetup-udevusbserial
   --
         #Device #3 - RT Systems CT-62B 1-port USB to serial adapter for FT817/857/897 (FTDI-based)
         #
         #NOTE: This adapter is NOT recognized by the Linux kernel as a valid
         #      serial device.  RT System does this ON PURPOSE so their programming
         #      software will only work with their cables!  You can change these IDs
         #      if you wish with http://www.ftdichip.com/Support/Utilities.htm#FT_Prog
         #
         #      Alternatively, the following will run a script to poke the RT Systems
         #      USB IDs into the kernel FTDI driver so it can recognize the new
         #      device as a serial port.
         #
         BUS=="usb", SYSFS{idVendor}=="2100", SYSFS{idProduct}=="9e56", ENV{ID_MM_DEVICE_IGNORE}="1", RUN+="/usr/local/sbin/RTSystems-addports.sh &"
         SUBSYSTEM=="tty", ATTRS{idVendor}=="2100", ATTRS{idProduct}=="9e56", SYMLINK+="ft857_prog"
   --

--David
KI6ZHD



On 08/22/2022 11:34 AM, Dave Matthews wrote:
Trying to avoid RT systems.  Not sure if they will work with CHIRP or if it is only for their software. 

Dave
W2IJL

On Mon, Aug 22, 2022 at 2:32 PM KE5EOT <ke5eot@gmail.com> wrote:
Gigaparts shows the RT Systems cable to be in stock.

https://www.gigaparts.com/usb-55-programming-and-data-cable.html?msclkid=ebfffb88e3301f63459a988b29a1dcfa
Randy (KE5EOT)
  ARRL, QCWA, ARES, RACES, ROWH
     http://ke5eot.webs.com
On 8/22/22 1:18 PM, Dave Matthews wrote:
Looking at picking up a ft-65 but the scu-35 cable looks to be out of stock with no eta.  Anyone using any of the Amazon clones successfully?  I will be using Ubuntu so most of the driver issues are not a problem.

Dave
W2IJL

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