OK, I got a pl2303-based converter and setDTR is working with it, so it looks like a driver issue, not a pyserial one. I would welcome any suggestions of course. I opened a bug with SiLabs but I'm not very optimistic about getting an answer that way.
I have a SiLabs CP2102 serial to usb converter. I need to toggle the DTR pin.
I've installed the driver from SiLabs and the device shows up as "/dev/tty.SLAB_USBtoUART" and "/dev/cu.SLAB_USBtoUART". TX and RX pins work fine with pyserial.
I've attached my test script. The call returns successfully but the pin doesn't actually change. I've also tested /dev/cu* device with the same...
