Bootloader only works once with usb to serial module When programming the Pro Mini using this USB-to-serial adapter the boot loader only works once. After the first programming the programmer is out of sync or not responding.

To be able to program the Pro Mini again I have to burn the bootloader using my Uno as an ISP.

Programming the Pro Mini through an Uno does not present the same problem.

Are the lock bits not being set properly or somehow overridden?
The module I had does not have a DTR signal. I mistook the RTS for DTR. Ordering correct module.