Review on USB To Serial Adapter DB25 by Chp Rodgers

Two programs I use periodically send commands to a connected device (TNC) to initialize it and the device responds. When using this adapter, data sent back and forth is garbled and most characters are discarded. I need to send CR once or twice to keep computer and TNC in sync so the application can process input from the TNC. Both programs work fine with the old serial port and have worked with other serial to USB adapters (which use an FTDI chip) - not this one. Bafo's requests for help went unanswered.