When you connect your TC 407 to a PC using a serial-to-USB adapter (since modern laptops lack 9-pin serial ports), Windows needs a driver for that adapter chipset (e.g., Prolific PL-2303, FTDI FT232, or Silicon Labs CP210x). Without this, the device won’t appear as a COM port.
Here is the hard truth: There is no specific "Leica TC 407 driver" in the way you think. LEICA TC 407 driver
Windows does not need a driver to recognize the total station itself. Windows needs a driver to recognize the adapter you are using to convert the serial signal to USB. When you connect your TC 407 to a
Your computer treats the TC 407 like a modem. If you are using a standard 9-pin serial cable (DB9 to DB9) on an old industrial laptop with a native COM port, you need zero drivers. The problem arises because modern laptops lack serial ports. Cause: Wrong cable type or flow control mismatch
Some late-production TC 407 models had a proprietary Leica USB port (GDU – GeoCOM Data Upload). For those, you need the Leica USB driver from the 2006 “Leica System 500 CD.” This is extremely hard to find, so most users stick with the RS-232 route.
Cause: Wrong cable type or flow control mismatch.
Fix: