USB – RS485 cable modem driver (required for SM3 and SM4)
This is the driver for the cable used to connect from the computer’s USB port to the instrument’s RS485 connector. That cable has a built in USB-to-RS485 modem. Direct link to FTDI:
Virtual COM Port (VPC) drivers for the USB-RS485 cable
Select the Windows version that corresponds to your CPU, 32-bit or 64-bit.