USB-NMC-2.5m - USB Null Modem cable

USB-USB null modem cable can be used to take the place of a traditional serial null modem cable to transfer data between two PCs.

The USB to USB Null Modem Cable is a modern replacement for the traditional serial null modem cable. The traditional null modem cable was used to connect two PCs via their RS232 serial ports, but fewer modern PCs continue to implement the RS232 serial port. The RS232 port has almost entirely been replaced by the USB port.

However there is still a need to transfer files between PCs that are not networked.

The FTDI USB Null Modem Cable (NMC) solves this problem and allows a user to connect two PCs using their USB ports. The user can then perform file transfers between the PCs via the USB interface.

The NMC cable contains a small internal electronic circuit board encapsulated into the USB connector at both ends of the cable. The electronics is based on the FTDI FT232R USB to Serial UART IC and handles all the USB signalling and protocols.

The cable requires USB drivers, available free from, which are used to make the FT232R within the cable ends appear as a virtual COM port (VCP). This then allows the user to communicate with the USB interface via a standard PC serial emulation port (TTY). Another FTDI USB driver, the D2XX driver, can also be used with application software to directly access the FT232R though a DLL.

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

  • USB powered - no external power supply needed.
  • Based on back to back FTDI FT232RQ devices.
  • Entire USB protocol handled by USB connector encapsulated electronics.
  • USB Type A connector on both ends of cable.
  • Data transfer rates from 300 baud to 3 Mbaud at TTL levels.
  • Lower Operating (20mA) and USB suspend mode current (70<A).
  • Improved EMI Performance 2 FCC and CE compliant.
  • Supports FT232R FTDIChip2ID™, with each cable end programmed with a unique USB serial number.
  • Support for USB suspend and resume.
  • UHCI / OHCI / EHCI host controller compatible.
  • USB 2.0 Full Speed compatible.
  • Custom versions also available (subject to MOQ).
  • -40°C to +85° C operating temperature range.
  • PC to PC networking using USB port.
  • File transfer between PCs.
  • Password protected file transfer between PCs.
USB-NMC-2.5m USB to USB Null Modem cable, 2.5m long

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Last updated: 14 May 2019