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 The RS232 port has almost entirely been replaced by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 http://www.ftdichip.com, 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.
- 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.
FTDI USB-based Converter Cables and PCB
Assemblies
| USB-NMC-2.5m |
USB to USB Null Modem cable, 2.5m long |
