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Document Reference No.: FT_000056
USB NMC-2.5m USB To USB Null Modem Cable Datasheet Version 1.00
Clearance No.: FTDI# 40
1
Description
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 The RS232 port has almost entirely been replaced by the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 FT232R datasheet, DS_FT232R, is available at
http://www.ftdichip.com
The NMC cable is a USB powered, USB 2.0 full speed compatible, 2.5m cable which supports data transfer
rate up to 3 Mbaud at TTL levels. The NMC cable supports the FTDIChip-ID?, with each cable end
programmed with a unique USB serial number. This can be used to create security or password protected
file transfer between PCs. Further information and examples on this feature are available at
http://www.ftdichip.com under FTDIChip-ID Projects.
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. This is illustrated in the Figure 1.1 :
TTY
TTY
USB_USB_NMC
USB
USB
Virtual COM Port
USB_USB_NMC
USB
USB
TTY
TTY
Software application access to USB via D2XX
Figure 1.1 USB to USB Null Modem Cable Example
The NMC maximum operating current is 20mA (per USB connector), with a very small USB suspend current
(70 A).
The cable is fully FCC and CE compliant and operates over an extended temperature range.
Copyright ? Future Technology Devices International Limited
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