future technology devices international ltd (ftdi) 373 scotland street, glasgow g5 8qb united kingdom tel.: +44 (0) 141 429 2777 fax: + 44 (0) 141 429 2758 e-mail (support): support1@ftdichip.com web: http: //www.ftdichip.com neither the whole nor any part of the information c ontained in, or the product described in this manua l, may be adapted or reproduced in any material or electronic form without the prior writt en consent of the copyright holder. this product an d its documentation are supplied on an as-is basis and no warranty as to their suitability for a ny particular purpose is either made or implied. fu ture technology devices international ltd will not accept any claim for damages howsoever ari sing as a result of use or failure of this product. your statutory rights are not affected. this product or any variant of it is not intended for us e in any medical appliance, device or system in whi ch the failure of the product might reasonably be expected to result in personal injury . this document provides preliminary information th at may be subject to change without notice. no freedom to use patents or other intellec tual property rights is implied by the publication of this document. future technology devices international ltd, 373 scotland street, glasgow g5 8qb united kingdom. scotland registered number: sc1 36640 copyright ? 2008 future technology devices internat ional limited future technology devices international ltd usb nmc-2.5m usb to usb null modem cable datasheet document reference no.: ft_000054 version 1.00 issue date: 2008-07-16
copyright ? future technology devices internationa l limited 1 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 replace ment for the traditional serial null modem cable. t he traditional null modem cable was used to connect tw o pcs via their rs232 serial ports, but fewer moder n pcs continue to implement the rs232 serial port. th e rs232 port has almost entirely been replaced by t he usb port. however there is still a need to transfer files bet ween pcs that are not networked. the ftdi usb null modem cable (nmc) solves this pro blem and allows a user to connect two pcs using their usb ports. the user can then perform file tra nsfers between the pcs via the usb interface. the nmc cable contains a small internal electronic circuit board encapsulated into the usb connector a t 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 da tasheet, 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 sup ports the ftdichipid?, with each cable end programmed with a unique usb serial number. this ca n 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 ftdichipid projects. the cable requires usb drivers, available free from http://www.ftdichip.com, which are used to make th e ft232r within the cable ends appear as a virtual co m port (vcp). this then allows the user to communicate with the usb interface via a standard p c serial emulation port (tty). another ftdi usb driver, the d2xx driver, can also be used with appl ication software to directly access the ft232r thou gh a dll. this is illustrated in the figure 1.1 : 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 (70a). the cable is fully fcc and ce compliant and operate s over an extended temperature range. tty usb usb tty usb_usb_nmc usb virtual com port software application access to usb via d2xx usb usb_usb_nmc tty tty
copyright ? future technology devices internationa l limited 2 document reference no.: ft_000056 usb nmc-2.5m usb to usb null modem cable datasheet version 1.00 clearance no.: ftdi# 40 table of contents 1 description ....................................... ................................................... ... 1 2 typical applications .............................. ................................................ 3 2.1 driver support .................................... ................................................... .............. 3 2.2 features .......................................... ................................................... .................. 3 3 contact information................................ ............................................... 4 appendix a - ft232r eeprom configuration .......... .................................................. 5 appendix b - revision history ..................... ................................................... .............. 6
copyright ? future technology devices internationa l limited 3 document reference no.: ft_000056 usb nmc-2.5m usb to usb null modem cable datasheet version 1.00 clearance no.: ftdi# 40 2 typical applications ? pc to pc networking using usb port. ? file transfer between pcs. ? password protected file transfer between pcs. 2.1 driver support royalty free virtual com port (vcp) drivers for... ? windows 98, 98se, me, 2000, server 2003, xp and server 2008 ? windows xp and xp 64bit ? windows vista and vista 64bit ? windows xp embedded ? windows ce 4.2, 5.0 and 6.0 ? mac os 8/9, osx ? linux 2.4 and greater royalty free d2xx direct drivers (usb drivers + dll s/w interface) ? windows 98, 98se, me, 2000, server 2003, xp and server 2008 ? windows xp and xp 64bit ? windows vista and vista 64bit ? windows xp embedded ? windows ce 4.2, 5.0 and 6.0 ? linux 2.4 and greater the drivers listed above are all available to downl oad for free from www.ftdichip.com. various 3rd par ty drivers are also available for various other operat ing systems see www.ftdichip.com for details. 2.2 features the usb nmc has the following features: ? usb powered C 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 (70a). ? improved emi performance fcc and ce compliant. ? supports ft232r ftdichipid?, 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). ? 40c to +85 c operating temperature range.
copyright ? future technology devices internationa l limited 4 document reference no.: ft_000056 usb nmc-2.5m usb to usb null modem cable datasheet version 1.00 clearance no.: ftdi# 40 3 contact information head office C glasgow, uk future technology devices international limited 373 scotland street glasgow g5 8qb united kingdom tel: +44 (0) 141 429 2777 fax: +44 (0) 141 429 2758 email (sales) sales1@ftdichip.com email (support) support1@ftdichip.com email (general enquiries) admin1@ftdichip.com web site url http://www.ftdichip.com web shop url http://www.ftdichip.com branch office C taipei, taiwan future technology devices international limited (ta iwan) 4f, no 183, sec. 6 mincyuan east road neihu district taipei 114 taiwan, r.o.c. tel: +886 (0) 2 8791 3570 fax: +886 (0) 2 8791 3576 email (sales) tw.sales1@ftdichip.com email (support) tw.support1@ftdichip.com email (general enquiries) tw.admin1@ftdichip.com web site url http://www.ftdichip.com branch office C hillsboro, oregon, usa future technology devices international limited (us a) 7235 nw evergreen parkway, suite 600 hillsboro, or 971235803 usa tel: +1 (503) 547 0988 fax: +1 (503) 547 0987 email (sales) us.sales@ftdichip.com email (support) us.admin@ftdichip.com web site url http://www.ftdichip.com distributor and sales representatives please visit the sales network page of the ftdi web site for the contact details of our distributor(s) and sales representative(s) in your country.
copyright ? future technology devices internationa l limited 5 document reference no.: ft_000056 usb nmc-2.5m usb to usb null modem cable datasheet version 1.00 clearance no.: ftdi# 40 appendix a - ft232r eeprom configuration each end of the nmc cable is controlled by the ftdi ft232r ic. this ft232r device contains an eeprom which contains the usb configuration descriptors fo r that device. when the cable is plugged into a pc or a usb reset is performed, the pc will read these desc riptors. the default values stored into the interna l eeprom are defined in error! reference source not f ound.. parameter value notes usb vendor id (vid) 0403h ftdi default vid (hex) usb product ud (pid) 6001h ftdi default pid (hex) serial number enabled? yes serial number see note a unique serial number is generated and programmed into the eeprom during device final test. pull down i/o pins in usb suspend disabled enabling this option will make the device pull down on the uart interface lines when the power is shut off (pwren# is high). manufacturer name ftdi product description usb null modem cable max bus power current 90ma power source bus powered device type ft232r usb version 0200 returns usb 2.0 device description to the host. note: the device is be a usb 2.0 full speed device (12mb/s) as opposed to a usb 2.0 high speed device (480mb/s). remote wake up disabled taking ri# low will wake up the usb host controller from suspend. high current i/os disabled enables the high drive l evel on the uart and cbus i/o pins. load vcp driver disabled makes the device load the vcp driver interface for the device. invert txd disabled signal on this pin becomes txd# if enable. invert rxd disabled signal on this pin becomes rxd# if enable. invert rts# disabled signal on this pin becomes rts if enable. invert cts# disabled signal on this pin becomes cts if enable. table 3.1 default internal eeprom configuration the internal eeprom in the ft232r can be reprogram med over usb using the utility program mprog. mprog can be downloaded from the www.ftdichip.com. version 2.8a or later is required for the ft232r chip. users who do not have their own usb vendor id but who would like to use a unique product id in t heir design can apply to ftdi for a free block of unique pids. contact ftdi support for this service.
copyright ? future technology devices internationa l limited 6 document reference no.: ft_000056 usb nmc-2.5m usb to usb null modem cable datasheet version 1.00 clearance no.: ftdi# 40 appendix b - revision history version 1.00 full datasheet released july 2 008
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