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future technology devices international limited (ftdi) unit1, 2 seaward place, centurion business park,, glasgow g41 1hh 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 copyright ? 20 10 future technology devices international limited neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or re produced in any material or electronic form without the prior written consent of the copyright holder. this product and its documen tation are supplied on an as - is basis and no warranty as to their suitability for any particular purpose is either made or implied. future technology devices international ltd will not accept any claim for damages howsoever arising as a result of use or fa ilure of this product. your statutory rights are not affected. this product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product might reasonably be expected to result in personal injur y. this document provides preliminary information that may be subject to change without notice. no freedom to use patents or other intellectual property rights is implied by the publication of this document. future technology devices international ltd, uni t1, 2 seaward place, centurion business park, glasgow, g41 1hh, united kingdom. scotland registered number: sc136640 copyright ? 2010 future technology devices international limited future technology devices international ltd usb to rs485 serial converter cable datasheet document reference no.: ft_000117 version 1.4 issue date: 2010 - 0 5 - 2 7
copyright ? 2010 future technology devices international limited 1 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 1 description the usb - rs485 cable is a usb to rs485 levels serial uart converter cable incorporating ftdi?s ft232rq usb to serial uart interface ic device which handles all the usb signalling and protocols. the cable provides a fast, simple way to connect d evices with a rs485 interface to usb. each usb - rs485 cable contains a small internal electronic circuit board, utilising the ft232r, which is encapsulated into the usb connector end of the cable. the ft232r datasheet, ds_ft232r , is available at http://www.ftdichip.com . the integrated electronics also include the rs485 transceiver plus tx and rx leds which give a visual indication of traffic on the cable (if transparent usb connector specified). the other end of the cable is bare, tinned wire ended connections by default, but can be customised using different connectors to support various applications. the usb - rs485 cable is designed for use at the end of an rs485 network up to approximately 10m. for longer networks or plac ement of the usb - rs485 cable in the m iddle of an rs485 network it is recommended that the attached wire is cut to 20c m or less to ensure signal integrity cables are fcc, ce, rohs compliant. the cable is usb powered and usb 2.0 full speed compatible. each cable is 1.8m long and supports a data transfer rate up to 3 mbaud. each cable supports the ftdichip - id?, with a unique usb serial number programmed into the ft232r. this feature can be used to create a security or password protected file transfer access using the cable. further information and examples on this feature are available at http://www.ftdichip.com under ftdichip - id projects . the usb - rs485 cables require usb drivers, available free from http://www.ftdichip.com , whi ch are used to make the ft232r i n the cable 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 ( for example tty). another ftdi usb driver, the d2xx driver, can also be used with application software to directly access the ft232r on the cable though a dll. this is illustrated in the figure 1 . 1 figure 1 . 1 using the usb - rs485 cable v c p t t y u s b u s b _ r s 4 8 5 v i r t u a l c o m p o r t s o f t w a r e a p p l i c a t i o n a c c e s s t o u s b v i a d 2 x x u s b t t y d 2 x x d l l w i r e e n d e d c u s t o m i s e d c o n n e c t o r s v a r i o u s c o n n e c t o r o p t i o n s w i r e e n d e d v a r i o u s c o n n e c t o r o p t i o n s c u s t o m i s e d c o n n e c t o r s
copyright ? 2010 future technology devices international limited 2 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 2 cable part numbers the following table 2 . 1 gives details of the available usb - rs485 cables. part number description end connector* cable details usb - rs485 - we - 1800 - b t usb to uart cable with rs485 level uart signals. b lack cable, t ransparent usb connector w ire e nded (no connector) 1.8m cable,6 core, ul2464 24 awg, diam=5mm * usb - rs485 - cc - llll - cu - x usb to uart cable with rs485 level uart signals. c = cable colour ( b black or t transparent), u = usb connector colour ( t transparent or b black) x = voltage (p is 5v, g is 0v) c c = connector description. llll = length of cable. table 2 . 1 usb - rs485 cables descriptions and part numbers * ftdi supports customised end connector designs. for more information, please contact ftdi sales team (sales1@ftdichip.com) 2.1 certifications ftdi usb - rs485 cable is fully rohs compliant as well as ce and fcc certified . fcc part 15, subpart b, class b. cispr 22: 1997+a1: 2000, class b . ices - 003: 2004, class b . ansi c63.4 - 2003 . 2.1 usb compliant the usb - r 485 cable s are fully compliant with the usb 2.0 specification.
copyright ? 2010 future technology devices international limited 3 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 table of contents 1 description ................................ ................................ ..................... 1 2 cable part numbers ................................ ................................ ........ 2 2.1 certifications ................................ ................................ ................................ . 2 2.1 usb compliant ................................ ................................ .............................. 2 the usb - r485 cable is fully compliant with the usb 2.0 specification. ................... 2 3 typical applications ................................ ................................ ........ 4 3.1 driver support ................................ ................................ .............................. 4 3.2 features ................................ ................................ ................................ ........ 4 4 features of ft232r applicable to usb - rs485 cable ....................... 5 5 usb - rs485 - we - llll - cu - x ................................ ............................. 6 5.1 usb - rs485 - we connections and mechanical details ................................ ..... 6 5.2 usb - rs485 - we cable signal descriptions ................................ ..................... 7 5.3 usb - rs485 - we electrical parameters ................................ ........................... 7 5.4 local echo ................................ ................................ ................................ ..... 8 6 cable pcb block diagram ................................ ................................ 9 7 usb - rs485 C schematic ................................ ............................... 10 8 contact information ................................ ................................ ..... 11 appendix a - cable eeprom configuration ................................ ......... 13 appendix b - list of figures and tables ................................ .............. 14 appendix c - revision history ................................ ............................ 15
copyright ? 2010 future technology devices international limited 4 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 3 typical applications usb to serial rs485 level converter. upgrading legacy peripherals to usb. interface microcontroller uart or i/o to usb. interface fpga or pld to usb. usb instrumentation pc interface. usb industrial control. usb password protected file transfers. 3.1 driver support royalty free virtual com port (vcp) drivers for... window s 7 64 - bit windows xp and xp 64 - bit windows vista and vista 64 - bit windows xp embedded windows 98, 98se, me, 2000, server 2003, and server 2008 windows ce 4.2, 5.0 and 6.0 mac os 8/9, os - x linux 2.4 and greater royalty free d2xx direct drivers (usb drivers + dll s/w interface) window s 7 64 - bit windows xp and xp 64 - bit windows vista and vista 64 - bit windows xp embedded windows 98, 98se, me, 2000, server 2003, and server 2008 windows ce 4.2, 5.0 and 6.0 linux 2.4 and greater mac os - x the drivers listed above are all available to download for free from www.ftdichip.com . various 3rd party drivers are also available for other operating systems - see www.ftdichip.com for details. 3.2 features usb - rs485 converter cable provides a usb to rs485 serial interface with customised end connectors. entire usb protocol handl ed by the electronics in the cable . eia/tia - 485 communication interface with low power requirements. uart interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity. internal eeprom with user writeable area. ftdi?s r oyalty - free vcp allow for communication as a standard emulated com port and d2xx ?direct? drivers provide dll application programming interface. visual indication of tx and rx traffic via leds in the transparent usb connector. x - on / x - off software handsh aking. data transfer rates from 300 baud to 3 mbaud. support for ft232r ftdichip - id? feature for improved security. low usb bandwidth consumption. uhci / ohci / ehci host controller compatible. usb 2.0 full speed compatible. - 40c to +85c operating temperature range. cable length is 1.80m (6 feet). esd protection for rs - 485 i/o's 15kv human body model (hbm) 15kv en61000 - 4 - 2 air gap discharge 8kv en61000 - 4 - 2 contact discharge fcc and ce compliant. custom versions available on request (subject to moq). rohs compliant
copyright ? 2010 future technology devices international limited 5 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 4 features of ft232r applicable to usb - rs485 cable the usb - rs485 cable use s ftdi?s ft232rq usb to serial uart ic device. this section summarises the key features of the ft232rq which apply to the usb - rs485 usb to serial rs485 converter cables. for further details, and a full features and enhancements description consult the ft232 r datasheet. this is available from www.ftdichip.com . internal eeprom. the internal eeprom in each cable is used to store usb vendor id (vid), product id (pid), device serial number, product description string and various other usb configuration descriptors. each cable is supplied with the internal eeprom pre - programmed as described in appendi x a C cable eeprom configura tion . the internal eeprom descriptors can be programmed in circuit, over usb without any additional voltage requirement. it can be programmed using the ftdi utility software called mprog, which can be downloaded from ftdi utilities on the ftdi website ( www.ftdichip.com ). additionally, there is a user area of the internal eeprom available to system designers to allow storing of data (note that this is not modified by mprog). lower operating and suspend current. the ft232r has a low 15ma operating supply current and a very low usb suspend current of approximately 70a. (note that during suspend mode, the current drawn by any cu stomised cable application which uses the usb supply, should not exceed 2.5ma to remain usb compliant) low usb bandwidth consumption. the usb interface of the ft232r, and therefore the usb - rs485 cables has been designed to use as little as possible of the total usb bandwidth available from the usb host controller. ftdichip - id?. the ft232r includes the new ftdichip - id? security dongle feature. this ftdichip - id? feature allows a unique number to be burnt into each cable during manufacture. this number cannot be reprogrammed. this numb er is only readable over usb can be used to form the basis of a security dongle which can be used to protect any customer application software being copied. this allows the possibility of us ing the usb - rs485 cables as a dongle for software licensing. further to this, a renewable license scheme can be implemented based on the ftdichip - id? number when encrypted with other information. this encrypted number can be stored in the user area of the ft232r internal eeprom, and can be decrypted, then compared with the protected ftdichip - id? to verify that a license is valid. web based applications can be used to maintain product licensing this way. an application note, an232r - 02 , available from ftdi website ( www.ftdichip.com ) describes this feature. improved emi performance. the usb - rs485 cables are fcc and ce certified. extended operating temperature range - the usb - rs485 cables are capable of operating over an extended temperature range of - 40o to +85o c thus allowing them to be used in automotive or industrial applications.
copyright ? 2010 future technology devices international limited 6 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 5 usb - rs485 - we - llll - cu - x the usb - rs485 - we cable is un - terminated; it has bare and tinned wires. the llll specifies the length of the cable in cm . the cu specifies the colour of the cable and the colour of the usb connector. the cable can be either black or transparent. the usb c onnector comes default as transparent because of led implemented inside the plug but can be sold in black colour as well . for simplicity, the llll and cu have been dropped from the following descriptions. the cable outputs 5 v power on the wire by default. t his can be modified to output 0 v power. the letter x in the part number indicates the output power selection. 5.1 usb - rs485 - we connections and mechanical details the following figure 5 . 1 shows the cable signals and the wire colours for the signals on the usb - rs485 - we cable. figure 5 . 1 usb - rs485 - we connections figure 5 . 2 usb - rs485 - we mechanical details (dimensions in mm) figure 5 . 3 usb - rs485 - we cable images
copyright ? 2010 future technology devices international limited 7 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 5.2 usb - rs485 - we cable signal descriptions colour name type description black gnd gnd device ground supply pin. brown terminator 1 input pin 1 of 120r terminating resistor. only required if the usb - rs485 - we cable is the first or last device in a multi - drop rs485 system, to meet rs485 termination requirements. red power output default output is +5v when active, 0v during suspend. pow er output can be customized to 0v, i f required, contact ftdi sales team (sales1@ftdichip.com) . switchable power to external device, 250ma max. off during suspend orange data + (a ) bi - direction data + (a ) signal yellow data - (b ) bi - direction data - (b ) signal green terminator 2 input pin 2 of 120r terminating resistor. only required if the usb - rs485 - we cable is the first or last device in a multi - drop rs485 system, to meet rs485 termination requirements. table 5 . 1 usb - rs485 - we cable signal descriptions 5.3 usb - rs485 - we electrical parameters parameter description minimum typical maximum units conditions vcc _5v output power voltage * 4.25 5.0 * 5.25 v this only applies when cable has been configure d to output 5 v. the range is d ependent on the usb port that the usb - rs485 - we is connected to i o output power current *** - 250 ma must be less that 2.5ma during suspend. t operating temperature range - 40 +85 o c table 5 . 2 usb - rs485 - we i/o operating parameters *default is 5v. ***only applies when power output is 5v.
copyright ? 2010 future technology devices international limited 8 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 parameter description minimum typical maximum units conditions receiver input vcm common - mode input voltage range - 7 +12 v in input current 1.0 ma vin = +12v C 0.8 vin = C 7v vth differential threshold voltage,vth - 0.2 +0.2 v vihyst input hysteresis 20 mv rin input resistance, rin 12 15 k transmitter output vod differential output voltage, dvod 1.5 5 v with rl = 54 . cl = 50pf * table 5 . 3 usb - rs485 - we i/o pin characteristics * - the 54 ohms is the equivalent of two 120 ohm termination resistors placed on each side of the transmission line and the input impedance of 32 receivers on the line. description conditions minimum typical maximum esd hbm rs - 485 inputs and outputs 15 kv en61000 - 4 - 2contactdischarge rs - 485 inputs and outputs 8 kv en61000 - 4 - 2airgapdischarge rs - 485 inputs and outputs 15 kv table 5 . 4 usb - rs485 - we esd tolerance 5.4 local echo rs485 systems often have local echo enabled. this means any data transmitted by a device is echoed back to itself. the usb - rs485 - we cable allows for local echo to be enabled/disabled by changing a bit in the ft232r eeprom. if cbus4 in the eeprom is set for pwron# local echo is enabled. if cbus4 in the eeprom is s et for txden local echo is disabled. users can set this with mprog from www.ftdichip.com the default for the local echo is disabled (cbus4 set for txden).
copyright ? 2010 future technology devices international limited 9 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 6 cable pcb block diagram the block diagram for the small internal electronic circuit board, utilising the ftdi ft232r, which is encapsulated into the usb connector end of the cable, is shown in figure 6 . 1 . customised versions of the cable are also available. users interested in customised versions of these cables should contact ftdi sales (sales1@ftdichip.com) . figure 6 . 1 block diagram of pcb used in the usb to rs485 serial converter cable
copyright ? 2010 future technology devices international limited 10 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 7 usb - rs485 C schematic schematic for converter cable, usb - rs485 is shown below in figure 7.1 figure 7. 1 schematic of usb - rs485 converter cable
copyright ? 2010 future technology devices international limited 11 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 8 contact information head office C glasgow, uk future technology devices international limited unit 1, 2 seaward place, centurion business park glasgow g 41 1hh united kingdom tel: +44 (0) 141 429 2777 fax: +44 (0) 141 429 2758 e - mail (sales) sales 1 @ftdichip.com e - mail (support) support 1 @ftdichip.com e - mail (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 technolog y devices international limited (taiwan) 2f, no. 516, sec. 1, neihu road taipei 114 taiwan , r.o.c. tel: +886 (0) 2 879 1 3570 fax: +886 (0) 2 87 9 1 3576 e - mail (sales) tw.sales1@ftdichip.com e - mail (support) tw.support1@ftdichip.com e - mail (general e nquiries) tw.admin1@ftdichip.com web site url http://www.ftdichip.com branch office C hillsboro, oregon, usa future technology devices international limited (usa) 7235 nw evergreen parkway, suite 600 hillsboro, or 97123 - 5803 usa tel: +1 (503) 547 0988 fax: +1 (503) 547 0987 e - mail (sales) us.sales@ftdichip.com e - mail (support) us.support@ftdichip.com e - mail (general enquiries) us.admin@ftdichip.com web site url http://www.ftdichip.com branch office C shanghai , china future technology devices international limited ( china ) room 408 , 317 xianxia road, shanghai, 200051 china tel: +86 21 62351596 fax: +86 21 62351595 e - mail (sales) cn .sales@ftdichip.com e - mail (support) cn.support@ftdichip.com e - mail (general enquiries) cn .admin@ftdichip.com web site url http://www.ftdichip.com
copyright ? 2010 future technology devices international limited 12 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 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. vinculum is part of future technology devices international ltd. neither the whole nor any part of the information contained in, or the product described in t his manual, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyrigh t holder. this product and its documentation are supplied on an as - is basis and no warranty as to their suitability for any particu lar purpose is either made or implied. future technology devices international ltd will not accept any claim for damages howsoever arising as a result of use or failure of this produ ct. your statutory rights are not affected. this product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product might reasonably be expected to result in personal injury. this document provides preliminary information that may be subject to ch ange without notic e. no freedom to use patents or other intellectual property rights is implied by the publication of this document. future technolog y devices international ltd, unit 1, 2 seaward place, centurion business park , glasgow g 41 1hh united kingdom. scotland regis tered number: sc136640
copyright ? 2010 future technology devices international limited 13 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 appendix a - cable eeprom configuration each usb - rs485 cable is controlled by the ftdi ft232r ic. this ft232r device contains an eeprom which contains the usb configuration descriptors for that device. when the cable is plugged into a pc or a usb reset is performed, the pc will read these descriptors. the default values stored into the intern al eeprom are defined in table 0 . 1 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 see note usb - rs485 - we max bus power current 250 ma power source bus powered device type ft232r usb version 0200 returns usb 2.0 device description to the host. note: the device is 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 high current i/os enabled enables the high drive level on the uart and cbus i/o pins. load vcp driver enabled 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 0 . 1 default internal eeprom configuration the internal eeprom in the cable can be re - programmed 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 wo uld like to use a unique product id in their design can apply to ftdi for a free block of unique pids. contact ftdi support for this service.
copyright ? 2010 future technology devices international limited 14 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 appendix b - list of figures and tables list of figures figure 1.1 using the usb - rs485 cable ................................ ................................ ............ 1 figure 5.1 usb - rs485 - we connections ................................ ................................ ............ 6 figure 5.2 usb - rs485 - we mechanical details (dimensions in mm) ................................ ...... 6 figure 5.3 usb - rs485 - we cable images ................................ ................................ .......... 6 figure 6.1 block diagram of pcb used in the usb to rs485 serial converter cable ................ 9 figure 7.1 schematic of usb - rs485 converter cable ................................ ....................... 10 list of tables table 2.1 usb - rs485 cables descriptions and part numbers ................................ .............. 2 table 5.1 usb - rs485 - we cable signal descriptions ................................ .......................... 7 table 5.2 usb - rs485 - we i/o operating parameters ................................ .......................... 7 table 5.3 usb - rs485 - we i/o pin characteristics ................................ .............................. 8 table 5.4 usb - rs485 - we esd tolerance ................................ ................................ .......... 8 table 0.1 default internal eeprom configuration ................................ ............................ 13
copyright ? 2010 future technology devices international limited 15 document reference no.: ft_000117 usb to rs485 serial converter cable datasheet version 1. 4 clearance no.: ftdi #75 appendix c - revision history version draft first draft jan, 2009 ve rsion 1.0 first release 11 th feb , 2009 version 1.1 added and corrected images 14 th may 2009 version 1.2 corrected default state of the power pin added window s 7 64 - bit added description C length of the cable/wire recommendations 29 th october 2009 version 1.3 changed tt to bt (transparent to black cable) 18 th dec ember 2009 version 1. 4 edited figure 5 .1 , 6.1 and table 5.1 , signals a data +ve and 27 th july 2010 b data - ve added fcc certification details added section 2.1 usb compliant logo

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