USB-COM485-PLUS4 Datasheet
Contents
1. 18 Table 7 1 Import Export Information 20 Copyright 2010 Future Technology Devices International Limited 25 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 Appendix B Revision History Version 1 0 First release 14th September 2009 Version 1 1 Modified the description of Echo function 24th January 2010 Version 1 2 Edited Section 1 3 1 Removed the statement A standard A to B cable is provided 12th April 20102. 2 Table 1 2 Performance Figures 4 Table 1 3 Ordering Information 4 Table 2 1 RS485 DTE to DCE connection 7 Table 3 1 USB mini B Receptacle Pin Out 15 Table 3 2 DE 9P RS485 Pin Out 15 Table 4 1 USB Electrical Details 16 Table 4 2 RS485 Electrical Details 16 Table 4 3 Power Output for USB COM485 PLUS4 16 Table 6 1 Storage Temperature 18 Table 6 2 Operating Temperature
3. 9 Figure 2 5 Automatic Install 10 Figure 2 6 Complete Hardware Installation 10 Figure 2 7 Hardware Ready 11 Figure 2 8 Device Manager 11 Figure 2 9 COM Port and USB Device name Assignment 11 Figure 2 10 COM Port Assignment and Proterties 12 Figure 2 11 Settings Tab 13 Figure 2 12 Advanced Options 13 Figure 5 1 USB COM485 PLUS4 PCB Dimensions 17 List of tables Table 1 1 LED Description
4. 1 1 2 LED Description 2 1 3 Block Diagram 3 1 3 1 Block description 3 1 4 Features 4 1 5 Performance Figures 4 2 Installation 7 2 1 Example Applications and Configurations 7 2 1 1 Wiring 7 2 2 Device Driver Installation 9 2 2 1 Microsoft Windows 9 2 2 2 Mac OS X Linux Windows CE 14 3 Connections 15 3 1 External Connectors
5. 15 3 1 1 USB 15 3 1 2 RS485 15 4 Electrical details 16 4 1 USB 16 4 2 RS485 16 4 3 Power Output 16 5 Mechanical Details 17 5 1 Module Mechanical Dimensions 17 6 Physical Environment Details 18 6 1 Storage 18 6 2 Operating 18 7 Environmental Approvals amp Declarations 19 7 1 EMI Compatibility
6. 19 7 2 Safety 19 7 3 Environmental 19 7 4 Reliability 19 7 4 1 MTTF 19 7 5 Import Export Information 20 8 Troubleshooting 21 8 1 Hardware 21 8 2 Device Driver 21 9 Contact Information 22 Copyright 2010 Future Technology Devices International Limited 6 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 10 Appendix A List of Figures and tables 24 Appendix B Revision History 25 Copyright 2010 Future Technology Devices Internati
7. Server 2008 2003 Vista XP 2000 Windows CE Linux Mac OS X FIFO 2K byte transmit buffer 2K byte receive buffer RS 485 data signals Data Data GND Powered by USB port No external power adapter required 5V output available Serial port speed up to 10Mbps Serial Communication Parameters o Parity None Even Odd o Data bits 7 8 o Flow control X ON X OFF None Four DE 9P male connectors LEDs indicate USB Enumeration RxD TxD for monitoring port status amp easy diagnostics Operating temperature of 40 C to 85 C Echo and non Echo two modes can be selected 1 5 Performance Figures Parameter Performance USB Interface 480Mbps USB 2 0 High Speed RS485 Interface Standard Windows baud rates 300bps to 921 6Kbps Custom baud rates 300bps to 10Mbps through baud rate aliasing See FTDI Application Note Configuring FT232R FT2232 and FT232BM Baud Rates Max Cable Length USB 5m RS485 12m at 10Mbps Table 1 2 Performance Figures Part Number Description USB COM485 PLUS4 USB COM Plus Hi Speed USB to 4 Port RS485 module Table 1 3 Ordering Information Copyright 2010 Future Technology Devices International Limited 5 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 1 Introduction 1 1 1 Functional Description
8. a USB Host or Hub port The maximum cable length is 5 meters according to the USB 2 0 specification FTDI FT4232H FT4232H Hi Speed USB2 0 480Mb s is a quad serial UART interface IC device Operating system device drivers are required in order to operate with the FT4232H in order to provide the Virtual COM Port serial functionality Quad RS485 Level Shifter The RS485 level shifter converts the signals provided by the FT4232H into the voltage levels required by RS485 devices DE 9P Connector Male The DE 9P connectors are configured in an industry standard TIA EIA 574 pin out to provide connection to RS485 peripherals through standard cables See section 3 1 2 Copyright 2010 Future Technology Devices International Limited 4 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 1 4 Features Adds four RS 485 serial ports by connecting to a USB 2 0 Hi Speed interface Easy plug amp play installation and RS 485 device connection Operates with USB 1 1 amp 2 0 Host and Hub ports Industry Standard FTDI chip set amp device drivers for maximum compatibility Microsoft Windows WHQL certified Mac OS X Linux and Windows CE device drivers Installs as a standard Windows COM ports COM port number can be changed to any available COM port number to support HyperTerminal or any other serial communications software application running in Windows Supports Windows
9. exchange data through the USB COM485 PLUS4 to a legacy RS485 peripheral device Copyright 2010 Future Technology Devices International Limited 2 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 1 2 LED Description The USB COM485 PLUS4 uses 9 LEDs to indicate a valid link as well as data traffic according to the following table LED Colour Function Description Yellow x 1 Power ON when USB COM485 PLUS4 is configured and ready Red x 4 TxD Activity Flashes when data is transmitted from the USB COM485 PLUS4 to the attached RS485 device Green x 4 RxD Activity Flashes when data is transmitted from the attached RS485 device to the USB COM485 PLUS4 Table 1 1 LED Description Copyright 2010 Future Technology Devices International Limited 3 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 1 3 Block Diagram FTDI FT4232H High Speed USB Serial Bridge USB miniB Client Connector Channel A Channel B RS485 Level Shifter DE 9P Connector A Channel C Channel D RS485 Level Shifter DE 9P Connector B RS485 Level Shifter DE 9P Connector C RS485 Level Shifter DE 9P Connector D Figure 1 2 USB COM485 PLUS4 Block Diagram 1 3 1 Block description USB Mini B Client Connector This connector provides the interface for connection to
10. 00153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 Figure 2 7 Hardware Ready COM Port Assignment Next to determine which COM port has been assigned open the Windows Device Manager from the System Control Panel Figure 2 8 Device Manager Click on the Plus sign next to the Ports tree and Universal Serial Bus controllers tree to list the available USB device You will see four additional USB Serial Port followed by a COMn assignment And four additional USB Serial Converter A USB Serial Converter B USB Serial Converter C and USB Serial Converter D Figure 2 9 COM Port and USB Device name Assignment Copyright 2010 Future Technology Devices International Limited 12 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 To determine which COM port has been assigned to Converter A B C or D the cursor point to the USB Serial Port COM5 COM6 COM7 COM8 then right click on it and select Properties it shows their relationship to the Converter A B C or D In the figure below the Converter A is assigned to COM5 Converter B is assigned to COM6 Converter C is assigned to COM7 and Converter D is assigned to COM8 Figure 2 10 COM Port Assignment and Proterties Use this COM port number with your application software in order to access the USB COM485 PLUS4 If an application requi
11. Contact Information Head Office Glasgow UK Future Technology Devices International Limited Unit 1 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 Sales sales1 ftdichip com E mail Support support1 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 Taipei Taiwan Future Technology Devices International Limited Taiwan 2F No 516 Sec 1 NeiHu Road Neihu District Taipei 114 Taiwan R O C Tel 886 02 8797 1330 Fax 886 02 8751 9737 E mail Sales tw sales1 ftdichip com E mail Support tw support1 ftdichip com E mail General Enquiries tw admin1 ftdichip com Web Site URL http www ftdichip com Branch Office Shanghai China Future Technology Devices International Limited China Room 408 317 Xianxia Road ChangNing District ShangHai 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 admin1 ftdichip com Web Site URL http www ftdichip com Branch Office 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 ft
12. Future Technology Devices International Ltd FTDI Unit 1 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 Neither the whole nor any part of the information contained in or the product described in this manual may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder This product and its documentation 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 failure 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 injury 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 Unit1 2 Seaward Place Centurion Business Park Glasgow G41 1HH United Kingdom Scotland Registered Number SC136640 Copyright 2010 Future Technology Devices International Limited F
13. S4 is a downstream USB 2 0 Device A standard USB mini B receptacle is mounted inside the USB COM485 PLUS4 to facilitate connection to an upstream USB Host or Hub Pin Number Pin Type Description 1 Power VBUS USB Power provided from upstream USB Host or Hub 2 Bidirectional D USB data signal negative polarity 3 Bidirectional D USB data signal positive polarity 4 ID No connected 5 Ground GND USB signal ground Shield Case Ground Drain typically connected to the host PC case Table 3 1 USB mini B Receptacle Pin Out 3 1 2 RS485 The RS485 ports are configured as Data Terminal Equipment DTE with a 9 contact D Sub Pin connector Pin assignments are according to TIA EIA 485 In addition pin9 of DB9 provides 5VDC to an external device with a maximum current draw of 450mA once the USB COM485 PLUS4 has been enumerated by the system Pin Number Pin Type Description 1 Input Output DATA Pin 2 of 120R Terminating Resistor Only Required if the USB COM485 PLUS4 is the first or last device in a multi drop RS485 System to meet RS485 Termination Requirements 2 Input Output DATA 3 Input Pin 1 of 120R Terminating Resistor Only Required if the USB COM485 PLUS4 is the first or last device in a multi drop RS485 System to meet RS485 Termination Requirements 4 N A N A 5 GND signal ground GND 6 N A N A 7 Input Local echo function control input pin Connec
14. aller values These values can be adjusted through the Advanced driver options as noted in Figure 2 13 The buffer size can be reduced to 64 bytes The latency timer can be set as low as 2ms A setting of 1ms will cause unnecessary USB traffic and could adversely affect data transmission ERRATIC MOUSE POINTER The device driver defaults to query an attached device to find out whether it is a mouse or modem consistent with native COM port operation Some RS485 peripherals constantly send short packets of data causing the host system to think a mouse or modem has been attached These short packets will interfere with normal mouse operation causing the pointer to jump around the screen If this happens disconnect the RS485 device and uncheck the Serial Enumerator option also found on the Advanced driver options screen in Figure 2 13 COM PORT IN USE Windows keeps track of all COM port assignments If multiple FTDIChip products have been connected to a single system the COM port number will increase even if the other devices are not attached If the higher COM port assignments are not acceptable for the application known unused COM port numbers should be uninstalled according to the FTDI installation guide http ftdichip com Documents InstallGuides htm Copyright 2010 Future Technology Devices International Limited 22 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 9
15. dichip com E mail General Enquiries us admin ftdichip com Web Site URL http www ftdichip com Copyright 2010 Future Technology Devices International Limited 23 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 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 2010 Future Technology Devices International Limited 24 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 10 Appendix A List of Figures and tables List of Figures Figure 1 1 USB COM485 PLUS4 1 Figure 1 2 USB COM485 PLUS4 Block Diagram 3 Figure 2 1 USB COM485 PLUS4 Termination resistor 7 Figure 2 2 USB COM485 PLUS4 echo disable 8 Figure 2 3 Hardware Ready 9 Figure 2 4 Found New Hardware Wizard
16. erent from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help 7 2 Safety The USB COM485 PLUS4 is defined as Limited Power Supply LPS device with operating voltages under 60VDC 7 3 Environmental The USB COM485 PLUS4 is a lead free device that complies with the following environmental directives RoHS WEEE REACH PFOS and DecaBDE 7 4 Reliability The USB COM485 PLUS4 is designed as a robust USB Serial module for use in many environments There are no user serviceable parts Any failure will require a replacement of the unit 7 4 1 MTTF The Mean Time To Failure is calculated at TBD hours Copyright 2010 Future Technology Devices International Limited 20 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 7 5 Import Export Information Import Export Information Country of Origin China Harmonized Code TBD Product Description USB to RS485 Development Module Four COM PortS USA ECCN EAR99 No License Required Table 7 1 Import Export Information Copyright 2010 Future Technology Devices International Limited 21 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 8 Troubleshooting 8 1 Hardware Cables are the most common sources of trouble with external devices Check the following USB cable is properly ins
17. erted at both ends Computer power is ON Computer is not in Sleep or Standby If a USB Hub is used be sure it is set for Self Powered operation If a USB Hub is used be sure all cables are properly inserted If all the above are OK the Yellow LED should be lit indicating the device has been recognized by the USB subsystem RS485 cables check the following Check for specific handshake requirements of your RS485 peripheral Because there is not handshake signals ensure the application is set to No Hardware Handshake or equivalent Test the port with a loop back connector Connect DATA to DATA DATA to DATA Use a simple terminal program to check that data is transmitted and received 8 2 Device Driver Ensure the latest device driver is in use See www ftdichip com If other devices with FTDI chips are installed in the system check with all manufacturers of these devices for the latest device drivers See the FTDI installation guides for additional details http ftdichip com Documents InstallGuides htm Common Windows Device Driver Troubles DEVICE TIMES OUT The default settings of the device driver assume typical data transfers of hundreds to thousands or more bytes at a given time Some applications such as a GPS device only send data in short packets often only a few bytes If this is the case it may be necessary to adjust the driver buffer size and or latency timer to sm
18. ll 4 ports may be used by the external device The 5V output is only enabled when the USB interface is not in suspend Parameter Description Minimum Typical Maximum Units Conditions IO Output Power Current 0 250 mA USB interface is not in SUSPEND This is the total current available on all 4 ports Table 4 3 Power Output for USB COM485 PLUS4 Copyright 2010 Future Technology Devices International Limited 17 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 5 Mechanical Details 5 1 Module Mechanical Dimensions Dimensions are in mm The height of the module is dominated by the 4 D type connectors and stands 12 8mm 1mm The D type pins protrude below the PCB by 2 54mm 1mm Figure 5 1 USB COM485 PLUS4 PCB Dimensions Copyright 2010 Future Technology Devices International Limited 18 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 6 Physical Environment Details 6 1 Storage Parameter Description Minimum Typical Maximum Units Conditions T Storage Temperature Range 65 150 oC Table 6 1 Storage Temperature 6 2 Operating Parameter Description Minimum Typical Maximum Units Conditions T Operating Temperature Range 40 85 oC 5 to 95 RH non condensing Table 6 2 Operating Temperature Copyright 2010 Future Techno
19. logy Devices International Limited 19 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 7 Environmental Approvals amp Declarations 7 1 EMI Compatibility FCC and CE The USB COM485 PLUS4 has been tested to be compliant with both FCC Part 15 Subpart B and European EMC Directive NOTE This is a Class B product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures NOTE This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit diff
20. onal Limited 7 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 2 Installation 2 1 Example Applications and Configurations 2 1 1 Wiring Insert the A plug into an available USB Host or Hub port Insert the mini B plug into the mini B receptacle on the USB COM485 PLUS4 DTE Pin Number Signal Name Expected Connect Signal 1 DATA Transmit Receive Data negative polarity Also Terminator 2 DATA Pin 2 of 120R Terminating Resistor Only Required if the USB COM485 PLUS4 is the first or last device in a multi drop RS485 System to meet RS485 Termination Requirements 2 DATA Transmit Receive Data positive polarity DATA 3 Terminator 1 Pin 1 of 120R Terminating Resistor Only Required if the USB COM485 PLUS4 is the first or last device in a multi drop RS485 System to meet RS485 Termination Requirements 4 N A N A 5 GND signal ground GND 6 N A N A 7 echo disable terminal 1 Local echo function control Connect pin7 and pin 8 can disable the local echo function The local echo is enabled by default 8 echo disable terminal 2 Local echo function control Connect pin7 and pin 8 can disable the local echo function The local echo is enabled by default 9 PWR 5V DC output PWR Table 2 1 RS485 DTE to DCE connection Figure 2 1 USB COM485 PLUS4 Termination resistor Copyright 2010 Future Technology Device
21. res use of a different COM port number the assignment may be changed through the Advanced Driver Options settings From the above Properties click on the Port Settings tab Copyright 2010 Future Technology Devices International Limited 13 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 Figure 2 11 Settings Tab Then click on the Advanced button Figure 2 12 Advanced Options This will display the various advanced settings Note the COM port assignment in the upper left Clicking on the drop down list will display the available port numbers Select one that is not in use and click OK on each dialog box to activate the selection Windows will remember this COM port number Copyright 2010 Future Technology Devices International Limited 14 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 2 2 2 Mac OS X Linux Windows CE Device drivers and FTDI installation guides for Mac OS X Linux and Windows CE are available for download on the FTDIChip web sites Follow the respective FTDI installation guides for the chosen operating system Copyright 2010 Future Technology Devices International Limited 15 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 3 Connections 3 1 External Connectors 3 1 1 USB The USB COM485 PLU
22. rnet connection and the Windows Update Service enabled 1 Connect the USB COM485 PLUS4 to your USB Host or Hub 2 The Found New Hardware Wizard will appear The first dialog should ask whether it is acceptable to use the Windows Update Service to find the device driver Figure 2 4 Found New Hardware Wizard 3 Select one of the Yes choices and click Next 4 The following screen appears Copyright 2010 Future Technology Devices International Limited 10 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 Figure 2 5 Automatic Install 5 Wait while the driver is found downloaded and installed This step may take a couple minutes 6 After the files are found and installed click Finish to complete the installation Figure 2 6 Complete Hardware Installation 7 Steps 2 through 6 will repeat The first time installs the basic USB Serial Converter in the USB device tree The second time installs the Virtual COM Port layer in the Ports tree and assigns the COM port number You must install the Virtual COM Port layer four times because the USB COM485 Plus4 has four Virtual COM Ports 8 When both portions of the device driver have been installed successfully the following message will appear indicating that the device is ready Copyright 2010 Future Technology Devices International Limited 11 Document Reference No FT_0
23. s International Limited 8 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 Figure 2 2 USB COM485 PLUS4 echo disable Copyright 2010 Future Technology Devices International Limited 9 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 2 2 Device Driver Installation The USB COM485 PLUS4 module drivers are available for download from www ftdichip com 2 2 1 Microsoft Windows With the device drivers being Windows Hardware Quality Labs WHQL certified they are also available through download directly from the Microsoft Windows Update service This is the best choice when connecting the USB COM485 PLUS4 to a computer running Windows Vista Additional installation options are noted below Installation Executable shown on Windows XP 1 Login to your system as Administrator or a user with Administrator rights 2 Prior to connecting the USB COM485 PLUS4 to the USB Host or Hub port download the latest device driver version from the FTDIChip web site 3 Run this executable to install the device drivers 4 Connect the USB COM485 PLUS4 to your computer A notification will appear near the task bar indicating that new hardware has been installed and is ready for use It is normal if this notice appears twice Figure 2 3 Hardware Ready Windows Update shown on Windows XP You must have an active Inte
24. t pin7 and pin 8 can disable the local echo function The local echo is enabled by default 8 Output Local echo function control output pin Connect pin7 and pin 8 can disable the local echo function The local echo is enabled by default 9 PWR 5V DC output PWR Table 3 2 DE 9P RS485 Pin Out Copyright 2010 Future Technology Devices International Limited 16 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 4 Electrical details 4 1 USB Parameter Description Minimum Typical Maximum Units Conditions USB_VCC Input Power Voltage 4 25 5 0 5 25 V Present when USB cable is attached and USB Host or Hub powered Icc USB current 30 50 mA Does not include power supplied to external device connected to pin 9 Table 4 1 USB Electrical Details 4 2 RS485 Parameter Description Minimum Typical Maximum Units Conditions Vtrans Transmitter output voltage swing 2 V RL 50R CL 50pF Vrec Receiver input voltage range 7 12 V RL 50R CL 50pF ESD HBM N A 15 KV For all RS 485 Inputs and Outputs pin Table 4 2 RS485 Electrical Details 4 3 Power Output The USB COM485 PLUS4 provides 5V DC for an external device that requires power on pin9 of DB9 The maximum allowable current is 500mA including the circuitry of the USB COM485 PLUS4 itself Up to 250mA total output on a
25. uture Technology Devices International Ltd USB COM485 PLUS4 Datasheet Document Reference No FT_000153 Version 1 2 Issue Date 2010 04 12 Copyright 2010 Future Technology Devices International Limited 1 Document Reference No FT_000153 USB COM485 PLUS4 Datasheet Version 1 2 Clearance No FTDI 108 1 Introduction 1 1 Functional Description The USB COM485 PLUS4 is a USB to a quad interface RS485 level serial UART adaptor incorporating FTDI s FT4232H Hi Speed USB2 0 480Mb s to quad serial UART interface IC device The FT4232H handles all the USB signalling and protocols The adaptor provides a fast simple way to connect devices with an RS485 interface to USB USB COM485 PLUS4 is a USB to a quad port RS485 adapter The integrated electronics of the USB COM485 PLUS4 utilise the FTDI FT2232H and includes RS485 level shifters plus TXD RXD LEDs to provide a visual indication of data traffic through the module Figure 1 1 USB COM485 PLUS4 The module uses a standard USB mini B device connector for connection to an upstream host or hub port RS485 level signals are available on an industry standard DE 9P connector The maximum RS485 level data rate is 10Mbps The USB COM485 PLUS4 module requires USB device drivers available free from www ftdichip com which are used to make the USB COM485 PLUS4 appear as a Virtual COM Port VCP This allows existing serial communications software such as HyperTerminal to
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