USB232 Converter User Guide - Advantage
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1. Advantage Devices USB232 Converter User Manual Copyright and Trademark Copyright w 2009 Advantage Devices All rights reserved No part of this manual may be reproduced or transmitted in any form for any purpose other than the purchaser s personal use without the express written permission of Advantage Devices Advantage Devices has made every effort to provide complete details about the product in this manual but makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability or fitness for a particular purpose In no event shall Advantage Devices be liable for any incidental special indirect or consequential damages whatsoever included but not limited to lost profits arising out of errors or omissions in this manual or the information contained herein Advantage Devices products are not designed intended authorized or warranted for use as components in systems intended for surgical implant into the body or in other applications intended to support or sustain life or in any other application in which the failure of a Advantage Devices product could create a situation where personal injury death or severe property or environmental damage may occur Advantage Devices reserves the right to discontinue or make changes to its products at any time without notice Advantage Devices and the Advantage Devices logo and combinations thereof are registered tra2. lines e Software drivers e Windows 2000 XP Vista and Mac e Optional EEPROM for vendor data 1 2 Design Reference The Exar USB UART 1 Channel Evaluation Board was used as the reference design for the USB232 converter design e Exar XR21V1410IL16 QFN16 USB UART V 1410 e Exar SP3244EEY L TSSOP 28 RS232 transceiver e Exar SP6669AEK L TTR3 SOT23 5 Voltage regulator or similar design e Inrush limiter e DB9 with male pins wired as a DTE device e Interface Description 1 2 USB232 Converter User Guide 1 3 Driver Installation Software setup requires installing the USB232 device driver The device driver allows the USB232 device to appear to the PC s application software as an additional COM port in addition to any existing hardware COM ports Application software running on the PC accesses the USB232 device as it would access a standard hardware COM port However actual data transfer between the PC and the USB232 device is performed over the USB Therefore existing COM port applications may be used to transfer data via the USB to the USB232 based device without modifying the application All drivers are now supplied on the software CD See the EXAR website for additional driver support for the XR21V1410 You can reach EXAR tech support at uarttechsupport amp exar com 1 3 1 Driver Installation Windows XP Vista Follow these steps to install the Windows XP Vista driver 1 Connect the USB cable between the host computer and th
3. product in an unauthorized or improper way or in an environment for which it was not designed Advantage Devices warrants the media containing software and technical information to be free from defects and warrants that the software will operate substantially for a period of 60 DAYS after the date of shipment In no event will Advantage Devices be responsible to the user in contract in tort including negligence strict liability or otherwise for any special indirect incidental or consequential damage or loss of equipment plant or power system cost of capital loss of profits or revenues cost of replacement power additional expenses in the use of existing software hardware equipment or facilities or claims against the user by its employees or customers resulting from the use of the information recommendations descriptions and safety notations supplied by Advantage Devices Advantage Devices liability is limited at its election to 1 refund of buyer s purchase price for such affected products without interest 2 repair or replacement of such products provided that the buyer follows the above procedures There are no understandings agreements representations or warranties expressed or implied including warranties of merchantability or fitness for a particular purpose other than those specifically set out above or by any existing contract between the parties The contents of this document shall not become part of or modify any
4. 232 Converter User Guide 1 5 1 6 5 1 4 6Automatic XON XOFF Software Flow Control When software flow control is enabled the V1410 compares the receive data characters with the programmed Xon or Xoff characters If the received character matches the programmed Xoff character the V1410 will halt transmission as soon as the current character has completed transmission Data transmission is resumed when a received character matches the Xon character 1 7 Schematic The schematic can be broken into functional sections 1 7 1 USB Soft Connect The soft connect circuit allows the unit to be connected without a large inrush current Q1 is a P channel MOSFET rated at 12V 4 1A The gate charge is controlled by C1 and R1 As the gate charge voltage is increased the channel opens to allow USB 5VDC on J1 pin 1 to be applied to other circuits USB data is supplied on J1 pins 2 and 3 Figure 3 Soft Start 1 7 2 Transient Suppressor A USB Port Transient Suppressor U2 circuit has been added to the USB data lines The SN75240 is a dual transient voltage suppressor designed to provide electrical noise transient protection to Universal Serial Bus USB full speed ports Any cabled I O can be subjected to electrical noise transients from various sources These noise transients can cause damage to the USB transceiver and or the USB ASIC if they are of sufficient magnitude and duration USB ports are typically implemented in 3 V or 5 V digital CMOS w
5. able See USB Cable Options on page 1 10 The USB interface of the V1410 is compliant with the USB 2 0 Full Speed Specifications The USB configuration model presented by the V1410 to the device driver is compatible to the Abstract Control Model of the USB Communication Device Class CDC ACM The V1410 uses the following set of parameters e 1 Control Endpoint e Endpoint 0 as outlined in the USB specifications e 1 Configuration is supported e 2interfaces for the UART channel e Single interrupt endpoint e Bulk in and bulk out endpoints 1 5 1 USB Vendor ID Exar s USB Vendor ID is 0x04E2 This is the default Vendor ID that is used for the USB232 Converter 1 5 2 USB Product ID The default USB Product ID for the USB232 Converter is 0x 1410 1 4 USB232 Converter User Guide 1 6 UART Manager The UART Manager enables disables the UART including the TX and RX FIFOs 1 6 1 Transmitter The transmitter consists of a 128 byte TX FIFO and a Transmit Shift Register TSR Once a bulk out packet has been received and the CRC has been validated the data bytes in that packet are written into the TX FIFO of the specified UART channel Data from the TX FIFO is transferred to the TSR when the TSR is idle or has completed sending the previous data byte The TSR shifts the data out onto the TX output pin at the data rate defined by the CLOCK DIVISOR and TX CLOCK MASK registers The transmitter sends the start bit followed by the data bits starting with th
6. demarks of Advantage Devices All other product names company names logos or other designations mentioned herein are trademarks of their respective owners USB232 Converter is a trademark of Gridconnect Advantage Devices Otto R hm Strasse 69 64293 Darmstadt Germany Phone 49 6151 6294871 Technical Support Phone 49 6151 6294871 Fax 49 6151 817329 On line www Advantage Devices com USB232 Converter User Guide Disclaimer and Revisions Date Author Comments 02 05 10 A GR Preliminary Release 09 08 10 B GR Updates to drivers 01 06 10 C GR Updates to drivers USB232 Converter User Guide Warranty Advantage Devices warrants each product to be free from defects in material and workmanship for a period of ONE YEAR after the date of shipment During this period if a customer is unable to resolve a product problem with Advantage Devices Technical Support a Return Material Authorization RMA will be issued Following receipt of a RMA number the customer shall return the product to Advantage Devices freight prepaid Upon verification of warranty Advantage Devices will at its option repair or replace the product and return it to the customer freight prepaid If the product is not under warranty the customer may have Advantage Devices repair the unit on a fee basis or return it No services are handled at the customer s site under this warranty This warranty is voided if the customer uses the
7. e LSB inserts the proper parity bit if enabled and adds the stop bit s The transmitter can be configured for 7 or 8 data bits with parity or 9 data bits with no parity XR21V1410 128 byte gt TX Baud TX FIFO Internal Rat 48MHz P ao Oscillat Generator 384 bytele RX u RX FIFO gt RTS USB Device Kima i CTS Interface Control MODEM I O gt DTR Registers SIR a a RI UART Figure 2 UART Block Diagram 1 6 2 Receiver The receiver consists of a 384 byte RX FIFO and a Receive Shift Register RSR Data that is received in the RSR via the RX pin is transferred into the RX FIFO along with any error tags such as Framing Parity Break and Overrun errors Data from the RX FIFO can be sent to the USB host by sending a bulk in packet 1 6 3 Automatic RTS CTS Hardware Flow Control Automatic RTS flow control is used to prevent data overrun errors in local RX FIFO by de asserting the RTS signal to the remote UART When there is room in the RX FIFO the RTS pin will be re asserted Automatic CTS flow control is used to prevent data overrun to the remote RX FIFO The CTS input is monitored to suspend restart the local transmitter 1 6 4 Automatic DTR DSR Hardware Flow Control Auto DTR DSR hardware flow control behaves the same as the Auto RTS CTS hardware flow control described above except that it uses the DTR and DSR signals USB
8. e USB232 target device 2 Windows will open a Found New Hardware Wizard window 3 Select NO not at this time to have Windows connect to Windows Update to search for software Click Next to continue The wizard will assist in installing software for XR21V1410 USB UART Select Install from a list or specific location Advanced and press Next Select Include this location in the search SUD Zb S Press Browse to locate the D drivers xp2kvista7 directory Select x64 folder for 64 bit systems or x86 folder for 32 bit systems Once the folder is selected press OK 8 Verify that the correct path and filename are shown and click Next 9 Verify the correct driver is selected Click Next to continue 10 If the Windows logo testing warning click Continue Anyway 11 Press Finish to finish installing the device drivers 12 A popup will indicate the driver is installed and the device is ready to use USB232 Converter User Guide 1 3 1 4 RS232 Interface The RS232 serial interface is through a DB9 Male connector wired according to the following table Pin assignments are from the evaluation board schematics CONNECTION Ring Indicator CTS RTS DSR Ground DTR TXD RXD Carrier Detect 1 5 USB Interface The standard unit comes with an 8 USB A cable permanently attached to the circuit board You can order a USB 232 unit with a USB connector that allows you to use any length USB c
9. ith very limited ESD protection The SN75240 can significantly increase the port ESD protection level and reduce the risk of damage to the circuits of the USB port Figure 4 USB Transient Suppressor 1 6 USB232 Converter User Guide 1 7 3 USB UART The XR21V1410 V1410 is an enhanced Universal Asynchronous Receiver and Transmitter UART with a USB interface The USB interface is fully compliant to Full Speed USB 2 0 specification that supports 12 Mbps USB data transfer rate The USB interface also supports USB suspend resume and remote wakeup operations The V1410 operates from an internal 48MH7Z clock therefore no external crystal oscillator is required With the fractional baud rate generator any baud rate can accurately be generated using the internal 48MHz clock The large 128 byte FIFO and 384 byte RX FIFO of the V1410 helps to optimize the overall data throughput for various applications Software drivers for Windows 2000 XP and Vista are supported for the XR21V1410 See the EXAR website for additional drivers 3v3 3v3 d d DCD TIL 19 c Cl cH c TIIN TON T3 IN TIL RI OUT R2 OUT R3 OUT R4 OUT RS OUT SHUTDOWN ONLDNES De dd i of nm d Figure 5 USB UART 1 7 4 Sleep Mode The XR21V will use the LPWR Low Power signal to shut down the RS232 transceiver and some internal circuits This will save power when no data signals are active The low power mode takes effect in abo
10. nsient Suppressor cee ceeceeeceeeeeseeeeeeeeeeeeseesaeecaaecsaecaecsaeesseeeeeeeseeeeaeeees 1 6 igure SWS B UALR KEE 1 7 Figure 6 RS232 TransCeiver so dessiner ioni es sin eech eech Seege 1 9 Figure Power Supply EELER ENNER EES EEN 1 9 Fiure 8 R XD EI KEE 1 9 Fisure I TXD LED DEE 1 9 Figure 10 USB 232 with B Connector ursuuessnesnnesnnesnnesnnnennnennnnnnnnnnnnnnnennennnonsnnnnnernennn 1 10 USB232 Converter User Guide 1 Introduction RS232 is still commonly used by industrial equipment manufacturers Its purpose is usually for setup commissioning diagnostics and firmware upgrades to individual devices like PLCs motion controllers drives sensors etc Usually the systems engineer or technician is working out on the factory floor with a laptop PC The problem is that it is getting harder to find a new laptop with legacy COMM ports The usual solution is to purchase a USB to RS232 converter in the form of a dongle Implementations to date using the FTDI or Prolific chip have not been very successful The failure modes have been to either stop working or to crash the operating system Some laptops still available with COMM ports go through a USB layer internally and suffer from the same problems The Exar USB UART hardware and software is by far the best solution to date The Exar evaluation board has been tested by a major motion control distributor and found to be compatible with almost all existing and legacy prod
11. prior or existing agreement commitment or relationship USB232 Converter User Guide Contents Table of Contents 1 Kee EE 1 1 1 1 WSB 232 TEE 1 2 L Design Reference nee Ra 1 2 1 3 Driver Tistallattomicccs ccccssssscoscssnaccsvarcasesderausesarencedcaraacedioaransesdsssedenessnecedcssacesdinanaess 1 3 1 3 1 Driver Installation Windows SDiNieta even even even enes ene eeeneee 1 3 LA RS232 Lg 1 4 FS US BT LEE FASE E 1 4 1 5 1 USB Vendor UD EE 1 4 1 5 2 USB Prod ct ID a na 1 4 1 6 UART M naser nee ke ee ee u 1 5 LG A Transmitter san I eh 1 5 1 6 2 Receiver an ee rel re er 1 5 1 6 3 Automatic RTS CTS Hardware Flow Control 1 5 1 6 4 AutomaticDTR DSR Hardware Flow Control 1 5 1 6 5 1 4 6Automatic XON XOFF Software Flow Control 1 6 1 7 SCHEM LIE essen sandra es 1 6 1 7 1 USB Soft Connect nase aa aaa 1 6 1 7 2 Transient S ppressor su 1 6 17 3 RE BEN CM RE 1 7 1 7 4 lege eege giereg 1 7 1 7 5 RS232 Transceiver NNN EEN NEENNENE NENNEN NEEN EEN NENNEN AEN RENE NSA 1 8 1 7 6 Power Supply Besen Eege 1 9 1 7 1 RS232 Activity LEDS sauer nike 1 9 1 8 USB C ble Options u kin 1 10 1 9 Software Reoutrementz nenn 1 10 List of Figures Figure 1 USB 232 Block Diagram soscicciisisorirsiiisiscrirereriiisirsrosrisnirriisicisniisivesiidrijerio iiaei 1 1 Figure 2 UART Block Diagram 2 22422242222022202nsnnnneennnennnennennennnnnnnnnnnnnnnennennnnnnnnnann 1 5 BIHUTE 3 SOFL EE 1 6 Figure 4 USB Tra
12. r an ESD event the SP3244E 3245E will keep working without latch up or damage The transmitter outputs and receiver inputs of the SP3244E 3245E are characterized for protection to the following limits e 15kV using the Human Body Model e 8kV using the Contact Discharge method specified in IEC 1000 4 2 e 15kV using the Air Gap Discharge method specified in IEC 1000 4 2 a3 GND sl 2 3 2 10K Rid 2 cr anne ps us c2 E i DTR 2 TIN i S TIL CHASSIS Se Al OUT ge RYD TIL R2 OUT 3v3 HeH OUT ta R4 OUT a RS OUT ASER 1000pF 2KV Ca i Bd ll GD DES MALE 1000pF ZEV G x MAGI 70 1 8 USB232 Converter User Guide Figure 6 RS232 Transceiver 1 7 6 Power Supply The power supply converts USB 5VDC J1 pin 1 to regulated 3 3VDC The LM1117 is a more robust switching regulator than the one used in the reference design D5 is an LED power indicator Jl Figure 7 Power Supply 1 7 7 RS232 Activity LEDs An LED has been added for the RXD and TXD data lines LEDs are mounted so that the top sticks out of the case to provide a wide viewing angle ii gridconnect USB 232 Adapter TX Figure 9 TXD LED USB232 Converter User Guide 1 9 1 8 USB Cable Options The standard unit is supplied with an 8 USB A cable with a strain relief An optional USB B connector can be installed on the circuit board This will allow the user to plug in different lengths of USB cables Contact Advantage Devices sales
13. to custom order the USB232 adapter Figure 10 USB 232 with B Connector 1 9 Software Requirements COMM Port drivers are supplied by EXAR The software CD contains this user manual and all current drivers Go to the EXAR web site for additional driver information You can reach EXAR tech support at uarttechsupport exar com 1 10 USB232 Converter User Guide
14. ucts as well as other vendor OEM products The USB232 converter design uses the Exar evaluation board as a reference design The optimized drivers supplied by Exar will be used A block diagram is shown below XR21V1410 Soft Le 3 3V I Start Regulator 128 byte gt TX Baud TX FIFO Internal Rate Basis Generator 384 byte 4 RX scillator RX FIFO VBUS RTS lt DM gt USB Device ee d rr CTS DP Interface MODEM I O gt DTR GND Control wl DSR Registers a CD USB B Type 4 RI Connector UART RS232 Interface DB9 Male Connector RS232 TX RS232 RX RS232 RTS RS232 CTS RS232 DTR RS232 DSR RS232 CD RS232 RI 1 3 lt 2 7 75 kA 6 1 lt 9 Figure 1 USB 232 Block Diagram USB232 Converter User Guide 1 1 1 1 USB 232 Features e USB 2 0 Compliant Interface e Supports 12 Mbps USB full speed data rate e Supports USB suspend resume and remote wakeup operations e USB Port Transient Suppressor e Enhanced UART Features e Data rates up to 12 Mbps e 128 byte TX FIFO e 384 byte RX FIFO e 7 8 or 9 data bits 1 or 2 stop bits e Automatic Hardware RTS CTS or DTR DSR Flow Control e Automatic Software Xon Xoff Flow Control e Sleep Mode for reduced power e Powered directly from USB e LEDs for Power TX and RX e ESD protection diodes on RS232
15. ut 30 seconds of idle time See Figure 5 USB UART USB232 Converter User Guide 1 7 1 7 5 RS232 Transceiver The SP3244E 3245E or MAX3243 is a 3 driver 5 receiver device These devices use an internal high efficiency charge pump power supply that requires only 0 luF capacitors for 3 3V single supply operation This charge pump and Sipex s driver architecture allow the SP3244E 3245E to deliver compliant RS 232 performance from a 5VDC power supply The Auto On line Plus feature shutdown allows the device to automatically enter a low power shutdown mode if all receiver and driver inputs have been idle for 30 seconds The device will wake up from this automatic shutdown state upon detecting activity This power saving feature functions without system intervention or modifications to software or drivers SP3244E supports serial data rates of 250kbps minimum under full load and while maintaining slew rates of less than 30V us SP3245E is capable of high speed communication of up to 1Mbps ESD protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly The driver output and receiver inputs of the SP3244E 3245E have extra protection against static electricity Sipex uses state of the art structures to protect these pins against ESD of 15kV without damage The ESD structures withstand high ESD in all states normal operation shutdown and powered down Afte
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