EPT 232R-US-R1 1 Meter USB to Serial Cable User Manual
Contents
1. standard baud rate is required simply pass the required baud rate value to the driver as normal Page 4 User Manual EPT USB To Serial 1 Meter Cable and the FTDI driver will calculate the required divisor and set the baud rate See FTDI application note AN232B 05 for more details The EPT 232R US R1 cable is limited to a maximum of 1 Mbaud because of the line driver within the circuit 3 Installation 3 1 RS232 Connection Pin Out DCD RXD TXD DTR GND DSR RTS CTS RI Figure 3 1 RS232 DB9 Pin Out DB9 Pin No Name Type Description 1 DCD Input Data Carrier Detect control input 2 RXDATA Input Receive Asynchronous Data input 3 TXDATA Output Transmit Asynchronous Data output 4 DTR Output Data Terminal Ready control output Handshake signal 5 GND GND Device groud supply pin 6 DSR Input Data Set Ready control input Handshake signal 7 RTS Output Request To Send Control Output Handshake signal 8 CTS Input Clear to Send Control input Handshake signal 9 RI Input Ring Indicator control input When remote wakeup is enabled in the FT232RL s internal EEPROM taking RI low can be used to resume the PC USB host controller from suspend Page 5 User Manual EPT USB To Serial 1 Meter Cable 4 Electrical Details USB_VCC Input Power 4 25 5 0 5 25 V Present when USB Voltage cable is attached and USB Host or Hub powered Icc USB Curre2. 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 e Increase the separation between the equipment and receiver e Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help 6 2 Safety The EPT 232R US RI is defined as Limited Power Supply LPS device with operating voltages under 60VDC 6 3 Environmental The EPT 232R US RI is a lead free device that complies with the following environmental directives ROHS WEEE REACH PFOS and DecaBDE 6 4 Reliability The EPT 232R US R1 is designed as a robust USB Serial adapter for use in many environments There are no user serviceable parts Any failure will require a replacement of the unit Page 7 User Manual EPT USB To Serial 1 Meter Cable 7 Troubleshooting 7 1 Hardware Cables are the most common sources of trouble with external devices Check the following USB cable is properly inserted Computer power is ON Computer is not in Sleep or Standby Ifa USB Hub is used be sure it is set for Self Powered operation Ifa USB Hub is used be sure all cables are properly inserted RS232 cables check the following Output signals TXD RTS DTR are connected to the respective inputs RXD CTS DSR in each direc
3. NTER 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 RS232 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 RS232 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 FTDI 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 Page 9
4. User Manual EPT USB To Serial 1 Meter Cable EPT 232R US R1 1 Meter USB to Serial Cable User Manual an 1 EPT 232R US R1 1 Meter USB to Serial Cable The EPT 232R US R1 provides a simple method of adapting legacy serial devices with RS232 interfaces to modern USB ports Each EPT 232R US RI1 adapter contains a small internal electronic circuit board which utilises the FTDI FT232R mounted inside a rugged plastic enclosure capable of withstanding industrial temperature ranges The integrated electronics also include RS232 level shifters and TXD RXD LEDs to provide a visual indication of data traffic through the adapter The Cable incorporates a standard USB A device connector for connection to an upstream host or hub port RS232 level signals including modem handshake signals are available on an industry standard DB9 Male connector The maximum RS232 level data rate is 1MBaud Page 1 User Manual EPT USB To Serial 1 Meter Cable The EPT 232R US RI adapter cable requires USB device drivers available from www earthpeopletechnology com resources driver which are used to make the EPT 232R US R1 appear as a Virtual COM Port VCP This allows existing serial communications software such as HyperSerialPort to exchange data through the US232R to a legacy RS232 peripheral device 1 1 Block Diagram USB A FTDI FT232R USB Serial RS232 Level Shifter DBS Male Connector Bridge Connector USB A Connector This connector provide
5. er reduced to 15mA and the suspend current has been reduced to around 70u A This allows greater margin for peripheral designs to meet the USB suspend current limit of 500pA 2 3 Low USB Bandwidth Consumption The operation of the USB interface to the FT232R has been designed to use as little as possible of the total USB bandwidth available from the USB host controller 2 4 Improved EMI Performance The reduced operating current and improved on chip VCC decoupling significantly improves the ease of PCB design requirements in order to meet FCC CE and other EMI related specifications 2 5 Programmable Receive Buffer Timeout The receive buffer timeout is used to flush remaining data from the receive buffer This time defaults to 16ms but is programmable over USB in Ims increments from Ims to 255ms thus allowing the device to be optimised for protocols that require fast response times from short data packets 2 6 Baud Rates The FT232R supports all standard baud rates and non standard baud rates from 300 Baud up to 3 Mbaud Achievable non standard baud rates are calculated as follows Baud Rate 3000000 n x where n can be any integer between 2 and 16 384 214 and x can be a sub integer of the value 0 0 125 0 25 0 375 0 5 0 625 0 75 or 0 875 When n 1 x 0 i e baud rate divisors with values between 1 and 2 are not possible This gives achievable baud rates in the range 183 1 baud to 3 000 000 baud When a non
6. hanged to any available COM port number including COM1 to COM4 to support HyperSerialPort or any other serial communications software application running in Windows e FIFO 128 byte transmit buffer 256 byte receive buffer e RS 232 data signals TxD RxD RTS CTS DSR DTR DCD RI GND e Powered by USB port No external power adapter required e Serial Communication Parameters O O O O Parity None Even Odd Data bits 7 8 Flow control RTS CTS DSR DTR X ON X OFF None Stop bits 1 2 e Operating temperature of 20 C to 80 C 1 3 Performance Figures Parameter Performance USB Interface 12Mbps USB 2 0 Full Speed RS232 Interface Standard Windows baud rates 300bps to 921 6Kbps Custom baud rates 300bps to 1Mbps through baud rate aliasing Page 3 User Manual EPT USB To Serial 1 Meter Cable 2 EPT 232R US R1 Key Features This section summarises the key features and enhancements of the FT232R IC device which is used on the EPT 232R US R1 USB to RS232 converter cable For further details consult the FT232R datasheet which is available from the FTDI website 2 1 Pre programmed EEPROM The FT232R is supplied with its internal EEPROM pre programmed with a serial number which is unique to each individual device This in most cases will remove the need to program the device EEPROM 2 2 Lower Operating and Suspend Current The device operating supply current has been furth
7. nt 30 50 mA Table 4 1 USB Electrical Details Vtrans Transmitter 5 V RL 3KQ output voltage swing Vrec Receiver 2 4 25 Vv Input resistance 3KQ input voltage to 7KQ range ESD HBM 15 kV RS 232 Inputs and Outputs Table 4 2 RS232 5 Physical Environment Details T Operating 20 80 C 5 to 95 RH non Temperature condensing Range 6 Environmental Approvals amp Declarations 6 1 EMI Compatibility FCC and CE The EPT 232R US RI has been tested to be compliant with both FCC Part 15 Subpart B and European EMC Directive Page 6 User Manual EPT USB To Serial 1 Meter Cable 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 C 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
8. s the interface for connection to a USB Host or Hub port Cable The EPT 232R US RI cable is available in length 1 meter FTDI FT232R The FTDI FT232R chip provides the USB to Serial conversion Operating system device drivers are required in order to work with the FT232R to provide the Virtual COM Port serial functionality RS232 Level Shifter The RS232 level shifter converts the signals provided by the FT232R into the voltage levels required by RS232 devices DB9 Connector Male The DB9 Male connector is configured in an industry standard TIA EIA 574 pin out to provide connection to RS232 peripherals through standard cables 1 2 Cable Features Page 2 User Manual EPT USB To Serial 1 Meter Cable e Adds one RS 232 serial port by connecting to USB e Special high gloss white finish enclosure design e Side lit blue RXD and TXD traffic indicators e Enhanced RS232 transceiver gives serial port speed of up to 1MBaud e Gold plated USB and DB9 connectors for enhanced connection reliability e Integral 100cm USB cable with moulded strain relief e Quality 4 layer PCB design e Easy plug amp play installation and RS 232 device connection e Works with USB 1 1 amp 2 0 Host and Hub ports e Industry Standard FTDI chip set amp device drivers for maximum compatibility e Microsoft Windows WHQL certified Mac OS X Linux and Windows CE device drivers e Installs as a standard Windows COM port e COM port number can be c
9. tion Check for specific handshake requirements of your RS232 peripheral Ifhandshake signals are not used ensure the application is set to No Hardware Handshake or equivalent Test the port with a loop back connector Connect TXD to RXD RTS to CTS and DTR to DSR Use HyperSerialPort to check that data is transmitted and received 7 2 Device Driver Ensure the latest device driver is in use See www earthpeopletechnology com resources drivers 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 e DEVICE TIMES OUT The default settings of the device driver assume typical data transfers of hundred 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 drivers buffer size and or latency timer to smaller 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 Ims will cause unnecessary USB traffic and could adversely affect data transmission Page 8 User Manual EPT USB To Serial 1 Meter Cable ERRATIC MOUSE POI
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