BV101-4 FT232BM RS232 MAX232 - Datasheet Archive

 

Product Specification USB Serial Interface BV101-4 BV101-4 USB Serial Interface Product specification ©ByVac ©ByVac

 

ByVac Product Specification USB Serial Interface BV101-4 BV101-4 BV101-4 BV101-4 USB Serial Interface Product specification ©ByVac ©ByVac 2006 May 2008 Page 1 of 4 ByVac Product Specification USB Serial Interface BV101-4 BV101-4 Contents 1. Introduction.3 2. Specification .3 3. Serial Connection .3 4. Software Drivers .3 5. Using .4 May 2008 2 of 4 www.byvac.co.uk ByVac Product Specification USB Serial Interface BV101-4 BV101-4 Figure 1 Serial Connection 1. Introduction This is a USB to serial converter that is primarily designed for the BV system but could be used for any USB ­ serial application. The output is TTL 5V logic levels. Figure 1 shows the input / output available from the two, five way sockets and also from the five way row of connectors at the bottom of the board. Pin 1, marked on the board is RTS. Up to 100mA can be taken from the USB via an on board low drop out voltage regulator. This regulator also provided short circuit protection to the USB host system. The two by five way sockets are connected together and form a convenient way of connecting two IASI devices. The board utilises the FT232BM FT232BM chip and free drivers are available from www.ftdichip.com The Virtual COM port (VCP) driver should be used. There are three output connectors on the board, two are duplicated for connecting multiple IASI devices and the third provides the control signals, DTR, RST, etc. This third connector is supplied with the 5 way pinhead connector but without it soldered in place giving the user maximum flexibility. 2. Specification o Input ­ USB type B o PCB ­ Surface mount. o On board voltage regulator with short circuit protection o 3 connection socketed. o Dimensions overall 21mm x 13mm High o Weight 4g options, 2 3. Serial Connection ©ByVac 31 x x All signals are positive logic, meaning that +5V is logic 1 and 0V is logic 0. The device is capable of supplying up to 100mA to external equipment. 4. Software Drivers The USB, FTDI Chip was chosen for this device because it has drivers for most operating systems and is freely available. The driver required is for the VCP (Virtual Com Port). The following describes the windows installation, the FTDI site has comprehensive installation instructions for other operating systems. 1) The first thing to do is to obtain the VCP drivers from FTDI. The web site is www.ftdichip.com and the page for the drivers was: http://www.ftdichip.com/FTDriv ers.htm 2) Unzip the file to a suitable directory, c:\temp if you like. 3) Connect the BV101-4 BV101-4. The PC should react with new hardware found. At this stage choose the option that allows you to select the location of the drivers, and show windows the c:\temp directory. Windows will eventually tell you that the driver has been successfully installed. Don't delete c:\temp just yet as experience has shown Windows always asks at least twice for the location of the drivers. Page 3 of 4 ByVac Product Specification USB Serial Interface BV101-4 BV101-4 4) The driver will install a new COM port on your system. The easiest way to discover what this port is, is to use BV Terminal 2. This will have a new entry in the COM port drop down list. As an alternative look in the device manager. In Windows XP this is Control Panel, System, Hardware tab and Device manager. 5. Using The BV101-4 BV101-4 although primarily designed for use with the IASI series of boards can be used with any device that requires RS232 RS232 communication. There is no voltage translation of course so if you do need + and ­ 12V you will need to add a transceiver chip such as the MAX232 MAX232. The 5 way connector is a DOUBLE 5 way with the pins connected in parallel. Pin 3 of the 5 way connector can provide up to 100mA to supply power to an external device. The 5 way connector sockets have the following pins pin 5-5 GND power pin 4-4 n/c pin 3-3 +5V power pin 2-2 RXD input pin 1-1 TXD output Pin 1 is at the bottom of the board with the USB socket to the left. The 5 way connector to the bottom of the board have the following pins. pin pin pin pin pin 1 2 3 4 5 ©ByVac RTS CTS DTR DSR DCD output input output input input Page 4 of 4