(C) 2007 Web Site: www.parallax.com Office: (916) 624-8333 Forums: forums.parallax.com Fax: (916) 624-8003 Sales: sales parallax.com Sales: (888) 512-1024 Technical: support parallax.com Tech Support: (888) 997-8267 USB2SER ( 28024) FTDI FT232RQ USB to Serial Development Tool The USB2SER provides an easy way to interface a PC to a microcontroller. It bridges the PCs USB port to logic-level RX and TX signals that can connect directly to a microcontrollers I/O pins. To the PC, the USB2SER appears as a virtual COM port. To the microcontroller, the USB2SER appears as a true 5 V serial connection consisting of a RX signal, a TX signal, and a low-pulsing RESET signal controlled by DTR. This product will require a USB A to Mini B cable to be able to connect to a PC. This part can be purchased from www.parallax.com, part 805-00006. Features Key Specifications y Powered via the USB cable, no external y Power requirements: 5 VDC, up to supply required 90 mA, from USB connection y 4-pin SIP female .1 spacing connector y Communication: Full speed USB, full to microcontroller circuit duplex 5 V non-inverted TTL serial from 300 baud to 3 Mbaud y Red and blue LEDs indicate TX and RX activity y Operating Temperature: -40 to +85C y Supports standard baud rates and y Module Dimensions given in the custom rates, 300 baud to 3 Mbaud diagrams below Mini USB 1.250 (31.75mm 0.290 (7.37mm) 0.850 (21.60mm) 0.100 0.473 (2.54mm) (12.01mm) Side View Top View Bottom View Device Connection FTDI Virtual Com Port USB Drivers Required Before connecting the USB2SER tool to your computer, install the correct FTDI VCP USB drivers for your operating system. A driver installer for Windows 2K/XP/Vista is available from a home page link at www.parallax.com. It is also bundled into the newest versions of the Parallaxs BASIC Stamp Editor, Propeller Tool, and SX-Key Editor software. To obtain FTDI VCP USB drivers for other operating systems, visit www.ftdichip.com. Copyright Parallax Inc. USB2SER ( 28024) v2.0 11/24/2008 Page 1 of 2 B RevCheck Polarity Be sure to verify the correct polarity before connecting the USB2SER to another board by matching the connection names located above the connector. Programming a BASIC Stamp from a USB Port The USB2SER is not able to program BASIC Stamps. BASIC Stamp modules require an inverted signal. If you need to program a BASIC Stamp, use the Parallax USB to Serial (RS-232) Adapter ( 28030). Bill of Materials You can build your own USB2SER adapter from the Bill of Materials and schematic shown below. Description Quantity FT232RQ Chip 1 2N3904 transistor 1 Red LED 1 Blue LED 1 4.7 F capacitor 1 0.1 F capacitor 1 10 nF capacitor 1 150 resistor 4 33 k resistor 1 USB mini B connector 1 4 pin SIP socket 1 Module Schematic Copyright Parallax Inc. USB2SER ( 28024) v2.0 11/24/2008 Page 2 of 2