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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 PC’s USB port to
logic-level RX and TX signals that can connect directly to a microcontroller’s 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
Powered via the USB cable, no external
supply required
4-pin SIP female .1" spacing connector
to microcontroller circuit
Red and blue LEDs indicate TX and RX
activity
Supports standard baud rates and
custom rates, 300 baud to 3 Mbaud
Key Specifications
Power requirements: 5 VDC, up to
90 mA, from USB connection
Communication: Full speed USB, full
duplex 5 V non-inverted TTL serial from
300 baud to 3 Mbaud
Operating Temperature: -40 to +85°C
Module Dimensions given in the
diagrams below
Mini USB
(C)
2007
0.290”
(7.37mm)
0.850”
(21.60mm)
0.473”
(12.01mm)
1.250”
(31.75mm
0.100”
(2.54mm)
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 Parallax’s 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
Rev
B
Check 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
FT232RQ Chip
2N3904 transistor
Red LED
Blue LED
4.7 µF capacitor
0.1 µF capacitor
10 nF capacitor
150
Ω
resistor
33 kΩ resistor
USB mini B connector
4 pin SIP socket
Quantity
1
1
1
1
1
1
1
4
1
1
1
Module Schematic
Copyright © Parallax Inc.
USB2SER (#28024)
v2.0 11/24/2008 Page 2 of 2
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