C. usb-to-serial app, Overview, Installation instructions – Pololu Wixel User Manual
Page 37: Pinout, Description, Section 9.c
Wixel programmable USB wireless
module (fully assembled) with USB cable
connected.
9.c. USB-to-Serial App
Overview
This app allows you to turn a Wixel into a USB-to-TTL serial
adapter capable of baud rates up to 350,000 bps. While this app does
not use the radio, it has more features than the USB-to-UART mode
of the Wireless Serial App (see
Installation Instructions
Download the
(13k wxl). Open it with the
Wixel Configuration Utility and write it to a Wixel. See
for more information on how this is done.
Pinout
Pin
Function
P1_0 DTR general purpose output pin controlled by computer
P1_1 RTS general purpose output pin controlled by computer
P1_2 DSR general purpose input pin reported to computer
P1_3 CD
general purpose input pin reported to computer
P1_6 TX
transmits serial data from computer
P1_7 RX
receives data and sends it to the computer
Description
After you have loaded this app onto a Wixel, the Wixel will appear to the computer as Virtual COM Port (with USB
product ID 0x2200). If you are using Windows, you should see an entry labeled “Wixel” in your Device Manager
in the “Ports (COM & LPT)” category while the app is running. You can connect to this COM port using a terminal
program in order to send and receive data on the TX and RX lines. Typical terminal programs will allow you to set
the baud rate, parity type, and number of stop bits. Some terminal programs will allow you to use the control signals
(DTR, RTS, DSR, and CD). For more information, on how to use a virtual COM port, see
.
This app supports all integer baud rates between 23 and 350,000 bps.
This app supports all the different types of parity: None, Odd, Even, Mark and Space.
This app supports 1 stop bit or 2 stop bits mode.
The RX line has an internal pull-up resistor, so you can leave this line disconnected.
The DSR and CD input pins have internal pull-up resistors, so when they are disconnected they will read as high
(logical 0).
The DTR and RTS output pins are designed for high current (see the information on P1_0 and P1_1 in
).
The control signals are all inverted, which means that a logical 0 corresponds to a high voltage (3.3 V) and a logical
1 corresponds to a low voltage (0 V).
Pololu Wixel User's Guide
© 2001–2014 Pololu Corporation
9. Wixel Apps
Page 37 of 64