954 Datasheet by Adafruit Industries LLC

USB to TTL Serial Cable - Debug / Console
Cable for Raspberry Pi
PRODUCT ID: 954
Description
The cable is easiest way ever to connect to your microcontroller/Raspberry Pi/WiFi router serial console
port. Inside the big USB plug is a USB<->Serial conversion chip and at the end of the 36" cable are four
wire - red power, black ground, white RX into USB port, and green TX out of the USB port. The power pin
provides the 5V @ 500mA direct from the USB port and the RX/TX pins are 3.3V level for interfacing
with the most common 3.3V logic level chipsets.
Because of the separated pin plugs, this cable is ideal for powering and connecting up to the debug/login
console on the Raspberry Pi or BeagleBone Black. Connect the pins as shown to power the Pi or BBB and
establish the RX/TX link.
Also handy for hacking WiFi routers to install alternate OS's, or nearly any other 3.3V logic serial port.
This is easier to use than an FTDI cable in many cases because the wires are separated. Note that we call
this a "TTL cable" (since that's what they're called) but technically it's CMOS logic.
This cable is not good for Arduino re-programming such as a Boarduino, MENTA, Monochron, etc.
because it does not have the DTR/RTS wire necessary for initiating the bootloader reboot sequence. For
that we suggest an FTDI cable or FTDI friend.
Technical Details
There are four wires: red power, black ground, white RX into USB port, and green TX out of the USB port.
The power pin provides the 5V @ 500mA direct from the USB port and the RX/TX pins are 3.3V level for
interfacing with the most common 3.3V logic level chipsets.
o If you are running Windows 7/8/10 etc, check this tutorial page with links to drivers for both
PL2303 and CP2102 https://learn.adafruit.com/adafruits-raspberry-pi-lesson-5-using-a-console-cable/software-
installation-windows
o If you are running Mac OS X, check this tutorial page with links to drivers for both PL2303 and
CP2012 https://learn.adafruit.com/adafruits-raspberry-pi-lesson-5-using-a-console-cable/software-installation-mac
o If you are running Linux, drivers are already included in the kernel, no need to install anything!
o PL2303HX.D datasheet https://cdn-shop.adafruit.com/datasheets/PL2303HX.pdf
o PL2303TA datasheet https://cdn-shop.adafruit.com/datasheets/DS_PL2303TA_d20120504.pdf
o CP210X Serial Communication Guide http://www.silabs.com/documents/public/application-notes/an197.pdf
o SiLabs CP210X product pages http://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-
vcp-drivers
Revision History
o Prior to July 1 2014 this cable would come with a PL2303HX chipset and a black USB body.
After July 1, 2014 we changed to a violet body and the PL2303TA chipset. The new 'TA cables
are Win8 compatible, and are more reliable especially when dealing with random USB-
disconnects.
o As of Dec. 21, 2016 we will be shipping cables with SiLabs CP2012 chipset instead of Prolific.
SiLabs chips seem to have better driver stability, and can handle very high speeds and 'unusual'
non-standard baud rates. Other than the driver installation, the cables perform identically.
o
EngineeredinNYCAdafruit®https://www.adafruit.com/product/95441417