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7 pin mini-DIN female (key in the center) connector layout
7 pin mini-DIN female (key in the center) connector
at the top, under the cover plate
Pin
Number		 Pin
Name		 Description
1 Vpwr Roomba battery + (unregulated)
2
3 RXD 0 – 5V Serial input to Roomba
4 TXD 0 – 5V Serial output from Roomba
5 DD Device Detect input (active low) – used to wake up Roomba from sleep 
6 GND Roomba battery ground
7

The RXD, TXD, and Device Detect pins use 0 – 5V logic, so a level shifter such as a MAX232 chip will be needed to communicate with a Roomba from a PC, which uses rs232 levels.

Pinout status: +1 -0
According to 1 reports in our database (1 positive and 0 negative) the Roomba external serial port pinout should be correct.

Is this pinout
NO DIY devices
Roomba external serial port visual pinout:click to enlarge
Source(s) of this and additional information: http://www.robotappstore.com/files/KB/Roomba/Roomba_SCI_Spec_Manual.pdf
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