Pololu Simple - Manual (Page 33)

Simple Motor Controller 18v7 serial connections.
Simple High-Power Motor Controller 18v15 or 24v12 serial connections.
Simple High-Power Motor Controller 18v25 or 24v23 serial connections.
Serial Connections Overview
The pins along the left side of the Simple Motor Controller can be used to communicate with devices with logic-level
(TTL) serial interfaces, such as microcontrollers. As explained in
Section 4.1 , the Simple Motor Controller uses 3.3V
logic, but all of the digital pins in the above diagrams (everything except for VIN and GND) are 5V-tolerant, which
means that the Simple Motor Controller can be used directly with a microcontroller running at 5 V as long as that
microcontroller is guaranteed to read a 3.3 V signal as high.
The Simple Motor Controller uses its RX and TX pins to receive and transmit asynchronous, logic-level (TTL), non-
inverted serial signals with 8-bit characters and one stop bit (often expressed as 8-N-1). This is the type of serial
typically used by microcontroller UART modules.
Pololu Simple Motor Controller User's Guide © 2001–2014 Pololu Corporation
4. Connecting Your Motor Controller Page 33 of 101