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I have found that the Sabertooth software doesn't work with ROS. Just do a direct Serial.write instead. You'll lose the nice, similar number placement, but it will work. 1-127 is motor1, 128-255 is motor 2. Check out https://github.com/avirtuos/ros_hercules/blob/master/src/hercules/arduino/hercules_rosserial/hercules_rosserial.ino

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