USB Sabertooth Packet Serial Library for Arduino
Control your USB-enabled Sabertooth with reliable Packet Serial.
2.Settings/SerialTimeout/SerialTimeout.ino

Sets a serial timeout, and then delays to demonstrate its stopping behavior.

// Set Serial Timeout Sample for USB Sabertooth Packet Serial
// Copyright (c) 2012-2013 Dimension Engineering LLC
// See license.txt for license details.
#include <USBSabertooth.h>
USBSabertooth ST(C, 128);
void setup()
{
SabertoothTXPinSerial.begin(9600);
// Set a timeout of 1500 ms here.
// A value of 0 resets the serial timeout to its default (normally, disabled).
// You can also set the serial timeout in DEScribe, available at
// http://www.dimensionengineering.com/describe
ST.setTimeout(1500);
}
void loop()
{
// Set motor 1 to reverse 400 (out of 2047), and sleep for 5 seconds.
// Notice how it cuts out after 1.5 seconds -- this is the serial timeout in action.
// Since we configured it in setup() for 1.5 second, 1.5 second without any new
// commands will cause the motors to stop.
ST.motor(1, -400);
delay(5000);
// Why do this?
// If your program crashes, or the signal wire is not working properly,
// the Sabertooth will stop receiving commands from the Arduino.
// With a timeout, your robot will stop.
//
// So, serial timeout is primarily a safety feature. That being the case,
// it's best to set the serial timeout in DEScribe if you can -- if the
// signal line is noisy when the command is sent, it may be lost. DEScribe
// settings are saved on the motor driver, eliminating that possibility.
}