User Guide

Mode 2: R/C Input
R/C input mode is used with a standard hobby Radio control transmitter and receiver, or a
microcontroller using the same protocol. R/C mode is selected by setting switch 1 to the DOWN
position and switch 2 to the UP position. If running from a receiver, it is necessary to obtain one
or more servo pigtails and hook them up according to figure 5.1. If using a receiver pack, do not
connect power to the 5V line of the Sabertooth because the maximum voltage it can tolerate is
6V.
Figure 5.1: R/C connection
There are three operating options for R/C mode. These are selected with switches 4, 5 and 6.
Switch 4: Mixed Mode
When Switch 4 is in the UP position, Mixed mode is
selected. In this mode, the R/C signal fed to the S1 input
controls the forward/backwards motion of the vehicle. This
is usually connected to the throttle channel of a pistol grip
transmitter, or the elevator channel of a dual stick
transmitter. The R/C signal fed to the S2 input controls the
turning of the vehicle.
When switch 4 is in the DOWN position, Independent mode is selected. In this mode, the signal
fed to the S1 input directly controls Motor 1 (M1A and M1B) and the signal fed to S2 controls
Motor 2.
Switch 5: Exponential response
If switch 5 is in the UP position, the response is linear.
If switch 5 is in the DOWN position, the response to input
signals will be exponential. This softens control around the
zero speed point, which is useful for control of vehicles
with fast top speeds or fast max turning rates.
R/C Mixed or Independent
Exponential mode enabled