User Manual

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 there are only motor drivers
being used it is acceptable to power the receiver directly from a SyRen as shown. If the system
also has to power servos or other 5v loads, we recommend a ParkBEC or a receiver battery pack,
as shown in figure 5.2. If using a receiver pack, do not connect power to the 5V line of the
SyRen because the maximum voltage it can tolerate is 6V.
Figure 5.1: R/C connection Figure 5.2: R/C with a ParkBEC
There are two operating modes for R/C. These are selected with switch 5.
Option 1: Standard R/C mode
A standard R/C pulse is fed into S1. A 1500us pulse is zero
speed, a 1000 us pulse is full reverse and a 2000 us pulse is
full forward. Because different transmitter manufacturers
use different default pulse widths, if it seems like you are
not getting full power, it may be necessary to increase the
transmitter’s ATV to 120%.
Option 2: R/C Auto-Calibrate Mode
R/C Auto-Calibrate mode is used to interface to R/C
systems that do not use 1500us as their center point.
Examples are pistol-style transmitters with a “70/30”
throttle and airplane style throttles where a single-direction
control is desired. In R/C auto-calibrate mode, the position
the control stick is when the driver is powered up is taken
as the neutral point. During operation, the driver will detect the minimum and maximum control
inputs, and use those to set the control range. If the driver is initialized with the control stick at
either extreme, the driver will operate in single-direction mode.
Standard R/C Mode
R/C Auto-Calibrate Mode