User`s manual

AX3500 Motor Controller User’s Manual 73
Pulse Timing Information
Note: When attempting to supply power from the AX3500 to a standard or heavy duty
servo, the current will surge every time the servo attempts to move will cause the control-
ler to reset.
When connecting the AX3500 to other Roboteq slave controllers, care must be taken that
the 5V outputs that is present on the Master’s RC Output connector, and on the 5V output
of the Slave connectors (pin 14), are not physically connected to one another. Otherwise,
when a controller is powered On, it will be supplying 5V, and thus be powering other con-
trollers. This will stress and possibly damage the DC/DC converter of the powering control-
ler. The figures below show two alternate ways to make this connection depending
whether Optical Isolation is desired or not.
A more detailed description of the AX3500 RC Input and Optical Isolation circuit can be
found at “R/C Input Circuit Description” on page 115.
Pulse Timing Information
The RC Output port sends 8 pulses of programmable width ranging from 1ms to 2ms at
minimum and maximum position, respectively. Figure 46 shows the pulse’s waveform at
various command values. An RC Servo will be centered and a Slave Controller will be Off
when the pulse it at half width (1.5ms).
A pulse is output on each channel sequentially as show in Figure 47. As a result, the pulse
train repeat every 8ms (if all pulses are 1ms wide) to 16ms (if all pulses are 2ms wide)
1
8
9
15
To RC Outputs of
Master AX3500
Input connector o
f
Slave Controller
FIGURE 43. AX3500 to Slave Controller Connection without Optical Isolation
FIGURE 44. AX3500 to Slave Controller Connection with Optical Isolation
1
8
9
15
Input connector o
f
Slave Controller
To RC Outputs of
Master AX3500