RDC6445G/S Control System manual
SHENZHEN RUIDA TECHNOLOGY
6.1 Brief
The input signal end of step-servo motor driver employs the light-coupled isolation
technology. For the step-by-step impulse signal, some isolate the side OC diode from cutoff to
conduction (e.g. the valid falling edge of pulse signal inputted from the diode minus end) and
some do so from conduction to cutoff (e.g. the valid rising edge of pulse signal inputted from the
When it is indicated whether the pulse signal of motor driver is the valid rising edge or the
valid falling edge, it will be subject to the pulse signal inputted from the minus end of side OC
Some input signals of motor driver are independent and some are internally of common
anode, so some have 4 external leading-out wires and some 3 wires (only the pulse and
directional signals are counted) as shown in Figure 6.1-1 and 6.1-2.
RDC644XG Controller has four groups of 3-wires motion driver interface, each interface has
one direction signal, one pulse signal, and one 5V positive output, the direction signal and the
pulse signal are all OC output.
RDC644XG controller must be common anode with the motor driver. The polarity of the
direction signal can be changed in the factory parameters, and the valid edge of the pulse
signal can also be changed.
Figure: 6.1-1 Four Inputs, Independent
Figure: 6.1-2 Three Inputs, Common-anode
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