49
Two-, and Three-Channel Stepper Motor Controller
A.1.1 Digital/User Outputs
All digital outputs are of the open-collector type, with a 330 Ohm series resistor. When
the output is set to a logic zero (which is also the default state), it behaves as open
circuit. When it is a logic one, it behaves as a 330 Ohm resistor connected to ground.
Fig. A.2 Digital Output Schematic
In some applications, the outputs may be required to control external equipment that
has optocoupler type inputs (such as PL Cs). The digital outputs used h ere can be
used to directly drive most optocouplers and the +5V supply available on pins 14 and
15 can be used to provide power for the optocouplers.
Fig. A.3 Application Example: Connection to Optocoupler Inputs
These outputs can also b e used to i nterface to external logic circuitry (a pu ll-up
resistor may be needed if the external logic does not contain it) or control other types
of inputs.
Please see the LLSetGetDigOPs method in the APTServer helpfile for details on how
to control these logic IO.
Caution
The voltage that external equipment applies to the digital outputs must be
within the range 0 V and +5 V DC, or damage to the outputs may occur.
Output
330R
0V
330R
gnd
+5V
Optocoupler
