DMD870 Digital Stepper Drive User’s Manual
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4.
CONTROL SIGNAL CONNECTOR (P1) INTERFACE
DMD870 stepper drive accepts differential and single-ended inputs (including open-
collector and PNP output). It has 3 optically isolated logic inputs, which are located on
connector P1 to accept line Drive control signals. These inputs are isolated to minimize or
eliminate electrical noises coupled onto the drive control signals. Recommend use line
Drive control signals to increase noise immunity of the Drive in interference environments.
In the following figures, connections to open-collector and PNP signals are illustrated.
Figure 1: Connections to open-collector signal (common-anode)
Figure 2: Connection to PNP signal (common-cathode)