DM503 Fully Digital Stepper Drive Manual V1.0
3
3. Pin Assignment and Description
The DM503 has two connectors, connector P1 for control signals connections, and connector P2 for power and motor
connections. The following tables are brief descriptions of the two connectors. More detailed descriptions of the pins
and related issues are presented in section 4, 5, 9.
Connector P1 Configurations
Pin Function
Details
PUL+
Pulse signal: In single pulse (pulse/direction) mode, this input represents pulse signal, each
rising or falling edge active (set by inside jumper J3); 5-24V when PUL-HIGH, 0-0.5V when
PUL-LOW. In CCW mode (set by inside jumper J1), this input represents clockwise (CW)
pulse. For reliable response, pulse width should be longer than 2.5μs.
PUL-
DIR+
DIR signal: In single-pulse mode, this signal has low/high voltage levels, representing two
directions of motor rotation; in CW/CCW mode (set by inside jumper J1), this signal is
counter-clock (CCW) pulse. For reliable motion response, DIR signal should be ahead of PUL
signal by 5μs at least. 5-24V when DIR-HIGH, 0-0.5V when DIR-LOW. Please note that
rotation direction is also related to motor-driver wiring match. Exchanging the connection of
two wires for a coil to the driver will reverse motion direction.
DIR-
ENA+
Enable signal: This signal is used for enabling/disabling the driver. High level (NPN control
signal, PNP and differential control signals are on the contrary, namely low level for enabling.)
for enabling the driver and low level for disabling the driver. Usually left UNCONNECTED
(ENABLED).
ENA-
Selecting Active Pulse Edge or Active Level and Control Signal Mode
There are two jumpers J1 and J3 inside the DM503 specifically for selecting active pulse edge or effective level and
control signal mode, as shown in figure 2. Default setting is PUL/DIR mode and upward-rising edge active.
(Note: J2
inside the driver is used to reverse the default rotation direction.)
(a) J1, J3 open circuit (b) J1 open circuit, J3 shirt circuit
PUL/DIR mode and Active at rising edge (NPN) PUL/DIR mode and active at falling edge (NPN)
(c) J1 short circuit, J3 open circuit (d) J1, J3 short circuit
CW/CCW mode CW/CCW mode
Figure 2: J1 and J3 jumper Settings
