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3. Pin Assignment and Description
The M325 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 of the
M325. More detailed descriptions of the pins and related issues are presented in section 4, 5, 9.
Connector P1 Configurations
Pin Function
Pulse signal: In single pulse (pulse/direction) mode, this input represents pulse
signal, active at each rising or falling edge (set by inside jumper J1); 4-5V when
PUL-HIGH, 0-0.5V when PUL-LOW. In double pulse mode (pulse/pulse) , this
PUL
input represents clockwise (CW) pulse，active at high level or low level (set by
inside jumper J1). For reliable response, pulse width should be longer than 5.0μs.
Series connect resistors for current-limiting when +12V or +24V used.
Direction signal: In single-pulse mode, this signal has low/high voltage levels,
representing two directions of motor rotation; in double-pulse mode (set by inside
jumper J2), this signal is counter-clock (CCW) pulse，active at high level or low
level (set by inside jumper J1). For reliable motion response, DIR signal should
DIR
be ahead of PUL signal by 5μs at least. 4-5V when DIR-HIGH, 0-0.5V when
DIR-LOW. Please note that motion 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.
OPTO
Opto-coupler power supply, and the typical voltage is +5V.
Enable signal: This signal is used for enabling/disabling driver. High level for
ENA
enabling driver and low level for disabling driver. Usually left unconnected
(enabled).
Select Active Edge or Active Level and Control Signal Mode
There are two jumpers J1 and J2 inside the M325 specifically for selecting active edge or active level
and control signal mode, as shown in figure 2. Default setting is PUL/DIR mode and upward-rising
edge active.
(a) J1, J2 open circuit
PUL/DIR mode and active at upward-rising edge
(c)J1 open circuit, J2 short circuit
CW/CCW mode and active
at high level (The fixed level)
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M325 Micro Microstepping Driver Manual V2.0
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(b) J1 short circuit, J2 open circuit
PUL/DIR mode and active at downward-falling edge
(d) J1, J2short circuit
CW/CCW mode and active
at low level (The fixed level)
Figure 2: J1 and J2 jumpers
3
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Connector P2 Configurations
Pin Function
Gnd
DC power ground
DC power supply, 12~24VDC, Including voltage fluctuation and EMF
+V
voltage.
A+, A-
Motor Phase A
B+, B-
Motor Phase B
4. Control Signal Connector (P1) Interface
The M325 uses opto-couplers to increase noise immunity and interface flexibility. If the
opto-couplers' supply voltage is higher than +5V, a current-limiting resistor needs to be connected
at each input signal to prevent overheating the opto-couplers. In the following figures,
connections to open-collector and difference controller are illustrated.
Figure 3: Connections to open-collector signal (common-anode)
Figure 4: Connections to difference control signal
5. Connecting the Motor
The M325 driver can drive any 2-pahse and 4-pahse hybrid stepping motors.
Connections to 4-lead Motors
4 lead motors are the least flexible but easiest to wire. Speed and torque will depend on winding
inductance. In setting the driver output current, multiply the specified phase current by 1.4 to
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M325 Micro Microstepping Driver Manual V2.0
Details
4
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