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It is recommended to mount the driver vertically to maximize heat sink area. Use forced cooling
method to cool the system if necessary.
3. Pin Assignment and Description
The M752 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
Pulse signal: In single pulse (pulse/direction) mode, this input represents pulse
signal, each rising or falling edge active (set by inside jumper J3); 4-5V when
PUL+
PUL-HIGH, 0-0.5V when PUL-LOW. In double pulse mode (pulse/pulse) ,
this input represents clockwise (CW) pulse，active at high level or low level
(set by inside jumper J3). For reliable response, pulse width should be longer
PUL-
than 1.5μs. Series connect resistors for current-limiting when +12V or +24V
used. The same as DIR and ENA signals.
DIR signal: In single-pulse mode, this signal has low/high voltage levels,
representing two directions of motor rotation; in double-pulse mode (set by
DIR+
inside jumper J1), this signal is counter-clock (CCW) pulse，active at high
level or low level (set by inside jumper J3). For reliable motion response, DIR
signal should be ahead of PUL signal by 5μs at least. 4-5V 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
DIR-
to the driver will reverse motion direction. The default rotation direction can be
reverse by inside jumper J2.
Enable signal: This signal is used for enabling/disabling the driver. High level
ENA+
(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
ENA-
disabling the driver. Usually left UNCONNECTED (ENABLED).
Selecting Active Pulse Edge or Active Level and Control Signal Mode
There are two jumpers J1 and J3 inside the M752 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
rising edge active (NPN, and PNP control signal is on the contrary).
J2 inside the driver is used to reverse the default rotation direction. 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.
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M752 Microstepping Driver Manual V1.0
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(a) J1, J3 open circuit
PUL/DIR mode and Active at rising edge (NPN)
(c) J1 short circuit, J3 open circuit
CW/CCW mode and active
at low level (The fixed level)
Figure 2: J1 and J3 jumpers
Connector P2 Configurations
Pin Function
+V
Power supply, 20~75 VDC, Including voltage fluctuation and EMF voltage.
GND
Power Ground.
A+, A-
Motor Phase A
B+, B-
Motor Phase B
4. Control Signal Connector (P1) Interface
The M752 can accept differential and single-ended inputs (including open-collector and PNP output).
The M752 has 3 optically isolated logic inputs which are located on connector P1 to accept line
driver control signals. These inputs are isolated to minimize or eliminate electrical noises coupled
onto the drive control signals. Recommend use line driver control signals to increase noise immunity
of the driver in interference environments. In the following figures, connections to open-collector and
PNP signals are illustrated.
Figure 3: Connections to open-collector signal (common-anode)
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M752 Microstepping Driver Manual V1.0
(b) J1 open circuit, J3 shirt circuit
PUL/DIR mode and active at falling edge (NPN)
(d) J1, J3short circuit
CW/CCW mode and active
at high level (The fixed level)
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