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3. Pin Assignment and Description
The ME542 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
ME542. 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 for each rising or falling edge (set by inside jumper J1);
PUL+(+5V)
4-5V when 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 J1). For reliable response, pulse
PUL-(PUL)
width should be longer than 1.5μs. Series connect resistors for
current-limiting when +12V or +24V used.
DIR signal: In single-pulse mode, this signal has low/high voltage levels,
DIR+(+5V)
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-(DIR)
DIR signal should be ahead of PUL signal by 5μs at least. 4-5V when
DIR-HIGH, 0-0.5V when DIR-LOW.
Enable signal: This signal is used for enabling/disabling the driver. High
ENA+(+5V)
level (NPN control signal, PNP and Differential control signals are on the
contrary, namely Low level for enabling.) for enabling the driver and low
ENA-(ENA)
level for disabling the driver. Usually left UNCONNECTED (ENABLED).
Selecting Active Edge or Active Level and Control Signal Mode
There are two jumpers J1 and J2 inside the ME542 specifically for the purpose of 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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ME542 Economical Microstepping Driver Manual V1.0
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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)
3
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(e) Positions of J1 and J2
Figure 2: J1 and J2 jumpers
Connector P2 Configurations
Pin Function
Gnd
DC power ground
DC power supply, 20~50VDC, Including voltage fluctuation and EMF
+V
voltage.
A+, A-
Motor Phase A
B+,B-
Motor Phase B
4. Control Signal Connector (P1) Interface
The ME542 can accept differential and single-ended inputs (including open-collector and PNP
output). The ME542 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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ME542 Economical Microstepping Driver Manual V1.0
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