Instruction Manual

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Table 1 CN2 connector pinout
Pin # Name I/O Description Function
1 Direction I Motor rotation direction control Low=CW
High=CCW
2 Enable I Motor enable/disable Low=disable,
High=enable
3 Clock input I Clock signal supplied to the board Controls MDL speed
4 HMTR O Home position sensor trigger Low=not triggered
High= triggered
5 FETR O Far end position sensor trigger Low=not triggered
High= triggered
6 Clock output O Clock pulse applied to the motor Output level: TTL
7 +5V O Positive 5V power output Output current limit
50mA
8 Ground - System ground
B) P1: Potentiometer for motor drive voltage adjustment
The motor drive voltage can be adjusted using potentiometer P1. For a motor working in
constant current mode, motor output torque is not very sensitive to changes in drive
voltage. The voltage is factory preset to 10.5V. In most cases, it is not necessary to
change the setting. The voltage range is from 2V to input power voltage minus 1.5V.
C) P2: Potentiometer for motor drive current adjustment
The average motor drive current can be adjusted to fit different load torques using
potentiometer P2. Potentiometer P2 adjusts both motor phase currents evenly. The
current adjustment range is from 0.05A to 1A. Larger currents can provide larger motor
output torques. The current is factory preset to match the requirements of the MDL-003
stepper motor. If the board is being used with an MDL-003, it is not necessary to change
the current setting.
D) CN1: Power supply connector
Type: Power jack
Inner conductor: Diameter 1.3mm, Positive
Outer conductor: Diameter 3.8mm, Negative
Figure 3 Power jack configuration
Document # GP-IN-MDL-003-CONTROLB-12 Page 6 of 13