The MSST5-S stepper motor driver from Astrosyn International Technology is different because it offers three modes of control: step-and-direction; internal oscillator speed control; and full-blown PC or PLC software control.

Software control allows it to be set up for running pre-coded routines repeatably, but it can also be useful to use this PC control to carry out on-line optimisation of parameters such as acceleration and deceleration rates, speeds, and wait times.

The 256 microstep MSST5-S also incorporates features such as automatic system status monitoring and display, anti-resonance, torque ripple smoothing and command signal smoothing. At start up, the driver measures motor parameters, including resistance and inductance, and uses this information to optimise system performance.

Output current is 0.2-5A (peak) from a supply voltage of 24-48Vdc. Host connection is via RS232 or RS485 interfaces. Size is 92x76x29mm.