Jymc220bi Schematic [2021] Full May 2026

| Pin | Name | Function | |-----|--------|------------------------------| | 1 | EN | Enable (active low) | | 2 | MS1 | Microstep config bit 1 | | 3 | MS2 | Microstep config bit 2 | | 4 | VDD | Logic supply (3.3-5V) | | 5 | GND | Logic ground | | 6 | STEP | Step input | | 7 | DIR | Direction | | 8 | DIAG | Diagnostic output | | 9 | VM | Motor power (12-24V) | | 10 | GND | Power ground | | 11 | A1/A+ | Motor coil A | | 12 | A2/A- | Motor coil A return | | 13 | B1/B+ | Motor coil B | | 14 | B2/B- | Motor coil B return | | 15 | VREF | Current reference (analog) | | 16 | TX/RX | UART data (optional) |