The four-axis SDM-20640 attaches directly to the 96-pin DIN connector of the controller without any need for a cable. For two-axis applications, the SDM-20620 is available. The compact, 6.92 x 5.10 in. SDM-20640 includes four microstepping drives on a single board, with each amplifier able to drive a two-phase bipolar stepper motor operating at 18 to 60 Vdc at up to 3.5 A. The drives also produce 64 microsteps per full step or 256 steps per full cycle, resulting in 12,800 steps per revolution for a standard 200-step motor. The maximum step rate generated by the controller is 3 million microsteps per second. The SDM-20640 features four user-selectable current settings: .5, 1, 2, and 3.5 A; a user-selectable low-current mode that reduces current power by 75 percent when the motor is at a stop; and eight uncommitted analog inputs with 12-bit Adc (16-bit optional), which allows inputs from joysticks or other analog sensors to be read by the DMC-21x3 motion controller. A four-axis SDM-20640 is priced at $395 in 100 unit quantities. When combined with a DMC-2143 four-axis controller that sells for $795 in 100 unit quantities, the combined amplifier and controller price comes to less than $300 per axis. Since the SDM-20640 attaches directly to the DMC-2143, there is no additional cabling or interconnect hardware required.

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