For simple servo applications, QuickSilver offers the SilverDust IGF which features a compact DIN rail mountable design, 7 TTL level I/O (optional 24V with QCI-BO-B52), RS-232/485 serial interface, ASCII/Modbus protocol, and enough memory for several thousand lines of programming. Like the other SilverDust IG controller/drivers, the IGF comes with a built in regenerative braking circuit, single connector to motor, an on/off switch, and status LEDs.