The ATC-107 is a series of a bi-directional interface converters. Models atc-107 optically isolate and convert unbalanced, full or halfduplex RS-232 signals to optically isolated, balanced, full or halfduplex RS-422 or RS-485 signals at baud rates up to 115,2 kbps. These units also surge suppress the RS-422/458 lines. They feature Send Data Control circuitry so no software control of handshake lines is required in RS-485 mode. ATC-107 has build-in isolators for high voltage (2500V) protection it provides point-to-point, multidrop and simplex operations. The ATC-107 can be powered from the DC 9V, 200mA power adapter, one slide switches are used to configure it's operation mode.