The AC7 is a stand-alone adapter card that converts RS-232 serial communication to RS-422 serial communication, which is directly compatible with the Optomux family of intelligent brain boards. Power Requirements (Optical Isolation Mode): 200mA at +5 VDC, 50 mA at +12 VDC, 50 mA at -12 VDC; Voltage Tolerace: +/- 0.1 VDC. Power Requirements (Non-Isolated Mode): 200 mA at +12 VDC VDC 5, 0 mA at -12 VDC; Voltage Tolerace: +/- 0.1. Operating temperature Range: 0 Degree C to 70 Degree C, 0 to 95 percent Humidity (non-condensing). Isolation: 4,000 VAC (RS-232 to RS-422). RS-232 Interface: 25-pin, DB-25 female connector. RS-422/485 Interface: Screw terminals. Baud Rate: Up to 38,400 baud (Boards earlier than Rev.1 are limited to 19,200 baud). RS-232 Distance: Up to 50 feet. RS-422/485 Distance: Up to 5,000 feet. Communications: RS-422 full duplex over two twisted pairs and a signal common. Shielded cable recommended. Does not support RS-485 2-wire mode (see AC7A/B). Indicators: Transmit, Receive.