This adapter allows BCD input Hecon printers to be used with the new indicators that have serial output 20 ma or RS232C. Input is 25 pin connector. Enclosure is same size as standard Hecon connector for 522 or 516. Setup switches give 4 baud rates, 7 or 8 data bits, 4 parity modes, 1 or 2 stop bits, normal/inverted data, local/remote print control, four input formats.