T e c h S P e cs SM5090A-R2: top: rear view; bottom: front view Compliance — FCC Part 15 Class A, DOC Class/MDC classe A Interface — RS-232, full-duplex, asynchronous Protocol — Asynchronous Code Set — ASCII Data Format — 7 or 8 data bits with even, odd, or no parity (user-selectable); 1 stop bit (fixed) Flow Control — Hardware (DTR/CTS) or software (X-ON/X-OFF), user-selectable Operation — Full-duplex Data Rate — 19,200, 9600, 4800, 2400, 1200, 600, 300, or 110 bps, user-selectable Maximum Distance — 50