Teletype Terminal The teletype terminal model is a serial teletype (TTY) terminal model. The main features of the model are as follows:   Fully bi-directional - received serial data is displayed as ASCII characters whilst key presses are transmitted as serial ASCII data.   Simple two wire serial data interface: RXD for received data and TXD for transmitted data.   Simple two wire hardware handshake interface: RTS for ready-to-send and CTS for clear-to-send.   Baud rate from 300 TO 57,600 baud.   7 or 8 data bits.   Odd, even or no parity.   0, 1 or 2 stop bits.   XON/XOFF software handshaking in addition to hardware handshaking. Virtual Terminal connected to an 8051 microprocessor. The output shown here has been slowed down.