half.duplex
A terminal mode which displays and sends a keystroke.
Description
describes communications in a single direction at a time.
One side sends and the other side receives. When the roles reverse; the sending side now receives and the receiving side now sends.
On 'ASCII' terminals used with the Pick system, 'half duplex' is the mode in which characters entered from a keyboard are displayed on the terminal screen and simultaneously transmitted to the Pick host.
Normally, Pick ports are configured for 'full duplex' also called 'echo-plex'. Every character received is 'echoed' to the terminal. The system expects the terminal to also be in 'full duplex'. If a terminal is inadvertently set to 'half duplex', each character is displayed twice for each keystroke.
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