История изменений

http://www.tldp.org/HOWTO/Text-Terminal-HOWTO-11.html#ss11.7

http://www.tldp.org/HOWTO/Text-Terminal-HOWTO-11.html

http://www.tldp.org/HOWTO/Text-Terminal-HOWTO.html#toc11.7

http://www.tldp.org/HOWTO/Text-Terminal-HOWTO.html#toc11.7

Connecting up DTR or DTR/DSR Flow Control

Some terminals use only DTR flow control. This is only one-way flow control to keep the terminal from being overrun. It doesn't protect the computer from someone typing too fast for the computer to handle it. In a standard file-transfer serial cable the DTR pin at the terminal is connected to the DSR pin at the computer. But Linux doesn't support DTR/DSR flow control (although drivers for some multiport boards may support DTR/DSR flow control.) A way around this problem is to simply wire the DTR pin at the terminal to connect to the CTS pin at the computer and set RTS/CTS flow control (stty crtscts). The fact that it's only one way will not affect anything so long as the host doesn't get overwhelmed by your typing speed and drop RTS in a vain attempt to lock your keyboard. See Keyboard Lock. For DTR/DSR flow control (if your terminal supports this two-way flow control) you do the above. But you also connect the DSR pin at the terminal to the RTS pin at the computer. Then you are protected if you type too fast.