Data Terminal Ready: Difference between revisions

Revision as of 21:56, 23 November 2009

Revision as of 22:00, 23 November 2009

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When DTR is used for flow control, this is to manage data from the printer to the computer. However, because during printing, the bulk of the data is from the computer to the printer, the importance of flow control in the opposite direction is minimal.

==AsUsed usedas ona serialpower micepin==

On serialsome mice,hardware the DTR line (along with RTS) is typically used to provide power. to theThe most notable example of this is a serial mouse. The [[DE-9]] serial port on the PC does not provide any power pins. The mouse driver holds the DTR and RTS lines high at all times so that the mouse may steal power for its own use.

Another category of devices commonly powered by the DTR line includes converters between RS-232 and other serial standards such as [[RS-422]] and [[RS-485]].

==References==