Parallel port for connecting multiple devices and the method for controlling the same
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United States of America Patent
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-
Oct 31, 2000
Grant Date -
N/A
app pub date -
Apr 30, 1998
filing date -
Oct 13, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of controlling a parallel port for connecting multiple devices is disclosed. The method controls the connection between a computer and one of the peripheral devices by way of using the different on-line codes corresponding to the peripheral devices respectively. Further, a common off-line code is set and shared by all peripheral devices. When the off-line code is sent out, all peripheral devices are disconnected from the computer, and the control status of the previous on-line device is backed up for the use of recovering the previous on-line state. Furthermore, a parallel port for connecting multiple devices is also proposed to incorporate with the controlling method such that the computer can switch the on-line state between an on-line peripheral device and the other peripheral standby devices.
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