System for recognizing bidirectional communication over parrallel data lines by further sending data transmission request and notification indicating reverse direction transmission is possible to second device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 11, 2000
Grant Date -
N/A
app pub date -
Jun 27, 1997
filing date -
Jul 1, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bidirectional communication method, bidirectional communication device and storage medium for automatically setting the communication mode without complications to the user and not causing the malfunctioning of the computer system and the printer are disclosed. The control register of the personal computer is used to set data reception from the laser printer in a byte mode. A specific data is written to the data register, and the value of the data register is read. If the value of the data register is not the specific data, it is recognized that the personal computer can be set to the byte mode. If, on the other hand, the read value of the data register is the specific data, another specific data is written to the data register, then the value of the data register is read, and if the value of the data register is another specific data, it is recognized that the personal computer cannot be set to the byte mode.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully