System for recognizing bidirectional communication over parralle

Details System for recognizing bidirectional communication over parralle System for recognizing bidirectional communication over parralle

1997-06-27

2000-01-11

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral configuration

710 8, 710 12, 710 31, G06F 1310, G06F 1338, G06F 312

Patent

active

060147164

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.

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