JPH03214228A - Control system for serial printer - Google Patents

Abstract

PURPOSE:To print the new data before the data remaining in a reception buffer memory are printed by providing a reset-only command and clearing immediately the reception buffer memory at the reception of the command and simultaneously discontinuing the printing operation. CONSTITUTION:When the data are received, a CPU 11 performs the discrimination processing 1 to discriminate whether the received data are equal to a reset command or not. If so, the reset processing 2 is carried out and a reception buffer memory 13 is stopped in regard of its clearing and printing operations in preference to the processing of the data storing in the memory 13. If not, the received data are stored in the memory 13 and the normal processing is carried out. In this case, the action programs stored in a ROM 12 are used. In such a constitution, the new data can be printed before the data remaining in the memory 13 are printed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control system for a serial printer, and in particular to a serial printer that stores a large amount of received data in a reception buffer memory and sequentially reads and prints the received data. Regarding the control method.

[Conventional technology]

A conventional serial printer stores a large amount of data received from a host computer in a reception buffer, reads the data sequentially, performs a printing operation, and continues printing until there is no more data in the reception buffer.

[Problem to be solved by the invention]

As mentioned above, in conventional serial printers, even if data transmission from the host computer is stopped in order to interrupt the printing operation, the data remains in the printer's reception buffer and printing of that data is completed. Since the printer continues printing until
The drawback is that it is very inconvenient when you want to cancel the current printing and print another text.

Some printers can be stopped by operating the operation panel, or have a function to put the printer in the day select state and stop receiving data by a command from the host computer. There is nothing that can stop the printer and clear the buffer.

[Means to solve the problem]

The control method for a serial printer of the present invention includes a processing unit that receives and processes commands from a host computer, a read-only memory that stores a program for operating the processing unit, and a reception buffer memory that stores received data. In a control method for a serial printer that has a function, before storing received data in the reception buffer, it is determined whether the received data is a reset command to reset the printer and clear the buffer, and if it is a reset command, the printer is stopped. This includes giving priority to processing to clear the contents of the buffer over other processing.

〔Example〕 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart 1 showing an embodiment of the present invention, and FIG. 2 is a block diagram of an example of an apparatus to which the embodiment of FIG. 1 is applied.

As shown in FIG. 1 and FIG. 2, when data is received, the CPU II performs determination processing 1 to determine whether or not the received data is a reset command. If it is a reset command, perform reset processing 2 and store reception buffer memory 1.
The receiving buffer memory 13 is cleared and the printing operation is stopped with priority over the processing of data stored in the memory 3.

When the received data is not a reset command, the data is stored in the reception buffer memory 13 and normal processing is performed. These operating programs use programs stored in the ROM 12.

〔Effect of the invention〕

As explained above, the control method for the serial printer of the present invention provides a special reset-only command separately from other commands, and immediately clears the reception buffer memory and stops the printing operation when that command is received. This has the advantage that the operation of printing new data without waiting for the completion of printing of the data remaining in the reception buffer memory can be easily realized by a command from the host computer.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing one embodiment of the present invention, and FIG.
The figure is a block diagram of an example of an apparatus to which the embodiment of FIG. 1 is applied. 1...Discrimination processing, 2...Reset processing, 11...
CPU, 12...R, OM, 13... Reception buffer memory.

Claims (1)

[Claims] In a control method for a serial printer, the serial printer has a processing unit that receives and processes commands from a host computer, a read-only memory that stores a program for operating the processing unit, and a reception buffer memory that stores received data. Before storing the received data in the reception buffer, it is determined whether the received data is a reset command to reset the printer and clear the buffer, and if it is a reset command, the printer is stopped and the contents of the buffer are cleared. A control method for a serial printer characterized by including performing processing with priority over other processing.