JPS60141574A - Serial printer controlling system - Google Patents

Abstract

PURPOSE:To enable the period of time required for program processing to be shortened, by independently subjecting each of a device-controlling part and an interface-controlling part having a character buffer to micro-program control. CONSTITUTION:The device-controlling part is provided as a micro-program controlling circuit consisting of a micro-processer unit 4, a ROM7 storing operating programs for a printer and a RAM9, which are connected to each other by a system bus 11, and the part controls the drive of motor and magnet drivers 12, 13. On the other hand, the interface-controlling part is provided as a micro-program controlling circuit consisting of a micro-processor unit 1, a ROM6 and a RAM8, which are connected to each other by a system bus 10. Transfer of information between the controlling parts is effected through I/O ports 2, 3, which are connected to each other by a both-direction bus line 5, and the transfer of information is effectively conducted by a character buffer. Accordingly, the period of time required for the program processing can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a control system for a rotary printing type serial printer having a print wheel in which a large number of characters are arranged on the circumference.

(Prior Art) Conventionally, serial printers have been controlled by microprogram control, and the first control of this microprogram control is device control of the printer mechanism. The second control is interface control between the external controller and the printer.

Magnet on/off as printer mechanism control
The control of off-state and motor rotational drive includes many controls specific to printers, and requires detailed and precise techniques. Interface control has many changing elements based on the required specifications from the external controller. For this reason, executing both device control and interface control using one microprogram has the drawbacks of increased program processing time and difficulty in responding to diversification of interface specifications.

In the present invention, a device control section that controls the printer mechanism and an interface control section that controls the interface with an external controller are provided, and both are independently microprogram controlled to facilitate control between the two. In order to achieve this, a line buffer is provided in the interface control section, which consists of a group of registers for the absolute address on the print wheel of type, print carrier position, print pressure level, and ribbon red/black.

The control of the serial printer is separated into the following two parts, each controlled by an independent microprogram. First, the device controls the motor that rotates and moves the print wheel up and down, the carriage motor that moves the print wheel and the carrier equipped with the print wheel movement motor left and right, and the microprogram control of the paper feed motor and hammer magnet. The control section is configured, and the second interface with the external controller is the micro 7'o
It constitutes an interface control section that controls the program. Inside this interface control section, there is a character buffer consisting of registers for absolute abiless on the type print wheel, print carrier position, printing pressure level, ribbon red/black, and a bidirectional pass line between the two control sections. be combined.

A number of commands are prepared for transmitting information between the interface control section and vice control section through the bidirectional path line, but in order to facilitate this command transmission, the interface control section contains absolute print addresses and print carrier positions.・It is effective to prepare a character buffer consisting of each register group for printing pressure level and ribbon red/black.

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

Referring to FIG. 1, a device control section for controlling the printer mechanism is provided with a microprogram control circuit consisting of a microprocessor unit 4, a OM7, and an AM9, each of which is a system. They are connected by bus 11. The operation program of the printer is stored in 1(,0M7), and the drive control of the motor driver 12 and the magnet driver 13 is performed by this. microprocessor unit I;
A microprogram control circuit consisting of a ROM 6 and a RAM 8 is provided, each of which is coupled by a system bus 1o. Information is transmitted between the device control section and the interface control section through I10 boats 2 and I10 boats 3. The I10 boats 2 are connected by bidirectional pass lines 5.

FIG. 2 shows a concrete example of the connection between the device control section and the interface control section, and FIG. 3 shows its timing diagram. Command information shown in FIG. 4 is transmitted via path line 24.

FIG. 5 shows the character buffer 53 provided in the interface control section. Character buffer 53 is composed of several registers. One is a register that indicates the absolute address of the type on the print wheel, and the other two are a register that indicates the print carrier position, a register that indicates the printing pressure level, and a register that indicates ribbon red/black. Usually, the line buffer 54 is composed of a plurality of character buffers. Data 51 from an external controller is temporarily stored in a reception data register 52, and then decomposed into several types of information and stored in a character buffer 53. After that, command 5 reads out the information in the character buffer and corresponds to the printer's operation.
5 and transmitted onto the bidirectional bus.

As explained above, the present invention provides device control 0-km
(interface control section) Each is controlled by an independent microprogram, and by having a character buffer in the interface control section, information is effectively transmitted between the two, making it easy to shorten program processing time and diversify interfaces. It has the effect of responding to

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
Figure 3 is a partial circuit diagram of the bidirectional pass line shown in the figure, and Fig. 3 is a time chart diagram that clarifies the operation of the bidirectional pass line.
Figure 4 is a diagram showing the command information table of the bidirectional path line.
FIG. 5 is a diagram showing the structure of a character buffer within the interface section. 1.4°°°...Microprocessor unit, 2°3...I10 board, 5...Bidirectional pass line, 6.7...ROM (read-only) memory), 8゜9...RAM (random access memory), 1ot11-゛...° system bus, 12゛゛°°° motor driver circuit, 13... magnet driver circuit, 14...Sensor circuit, 15...External interface, connector, 2
4...Pass line, 25...Control line, 26...IN MODE line, 27...
...H-8TB line, 28--L-8T13 line, 29...INPUT DY line, 51
...Data from external controller, 52...
... Reception data register, 53 ... Character buffer, 54 -=-, line buffer (character buffer group), 55 ... °゛°° command

Claims (1)

[Claims] A print wheel in which a large number of type letters are arranged on a circumference, a motor that drives the print wheel, a carriage motor that moves a carrier on which the motor is mounted left and right, a paper feed motor, a hammer pivoting magnet, and rotation contained therein. In a printing type serial printer, a device control unit that controls the motor and the magnet with a microprogram, an interface control unit that controls the interface with an external controller with a microprogram, and information between the device control unit and the external controller. Equipped with a bidirectional path line that transmits
A serial printer characterized in that an interface control unit has a character buffer consisting of registers for the absolute address of type on a print wheel, print carrier position, print pressure level, and ribbon red/black.