JPH0260781A - Printing system - Google Patents

Abstract

PURPOSE:To enhance a printing system in throughput, safety, operability by providing an asynchronous report part and an initiator function part on the side of a printer and a target function part on the side of a host computer. CONSTITUTION:With the detection of such an event as error or page printing termination in each part within a printer 11, reported information is set to a report data part 146. Succeedingly, if a state of a Small Computer System Interface(SCSI) is either a bus free phase or an arbitration phase, an asynchronous report part indicates a bus arbitration right using an arbitration part of a printer SCSI control part, and the printer SCSI control part serves as an initiator. Then, a host computer is selected as a target in a selection phase by a selection part of the printer SCSI control part. Thereafter, the information is transmitted from the printer SCSI control part to a host computer SCSI control part in an information transfer phase using the former initiator function part and the latter target function part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides SCSI (
Small Computer SS75te In
terface).

[Conventional technology]

In recent years, SCSI2>KANSI (American National Standards Institute) has been adopted as a standard interface between host computer and peripheral devices such as printing devices and magnetic disk devices in the field of personal computers and work stage technology. It is about to be defined and used.

The host computer complies with the SCSI standard (ANSIxA1
3i), it is connected to a printing device as shown in FIG. 2, for example.

In the second printing system, the host computer 10
Communication between the printer 11 and the printer 11 is performed in the following steps (see FIG. 3).

(1) In the initial state, the state of the SCSI bus 12 is in the bus free phase.

(2) Pass-free phase - Arbitrage fraud -
In the host computer 10, the host computer 10 uses the cuff-bit controller 131 to assert bus arbitration rights and becomes the initiator.

(3) In the SELEX date 7A, the host computer 10 selects the printing device 11 as a target using the SELECTION code unit 132.

(4) In the information transfer phase, primary (1) to (1)
v) move 1+11 t f? vinegar. (υ to (1)) are respectively called command 7 aids, data phase, status phase, and message phase.

(1) The host computer 10 uses the initiator function unit 135 to send one SC8I command to the printing device 11 to give instructions to the printing device 11.

Note that the SCSI command may be simply referred to as a command hereinafter. This SCSI command is executed by the target function unit 14.
5, the printing device 11 receives it.

(II) Next, data is transmitted or received using the initiator function unit 153 and the target function unit 143 depending on the type of command. Data transmission is used to transmit print data, etc., and data reception is used to receive response data from the host combination to the printing device 11 in response to an arrangement. Some commands do not send or receive data.

(III) Subsequently, the execution state of the command is returned as a status from the target function unit 143 to the initiator function unit 133.

OV) Next, the targeter function unit 143 sends a message to the initiator function unit 155 to report that the processing of the command by the target has been completed. As a result, the state of the SCSI bus 12 becomes the bus free phase again.

Repeat steps (2) to (4) below.

Note that the initiator and target are defined as follows according to the SCSI standard.

Initiator: A SCSI control unit that requests other SCSI control units to execute a command.

Googet: A SCSI controller that executes commands requested by an initiator.

In the above communication procedure, the host computer 10 instructs the printing device 11 to print characters, figures, etc. on paper by sending print and other commands and accompanying data in steps (1) and (1) of step (4). This is done by sending.

Here, when the print and other commands are stored in the command buffer unit 151, it is assumed that the trouble in the printing device 11 has ended, and the status and message are transferred from the target function unit 143 to the initiator function unit 13.
Send to 3. At this time, the contents of the status are success or failure of storing the command in the command buffer section 151.
- represents, and the message content represents the completion of the main storage process for the - command.

The original processing of the printing device 11 is performed by the command buffer section 151.
(Hereinafter, this process will be referred to as delayed command processing, and the command that is once stored in the command buffer and executed will be referred to as delayed processing command.)
However, if the above status and messages are used to indicate the end of printing of each page or an error in this delayed command processing, it is impossible to use the status or message that has already been issued.
It cannot be transmitted from L11 to host computer 10.

For the host combination - 10 units and printing device 112 scs
Vf with an interface other than x! There are two types of printing systems that attempt to report errors from a printing device to a host computer.

(a) [% System described in Japanese Patent Publication No. 1983-204386] The host computer requests the printing device to perform self-diagnosis as appropriate, and the printing device reports the results.

(b) [System described in Japanese Unexamined Patent Publication No. 62-90058] The printing device detects an error and sends it to the host computer.

[Problem to be solved by the invention]

The conventional printing system described above has the following problems to be solved.

In a printing system that uses both s and csr, in phases other than the status transmission from the target function unit 143 to the initiator J1 function unit 133, even if an event such as an error or printing end is detected in the printing device 11, the printing device There is no way to asynchronously report an emergency from the computer to the host computer. Furthermore, even if it is a friend in the status sending phase, as described above, it cannot be used to send an error detected during execution of status all delay command processing or page printing completion to the host computer. Ninth, the host computer cannot grasp the latest status of errors, printing completion, etc. in the printing device, and cannot effectively control the printing device. Furthermore, there is a problem in that the printing device cannot receive appropriate instructions based on the latest status from the host computer.

In addition, in printing devices such as print servers and shared printers where the print requester and the printing device are used in a remote location, there are risks such as errors in running out of consumables such as paper and toner, and heating of the laser beam printer fuser heater. When an error is detected by a printing device, it is necessary to report it directly to the host computer, which is not possible with the printing system.

Furthermore, in the system described in the above-mentioned Japanese Patent Application Laid-open No. 60-204386, even if an event such as completion of printing in step 2-1 occurs in the printing device, unless the host computer makes an inquiry to the printing device or requests self-diagnosis, There was a problem in that these events could not be communicated to the host computer.

Furthermore, the system described in the above-mentioned Japanese Patent Application Laid-Open No. 62-90058 provides a method for asynchronously and urgently reporting various events that occur within the printing apparatus from the printing apparatus to the host combiner, in particular using SCSI communication. There was a problem in that no consideration was given to the method of asynchronous reporting. Another problem is that only a very small number of events within the printing device, such as errors detected by the error detection unit, are communicated to the host computer, and the host computer cannot effectively control the printing device. there were.

The purpose of the present invention is to solve the problems of the above conventional system,
Various events such as errors occurring within the printing device, completion of page printing, and changes in communication status between the host computer and the printing device are urgently reported from the printing device to the host computer, thereby improving the reliability and operation of the printing system. Our goal is to provide a printing system with improved performance.

[Means to solve the problem]

The above purpose is to provide an asynchronous reporting section and an initiator function section in the SCSI control section for print control, and to
A target function section is provided in the CSI control section, and when each section in the printing device detects a report event, report data is set in the report data section, and after that, the asynchronous reporting section is started. This is achieved by setting the host computer SCSI control section as the initiator, targeting the host computer SCSI section, and then transmitting the contents of the report data section from the former to the latter as a command or extended message.

That is, the present invention provides a host computer, a printing device, and SCSI (Small) for connecting these two devices.
Computer System Interface
e) The host computer and the printing device each have a SCSI control section for the host computer and a SCSI control section for the printing device for communicating with each other, and the SCSI control section for the host computer has an arbitration function. The SCSI control unit for the printing device has an arbitration function unit, a selection function unit, and an initiation function unit, and the printing device has an arbitration function unit, a selection function unit, and an initiation function unit; In addition to the SCSI control unit,
In a printing system having a command processing section, a page buffer section, a printer control section, and a printer engine section, an initiator means is provided in a SCSI control section for a printing device, and a target means is provided in a SCSI control section for a host computer.

The SCSI control unit for the printing device is activated by the detection of various events of the printing device, and the SCSI control unit for the printing device is used as an initiator, and the SCSI control unit for the host computer is activated by the detection of various events of the printing device.
The present invention is characterized in that an asynchronous reporting means is provided which targets the CSI control unit and then controls the former to transmit a command or extended message to the latter.

The asynchronous reporting means has a report data section, and the SC! 3
The I control unit, the command processing unit, or the printer control unit must detect various events that occur in the printing device, and the content of the event must be set in the report data unit before being activated. preferable.

The printing device includes an abnormality processing means for processing various events detected in each part of the printing device, and a user panel section for displaying and inputting the status of communication between the host computer and the printing device. panel control means for controlling the
Further, it is preferable to provide a canceling means for canceling print data in the printing device.

The asynchronous reporting means has a report data section, and includes abnormality processing means, command processing means, printer control means, panel control means, cancellation processing means, and SC within the printing apparatus.
It is preferable that the content of the detected event be set in the report data section by each section of the SI control means and then activated.

Various events that cause the asynchronous reporting means to be activated include errors, completion of page printing, empty command buffers, and changes in the communicable state between the host computer and the printing device.

(9) As a means for solving the above-mentioned problems, the present invention comprises a host computer, a printing device, and a SCSI bus connecting these two devices, and the host computer and printing device each have a bus for communicating with each other. The host combination device has a Yuzuki SCSI control section and a 5C9I control section for the printing device, and the SCSI control section for the host combination device has an arbitration section, a selection section, and an initiator function section, and has a printing device SCSI control section. The device SCSI control section includes an arbitration section, a selection section, and a target function section, and the printing device has a command processing section, a page buffer section, a printer control section, and a printer engine in addition to the printing device SCSI control section. In a printing system having a copy.

a command classification unit that uses a SCSI control unit for a host computer as an initiator and a SCSI control unit for a printing device as a target, and when a command is sent from the former to the latter, classifies the command into an immediate processing command and a delayed processing command; If the command is an immediate processing command, an immediate command processing means to execute it immediately; if the command is a delayed processing command, a command buffer means to temporarily store and hold the command; and later, a command buffer means to execute the command from the command buffer means. The present invention is characterized in that a delayed command processing means for reading and executing the command is provided in the command processing unit described in RIIL, so that the host computer instructs the printing apparatus to print.

In the above aspect, preferably, the printing device SCSI control section is provided with an initiator means, the host computer SCSI control section is provided with a target means, and the printing device SCSI control section is preferably activated upon detection of various events of the printing device. and the SC for the printing device! With the 9I control unit as an initiator and the SCSI control unit for the host computer as a target, an asynchronous reporting unit is provided that controls sending a command or an extended message from the former to the latter, and reports state changes within the printing device to the printing device. Configure emergency reports from the host computer.

[Effect]

Each part within the printing device (SG!3I control section, command processing section, printer control section, etc.) is controlled by the state of VA within the printing device. When all events such as error, end of page printing, empty command buffer, change in communication status between host computer and printing device are detected, the contents of these events are immediately set in the report data section and asynchronous reporting is performed. start the department.

The asynchronous reporting unit asynchronously reports an emergency from the printing device to the host combi-controller if the SCSI bus state is bus 7 7 7 7 AZ or ARBITRARY 1 7 7 AZ n.

(1) In Bus 7 LeafAze to Arbitration Status, the arbitration section of the 5C9I control section for the printing device is used to express the bus arbitration right, and the
The CSI control unit is assumed to be the initiator.

(2) Subsequently, in the selection phase, the selection unit of the 5C9I control unit for the printing device selects the host combination Goto as a target.

(3) Next, in the information transfer phase,
(: The contents of the report data section are transmitted from the SI control section to the host computer SCSI control section using a command or an extended message using the former initiator function section and the latter target function section.

S CS I /(If the status of the bus is not bus 71J-7 AIDS, wait until it becomes bus 7 leaf AIDS and perform the above procedure.

As described above, by configuring and operating the 5csx control unit for print control and the SCSI control unit for host combinator, status change events within the printing device can be urgently reported from the printing device to the host computer, and the host computer can Since it is possible to optimally control the pressure of itself and the printing device according to the contents of the report, it is effective in improving the throughput, safety, reliability, and operability of the printing system.

〔Example〕

A first embodiment of the present invention will be described below using the configuration example shown in FIG.

This configuration example includes a host computer 10, a printing device 11, and a 5C9I bus 12. The host computer 10 and the printing device 11 each have SCSI for host computers.
It has a control section 15 and a SCSI control section 14 for printing apparatus, and by controlling these SCSI control sections 15 and 14, they communicate with each other through the SCSI bus 12.

The host combinatorial SCSI control section 15 includes an arbitration date section 151, a security section 132, and an initiator function section 153. The printing device SCSI control section 14 includes an arbitration section 141, a selection section 142, and a target function section 145.

In a conventional printing system using SCSI (shown in FIG. 2), the SCSI controller 1 for the host computer
3 and the printing device SCSI control unit 14 each had only one of the initiator function by the initiator function unit 133 and the target function by the target function unit 143.

The feature of the present invention is that a target function section 154 is provided in the SC8I control section 13 for the host computer, and
This is because the C3I control unit 14 is provided with an initiator function unit 144, an asynchronous reporting unit 145, and a report data unit 146.

The printing device [ft is the SOS f control unit 14 described above, as well as the te,
It has a command processing section 15, a page buffer section 16, a printer control section 17, and a printer engine section 18, and the 15 has a command buffer section 151 and a delayed command processing section 154 therein.

The SCSI control unit 15 for the host computer and the SCSI control unit 14 for the printing device communicate via the 5CSI bus 12.
Communication is performed as described in Prior Art Section 10.

The commands in the command buffer section 151 include pr
Some commands, such as the int command, have a subcommand string in their data section, while others do not.

Note that the subcommands are outside the scope of the SCSI standard.
In the present invention, the character code and escape 7-kunsu are used and defined for this printing system.

tx, commands, and subcommands are divided into those instructing drawing and those instructing printing, and are executed by the delayed command processing unit 154.

When you execute a command or subcommand that instructs drawing,
Characters and figures are drawn as dot images on the page buffer section 16 (bitmap memory). When a command or subcommand instructing printing is executed, the printer control unit 17 is activated. After the drawing is completed, the printer control section 17 reads the contents (dot image data) of the next page buffer section 16 and sends it to the printer engine section 18 .

The printer engine unit 18 prints on paper using an electrophotographic printing mechanism or a wire dot printing mechanism according to the input dot image data.

The delayed command processing section 154, the printer control section 17.
When an event such as an error or completion of page printing is detected in each part of the printing device, the printing device 11 reports these events to the host combination server 10 according to the procedure shown in Figure K4.

In FIG. 4, when the event is first detected, it is set in the report data section 146 (41).

The detection and setting of this event is as shown in Figure 4(e).
First, each part (command processing part, printer control part, abnormality processing part, tunnel control part, cancellation processing part, etc.) in the printing apparatus detects the report contents (411).

Next, the report contents are set in the report data section (412).
.

Subsequently, an asynchronous report 42't- is carried out, and if the state of the SCSI bus is pass-free phase 9 arbitration 7A (42-a), a report 1 (43) is carried out. Report 1 states that (1) to (5) in “Action 10” above.
Perform the processing described as . That is, at j:5 shown in FIG. 4(b), the arbitration section of the SCSI control section for the printing device is used to assert the bus arbitration right in (11 path free 7 phases to arbitrage phase), and the mark 1i11J is
Set the device SCSI control unit as an initiator (451)
.

(2) Next, in the selection phase, the host computer is selected as a target by the selection section of the printing device SCSI control section (432). (3) Then, in the information transfer phase 7, the printing device The contents of the report data section are transmitted from the SCSI control section to the host computer SCSI control section using a command or an extended message using the former's initiator function section and the latter's target function section (433).

In the information transfer phase of 435, in this embodiment, the 5end command uses an extended message.

The C0PY command may be used instead of the 5end command.

If the SCSI bus is in the information transfer phase (42-b),
Report 2 (44) sends the contents of the report data section to the host computer using an extended message (see FIG. 4(o)).

If the SCSI bus is in any other phase (42-C)
, waits for the SCSI bus status to become bus 7 leaf aids according to report 3 (45) (451), and reports 1 (43) for bus free all rows 5 (see FIG. 4(d)).

Note that even in the information transfer phase of 42-b, report 2
Report instead of (44)! The procedure (45) may also be used.

Note that in the above embodiment, the initiator function section (1
44 and 133) and target function section (154 and 143)
are constructed as shown in FIGS. 5(a) and 5(b), respectively.

Initiator function section 153 or 1 shown in FIG. 5(a)
44, 51, 52, and 53 are used by the initiator to send commands, data, and messages, respectively. Also, 54, 55 and 56 are used for rounding when the initiator receives data, status, and messages.

Further, in the target function unit 134 or 143 shown in FIG. 5(b)K, 57, 58, and 59 are respectively used for the ninth point where the target receives commands, data, and messages. Also, 5A.

5B and 5C are used by the target to send data, status, and messages.

Each part in FIG. 1 is a microprocessor and a RAM.

ROM, LSI, logic IC, electrophotographic printing mechanism,
This can be achieved using a wire dot printing mechanism or the like.

According to this embodiment, status change events within the printing device can be urgently reported from the printing device to the host computer, and the host computer can optimally control itself and the printing device according to the contents of the report. throughput,
Safety, reliability, and operability can be improved.

Next, a second embodiment of the present invention will be described using the configuration example shown in FIG.

FIG. 6 shows the printing apparatus of the first embodiment shown in FIG. 1 to which an abnormality processing section 61, a panel control section 62, an error state table section 63, and a cancellation processing section 64 are added.

The abnormality processing unit 61 is activated using the error number as an input parameter when error 2- is detected in each part of the printing apparatus 11. This abnormality processing section 61 causes errors that occur in each section of the printing apparatus (5C9I control section 14, command processing section 15, delayed command processing section 154, printer control section 17, printer engine section 18, panel control section 62, and others). can be commonly processed.

A panel control 62 is provided to control the man-machine interface between the printing device and the user. The function of 62 is to display and input the communicable state between the host computer 10 and the printing device 11 (hereinafter abbreviated as host-printer communication state). Here, the communication status between the host and printer is communication possible (online) and communication impossible (offline).
and hold (user intervention request) t-provision.

The hold state corresponds to errors such as out of paper and out of toner, which can be returned to a normal state by the user's intervention in the printing device. In this state, the host computer must not send the delay processing command to the printing device. The printing device will ignore it even if it is sent. In this state, the only commands that can be sent from the host computer to the printing apparatuses are immediate processing commands, which will be described later.

The cancellation processing unit 64 is provided at the ninth point where cancellation processing (clearing all buffer data in the printing device) is performed. The cancellation processing instruction is performed either by sending a 5top Pr1nt command from the host computer to the printing device, or by inputting it from the user panel.

Further, the error status table section 63 has a configuration in which (a) error codes, (b) interruption/resume/cancellation flags, and (c) communication status between host and printer are arranged in this order. Error #r9 detected in each part within the printing apparatus 10 is included in (a). (b) For VC, enter all execution modes of the abnormality processing unit 61. Writing to (o) is performed by the abnormality processing unit 61, panel control unit 62, etc.
) while referring to the contents of SC! 3I control section 1
Operate 4.

In the configuration shown in FIG. 6 above, the state change shown in the seventh factor is detected in each part of the printing apparatus 11. In 41 of the reporting procedure shown in FIG. 4, for these various detections,
As shown in FIG. 4(e), detection 412 by 411
is set in the report data section 146 by.

In this embodiment, it is used for asynchronous reporting from the printing device fi 11 to the host computer 10. Data formats for commands and extended messages are shown in Figures fJca to Figure 11. Figure 8 shows (a) CD B (Command Descri) for the S@nd command.
(b) Report data format of the transfer data section of the 5end command.

(Q) Report content code shows.

Of these, the report content code (0) is defined to roughly classify the content of the report data (b).

If this code is 1, the host combination Todoroki reads out the page count, the current number of copies printed, and the total number of copies printed in the report data, and specifies the page that has been printed. This code is 2
In this case, the host combiner reads out the set of error class and error code in the report data as the error number, and specifies the content of the error. If this code is 7, the host computer reads the page number and the number of remaining print copies in the report data as the retransmission start page position. Here, the remaining number of copies to be printed is a value obtained by subtracting the current number of copies to be printed from the total number of copies to be printed for each page.

Furthermore, in the single print system, the print end page is managed using the following three parameters.

■Page through page (host combination is delayed processing command Control Pr1ter (see Figure 13))
■Current number of copies printed for each page (takes a value from 1 to the total number of copies printed.) ■Total number of copies printed for each page Figure 9 shows (a) CDB for the Cop7 command.
and (b) indicates the report data format. Further, FIG. 10 shows an extended message format in which the various events shown in FIG. 7 are collectively reported by the extended message. If the report content code is 1 (page printing completion report), set the page through page, the current number of copies printed, and the total number of copies printed, and report. If the report content code is 7 (retransmission start page position report), set the page positive and the number of remaining print copies and report. FIG. 11 shows an extended message format for reporting these events individually. Either the method shown in FIG. 10 or FIG. 11 may be used as the extended message.

In addition, four asynchronous methods (■5end command, ■C
If you implement any one of the following: op7 command, ■-Extended messages for collective reporting, ■Extended messages for individual reports), you can achieve the following asynchronous reporting functions? :Can do 1 boat.

According to this embodiment, all the various events that occur in each part of the printing apparatus 11 can be reported to the host computer 10, so that the host computer can take all the appropriate actions shown in FIG. 7 in response to various events. This can eliminate unnecessary procedures. Furthermore, since abnormality processing is performed in a unified manner in one place, the capacity of the abnormality processing program can be reduced and its reliability can be improved.

Next, a fifth embodiment of the present invention will be described using the configuration example shown in FIG. 12.

In the example shown in FIG. 12, a command classification section 152 and an immediate command processing section 155fc are provided in the command processing section 15 of the first embodiment shown in FIG.
A drawing command processing section 154 & and a printing command processing section 154 b 1 & are provided in the drawing command processing section 54 .

The command division unit 152 divides the SCSI command sent from the host combinator 10 to the printing device 11 into immediate processing commands and delayed processing commands.

The former is immediately executed by the immediate command processing section, and the latter is once stored in the command buffer section 151, and then the delayed command processing section 154 reads out the contents of 151 and executes it.

A laser beam printer (LP) is installed in the printer engine section 18.
The first example of the SCSI command when using ft is
Shown in Figure 3.

In Figure 15, (a) 1 command for program download, (b) 4 commands for timing, and (0
) For host combinations - 2 for urgent requests from evening to printing device
command is an immediate processing command. (8) three commands for print control, (f) one command for drawing, and (g) one command for printing are delay processing commands.

Further, (d) 1 command for emergency reporting from the printing device to the host computer is for starting the asynchronous reporting unit 145, and in this example, the 5end command is used.

In FIG. 15, only one command (d) is a command sent from the initiator function section 144 to the target function section 134, and the remaining commands are commands sent from the initiator function section 135 to the target function section 143.

Further, the print control command (e) and the drawing command (f) are executed by the drawing command processing section 154a in the command processing section 15 shown in FIG. It is executed by the command processing unit 154b.

It is also possible to abolish all the SCSI commands for print control and printing and embed them as subcommands in the data section of the Pr1nt command. For example, even if the number of delay processing commands is one Pr1nt command, the same control as in the case of FIG. 13 can be performed.

In addition, in FIG. 13, Program Load
rContinue Pr1nt a Cont
rol Pr1nter, Pr1ntOut are pender-unique S(:SI commands, and there are nine settings in the present invention.

According to this embodiment, in addition to the ninth delayed processing command that instructs the printing device to draw and print, the host computer sends an immediate processing command to the printing device to be executed in priority to the delayed processing command. This has the effect that the host computer can precisely control the printing device.

〔Effect of the invention〕

According to the present invention, a change in the state within a printing device is urgently reported from the printing device to a host computer, and the host computer can optimally control itself and the printing device according to the contents of the report. It has the effect of increasing throughput, safety, reliability, and operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a first embodiment of the printing system of the present invention, FIG. 2 is a block diagram showing the configuration of a conventional printing system, and FIG. 5 is an explanatory diagram showing the operation of the conventional printing system. , FIG. 4 is a flowchart showing the operation of the first embodiment of the present invention, FIG. 5 is a block diagram showing the functions of the initiator function section and the target function section in the first embodiment, and FIG. 6 is a printing system of the present invention. FIG. 7, FIG. 8, and FIG. 9 are block diagrams showing the configuration of the second embodiment. 10 and 11 are explanatory diagrams showing the operation of the second embodiment, respectively, FIG. 12 is a block diagram showing the configuration of the fifth embodiment of the printing system of the present invention, and FIG. 15 is the third embodiment of the invention. It is an explanatory diagram showing the effect of. 10... host computer, 11... printing device,
12... SCSI bus, 13... SCSI control unit for host computer, 14... SCSI control unit for printing device, 15... command processing unit, 16... page buffer unit, 17... printer Control unit, 18... Printer engine unit, 151... Arbitration unit,
152... Selector function part, 155... Initiator function part, 134... Target function part, 141...
・Arbitrage 1st part, 142... Selexy part.

Claims (1)

[Claims] 1. A host computer, a printing device, and a SCSI (Small Computer System) that connects these two devices.
system interface) bus, the host computer and the printing device each have a host computer SCSI control unit and a printing device SCSI control unit for communicating with each other, and the host computer SC
The SI control section includes an arbitration section, a selection section, and an initiator function section; the SCSI control section for a printing device includes an arbitration section, a selection section, and a target function section; In a printing system that has a command processing section, a page buffer section, a printer control section, and a printer engine section in addition to the SCSI control section, an initiator means is provided in the SCSI control section for the printing device, and the SC for the host computer
The SI control unit is provided with a target means, and the SCSI control unit for the printing apparatus is activated by detection of various events of the printing apparatus, and the SCSI control unit for the printing apparatus is used as an initiator, and the SCSI control unit for the host computer is activated by the detection of various events of the printing apparatus.
A printing system comprising an asynchronous reporting means that targets a CSI control unit and then controls the former to transmit a command or an extended message to the latter. 2. The asynchronous reporting means has a report data section, and the SC
Claim: The printer is activated after any of the SI control unit, command processing unit, and printer control unit detects various events that occur in the printing device, and the content of the event is set in the report data unit. 1. The printing system described in 1. 3. Controls an abnormality processing means for processing various events detected in each part of the printing apparatus, and a user panel section for displaying and inputting the status of communication between the host computer and the printing apparatus, within the printing apparatus. a panel control means for canceling print data in the printing device; and a canceling device for canceling print data in the printing device; Printer control means, panel control means, cancellation processing means, SC
5. The printing system according to claim 4, wherein the printing system is activated after the content of the detected event is set in the report data section by each section of the SI control means. 4. The printing system according to claim 1, 2 or 3, wherein the various events include an error, completion of page printing, empty command buffer, and change in communicable state between the host computer and the printing device. 5. Consists of a host computer, a printing device, and an SCSI bus that connects these two devices.
The SCSI control unit for a printing device has a control unit, the SCSI control unit for a host computer has an arbitration unit, a selection unit, and an initiator function unit, and the SCSI control unit for a printing device has an arbitration unit, a selection unit, and a target function unit; In addition to the SCSI control section for the printing device, the printing device has a command processing section, a page buffer section, a printer control section, and a printer engine section. command classification means for classifying commands into immediate processing commands and delayed processing commands when a command is sent from the former to the latter, and immediate command processing for immediately executing the command if the command is an immediate processing command. If the command is a delayed processing command, a command buffer means for temporarily storing and holding the command, and a delayed command processing means for later reading and executing the command from the command buffer means are included in the command processing section. A printing system comprising: a host computer instructing a printing device to print. 6. An initiator means is provided in the SCSI control section for the printing device, and a target means is provided in the SCSI control section for the host computer, and the SCSI control section for the printing device is activated by the detection of various events of the printing device to perform the printing. The SCSI controller for the device is used as an initiator, and the SCSI controller for the host computer
A claim that targets a CSI control unit and then provides an asynchronous reporting means for controlling the sending of commands or extended messages from the former to the latter, so that state changes within the printing apparatus can be urgently reported from the printing apparatus to the host computer. The printing system according to item 5.