JPS61246830A - Electronic typewriter - Google Patents

Abstract

PURPOSE:To attain the connection and control of communication adaptors having different specifications by providing a means recognizing which of an RS adaptor and a centro adaptor is connected and selecting a suitable communication procedure by the output of the said means. CONSTITUTION:The interphase logic circuit 12 of an electronic typewriter 20 is connected by a connector 7 to any external I/F circuit 19 of a serial adaptor (RS adaptor) outputting the serial data of the RSC 232C specifications or outputting parallel reception data in the serial data of an RS 252C specifications (centro adaptor). Since the RS adaptor gives an output while using a MODEM 2 as logical 1 and a MODEM 1 as logical 0 and the centro adaptor outputs while using the MODEMs 1, 2 as logical 0, the interface logic circuit 12 detects it and informs it to an MPU 8. The MPU 8 discriminates it and selects a suitable communication procedure.

Description

Detailed Description of the Invention E Industrial Field of Application J The present invention relates to an electronic typewriter, particularly an electronic typewriter with a reception-only function (hereinafter referred to as RO@functional electronic typewriter), which has different specifications. The present invention relates to an electronic typewriter with improved connection and control with a communication adapter.

[Summary of the Disclosure] This specification and drawings specifically describe a connection means for connecting a serial adapter that outputs serial reception data as serial data or a parallel adapter that outputs parallel reception data as serial data, especially in an electronic typewriter with an RO function. , a serial data receiving means for receiving the serial data via the connecting means, and an identification means for identifying the serial adapter and the parallel adapter, so that the serial data receiving means is common regardless of which adapter is connected. The present invention discloses technology for an electronic typewriter that can receive data.

``Prior art'' Electronic typewriters have become faster in printer parts in recent years, and the print quality is superior to that of regular serial printers, so electronic typewriters are used as dedicated printers for personal computers (PCs), etc. Its uses are increasing. An electronic typewriter with such a reception-only communication function is called a Roll Noh electronic typewriter.
The serial interface EIA-RS232C and the parallel interface Centronics (Printer interface specified by Centronics) are standard interfaces used to connect a computer and a printer.
In addition, an increasing number of devices are equipped with the Centronics standard interface. However, if both interfaces were built into the main unit, the program capacity would increase and the cost would be high, so the conventional example is R52.
There are printers that can function as Centronics by having a 32C interface as standard equipment on the main body and adding a special adapter for R5232C-Centronics conversion externally. However, RS23
Since the 2C interface is originally an interface for communication lines, D
It is specified that it is based on hardware signal lines such as TR, DSR, RTS, CTS, etc.
In addition to data flow control using F code, B I 5YNC is used as a data link transmission protocol.

There are various communication procedures such as HDLC. Therefore, when the main body has an R5232C interface and an R5232C-Centronics conversion adapter is added externally, as in the conventional case, the main body itself cannot recognize that the conversion adapter has been added, so the data There was also a problem in that the user had to set the flow control and transmission data reception procedure each time.

In addition, especially in battery-powered electronic typewriters, it is easy to consume power to convert from logic level to R5232C level, and when adding a Centronics adapter, it is necessary to convert the serial logic level to RS232C level on the main unit.
Power supply is required not only for level conversion but also for R5232C to serial logic level conversion in the external RS232C to Centronics conversion actuator, resulting in unnecessary 2
Power loss was extremely large due to heavy level conversion.

[Problem J to be Solved by the Invention This invention aims to solve the disadvantage that a user must configure flow control and reception procedures each time when receiving data via different adapters.

At the same time, the present invention aims to solve the disadvantage of extremely large power loss due to unnecessary double level conversion.

[Means for solving the problem J As a means for solving this problem, for example, an electronic typewriter (main body) 1 with an RO function according to an embodiment shown in Fig. WS1,
A serial adapter that outputs serial reception data as R5232C specification serial data (one form of the external I/F circuit 19, hereinafter referred to).

RS adapter) or parallel reception data to RS2
A connector 7 to which a parallel adapter (another form of the external I/F circuit 19, hereinafter referred to as a centro adapter) is connected, which outputs serial data of the 32C specification, and the above-mentioned through the connector 7.

RS interface logic circuit 12 that receives serial data of B5232C specifications. ! −, MODE1 and M
An identification means 81 for identifying the RS adapter and the centro adapter via the ODE 2 line is provided as a function of the microprocessor (MPU) 8.

"Operation" In the configuration shown in FIG.
Logic signals required for C, i.e. TxD/, RxD
/ , DTR/ , DSR/ , RTS/ , CT
S/, etc., and a MODE signal 1.2 for knowing whether an RS adapter or a Centro adapter is connected, and the main body 20 uses this MODE signal 1.2.
A communication procedure suitable for one of the adapters is selected based on the judgment, and in any case, data reception is performed at low cost and with low power consumption.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an external perspective view of the electronic typewriter with RO function according to the embodiment. In the electronic typewriter shown in FIG. 2, keys arranged on the keyboard 1 are operated. Alternatively, when a character code is received via the serial boat connector 7, the characters arranged on the type wheel mounted on the carriage 2, that is, the digiwheel 5, are struck from the back side by a printing hammer 6 via a printing ink ribbon, and then placed on the platen 3. Printing is performed on the printing paper 4 of .

FIG. 1 is a block diagram of the electronic typewriter with RO function shown in FIG. 2. In the configuration shown in FIG. , a random access memory (RAM) 10 for temporarily storing received data, etc.;
A common data bus 15 connects the printer interface logic circuit 11, RS interface logic circuit 12, and keyboard 14, and further uses the address bus 16 and R/W line 17 to execute microinstructions and exchange data. It is configured so that it can be done. With this configuration, ROM9 or RAM
According to the microinstructions programmed in the MPU 13, the MPU 13 performs sequential calculation control and code control.
When T is sent, the above-mentioned programmed interrupt processing is requested to the MPU 8 at the same time.

It interrupts the data bus 15 and outputs microcoded key information necessary for processing. Printer interface logic 11 receives and latches coded drive information regarding various printing devices via data bus 15;
The printer drive control circuit 13 , which delivers the signal to the printer drive control circuit 13 , amplifies the received drive signal to a level capable of driving various printer drive devices 18 .

Next, the RS interface logic circuit 12 operates in an asynchronous manner according to the data specifications such as data length, odd-even parity, number of stop bits, etc. and baud rate specifications set via the data bus 15.

In the transmitting section, the data is converted from parallel to serial and sent to Tx.
D/, and is simultaneously sent to the external adapter along with control signals such as DTR/ and RTS/.

Conversely, the receiving section similarly performs serial-parallel conversion on the data RxD/, converts input signals such as DSR/, CTS/, MODEI, 2, etc. into microcodes and sends them to the MPU 8 via the data bus 15.

FIG. 3 shows the electronic typewriter 20 of the embodiment using RS232C.
FIG. 2 is a system configuration diagram of an electronic typewriter 20 and an RS adapter 21 when used as a dedicated printer on a line 2. FIG. 4 is a system configuration diagram of the electronic typewriter 20 and the Centro adapter 22 when the electronic typewriter 20 is used as a dedicated printer in the Centronics Entachi 3. Also, signal lines TxD/, RxD/, DT
R/, DS R/, RTS/, CTS/, MO
Connection frame 1 consisting of DEL, MODE 2, etc. is the main body-RS
This is common between the adapter and main body-centro adapter.

! ! FIG. 85 is an internal circuit configuration diagram of the RS adapter 21, and the data and D of TxD/ and RxD/ on FIG.
TR/, DSR/, RTS/, CTS/ signals at logic level (e.g. OV, 5V) or I”+RS232
The driver and receiver circuit element that converts the level to C level (=l=10V) and the MODE1 signal indicating that an external adapter is installed are LL level and then RS/Centro as an external adapter. A signal MODE2 indicating whether the vehicle is present is sent on line fLl at an "H" level.

FIG. 6 is an internal circuit configuration diagram of the Centro adapter 22, which includes a microprocessor (MPU) 23 dedicated to the adapter.
, RAM 24, ROM 25 containing the fixed adapter program, and RS that interfaces line 9.1.
The interface logic 28 and the centro interface logic 29 that interfaces the line fL3 are connected by a common data bus 27, and the address bus 26
and R/W line 30, and are configured to be able to exchange microinstructions and data with each other. With this configuration, ROM25 or RAM2
4, the MPU 23 performs sequential calculation control and microcode control, and the RS interface logic 28 controls the main body 20.
It performs parallel-to-serial conversion similar to the RS interface logic circuit 12, and is fixed from the beginning at a baud rate of 12 DEG and data specifications of 8 bits, even parity, and 1 stop bit. Centronic interface logic 29 is Centronics specification line i
The data from a is sent to the data strobe signal (DATA 5
TROBE/) and sends it to the MPU 23 via the data bus 27.
KNLG/, S LCT signal, etc. on the centro line 3
Send it to the side. MODEI and MODE2 are both "L"
The label is sent to 1, and when it is connected, it indicates that the external interface is connected and that it is a centro adapter.

FIG. 7 is a flowchart showing the control procedure of the main body 20. First, in step 531, it is determined whether MODEL is at the L''' level. If it is at the 'L' level, it indicates that the external adapter is attached, and the process moves to step S32. If MODEI is at the ++H++ level, the external adapter is not installed, so the printer enters the normal print mode in step 539 and prints according to the input from the keyboard. In step S32, MODE2 is set to "H" level or
'L level, step S40 or 3, respectively.
Moving on to 3, when MODE2 is at the °°H" level, it indicates that the external adapter is an RS adapter, and when it is at the "'L°" level, it indicates that it is an external adapter or a centro adapter. Therefore, steps 540-544
The control flow when the adapter is attached is shown, and steps 533-338 are the control flow when the Centro adapter is attached.

When the RS adapter 21 is installed, in step 540, the RS
The data specifications, baud rate, etc. of the interface logic path 12 are set by inputting from the keyboard 14, and the data specifications and baud rate are matched with those of the host machine connected via RS232C. If known, it will be automatically set to 0. Next, proceed to step 541 and set the data flow control mode to RTS/, CTS/.
Proceeding to step 342, DTR/ is set to L'' to notify the host machine that the electronic type printer side is in the ready state, and in step S43, it is checked by DSR/ whether the host side is in the ready state, and if it is ready. For example, data reception is started in step S44.

Next, when installing the centro adapter 22, step S3
3, the data specifications, baud rate, etc. of the RS interface logic path 12 are the data specifications 4 of the serial interface that have been set in advance on the centro adapter 22 side.
That is, the data length is automatically set to 8 bits, even parity, and 1 stop bit, and in step S34, 120 bits are set.
The baud rate is automatically set to 0 baud rate, and in step S35, Xon/XoFy is automatically set as data flow control. In step S36, DTR/ for R5232C is used as a ready signal to the centro adapter 22, and the ready state of the main body is sent at "L" level, and in step S37, 4tRS
232C7) It is used as a ready signal on the DSR/e Centro adapter side, and when it is “L” level, the adapter side sends a ready status, and both the main unit and the adapter are ready.
At step 538, reception of centro-serial converted serial data is started.

In this way, the signal exchange between the electronic typewriter with RO function and the two external interfaces, namely the electronic typewriter-RS adapter and the electronic typewriter-Centro adapter, can be replaced with the logic level signal of the RS232C. ,and.

By having a separate signal that recognizes that a Centronics adapter is attached, data specifications, baud rate, and data flow control for serial data at the RS232C logic level are automatically set, without the user being aware that it is a Centronics conversion adapter. It became possible to operate with Centronics specifications.

In the embodiment, the case where the power source is taken from the main body 20 has been described, but it is obvious that the power source may be provided in the external adapter 21 or 22 body. Further, although the identification signals for the RS adapter and the Centro adapter are one signal, two individual identification signals may be provided. Furthermore, it is obvious that after setting the data specifications and baud rate fluctuations when the Centro adapter is attached, the effect will not change even if the sequence is the same as that of the RS adapter.

[Effect of the Invention J As explained above, according to the present invention, unnecessary double level conversion can be eliminated when receiving data with any reception specification, especially in electronic typewriters with RO, and it is inexpensive and consumes less power. In addition to realizing less reception, data specifications, baud rate, and data flow control specifications during serial data communication are automatically set using the adapter identification signal.
It has become possible to realize an electronic typewriter with Centronics specifications that does not make the user aware that the Centronics adapter is connected.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electronic typewriter according to an embodiment, and FIG. 2 is an external perspective view of the electronic typewriter. ! Figure $3 is a system configuration diagram for RS232C interface connection. FIG. 4 is a system configuration diagram in the case of Centronics interface connection. Figure 5 is the circuit diagram of the RS adapter. Figure $6 is a block diagram of the Centro adapter, and Figure WS7 is a control flowchart of the electronic typewriter. In the figure, 1...keyboard, 2...carriage, 3...
...Platen, 4...Print paper, 5...Digiwheel, 6...Hammer, 7...Connector, 8...Microprocessor (MPU), 9...Read only memory (ROM) , 10...Random access memory (
RAM), 11... Printer interface logic circuit, 12... RS interface logic circuit, 1
3... Printer drive control circuit, 14... Keyboard. 15...Data bus, 16...Address bus, 17
...R/W line, 18...Printer drive device, 1
9... External I/F circuit, 20... Electronic typewriter, 21... RS adapter, 22... Centro adapter. Patent applicant Canon Co., Ltd. Figure 3 2゜Figure 4

Claims (6)

[Claims] (1) A connection means for connecting a serial adapter that outputs serial reception data as serial data or a parallel adapter that outputs parallel reception data as serial data, and a serial data reception means that receives the serial data via the connection means. , an electronic typewriter comprising identification means for identifying the serial adapter and the parallel adapter. (2) The electronic typewriter according to claim 1, wherein the serial adapter receives serial data in accordance with the EIA-RS232C specification. (3) The electronic typewriter of claim 1, wherein the parallel adapter receives parallel data according to Centronics specifications. (4) Serial data receiving means is EIA-RS232C
An electronic typewriter according to any one of claims 1 to 3, characterized in that it receives serial data according to specifications. (5) An electronic typewriter according to any one of claims 1 to 4, characterized in that the identification means receives the adapter identification code via the connection means. (6) The electronic typewriter according to claim 5, wherein the serial data receiving means determines the EIA-RS232C reception specifications according to the adapter identification code.