JPS6275827A - Control system for connection of keyboard - Google Patents

Abstract

PURPOSE:To attain a keyboard connection control system which is free from the troublesome exchange of keyboard units, etc., by connecting simultaneously plural keyboard units of different specifications of key array, etc. via the serial interface transfer lines. CONSTITUTION:A keyboard unit 13 is connected to a host system 11 via a master keyboard unit 12. When a certain key is pushed on the unit 13, a request signal is produced to the unit 12 via a line 202. While the unit 12, if confirming that the self key is not pushed, informs the request signal received via the line 202 directly to the system 11. Receiving this request signal, the system 11 transfers the polling data to the unit 12 and then to the unit 13 as it is. Thus the unit 13 transfers the key data to the unit 12 and then to the system 11 as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Summary of the Invention] The present invention relates to a key gate connection control system in which a plurality of keyboard units having different specifications, such as a keyboard arrangement, are connected simultaneously.

[Technical background of the invention and its problems]

Recently, scan type keys have been standardly used. This kind of key scans the key matrix twice with an interval of 5 milliseconds, for example, and when both are turned on, the second key code is stored in the second buffer, and the key code from the previous scan is By comparing the contents of the old buffer in which the pressed key code is stored, it is determined whether the key has been pressed or released.

By the way, in the past, the number of keys connected to each stage was one unit, and it was fixed at FJ.

However, the key gate unit should originally be selected depending on the business, and there are types suitable for each business, such as a JIB layout keyboard and a touch-in keyboard (book mat). Therefore, if the connected keyboard units are fixed to one type, this may be inconvenient depending on the job and may have a sudden impact on operability. Therefore, when connecting keyboard units with different specifications,
The drawback was that the keyboard unit had to be reconnected each time.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a keyboard connection control system that simultaneously connects a plurality of keyboard units having different specifications such as key layouts, and eliminates the hassle of replacement.

[Summary of the invention]

In order to achieve the above object, the present invention connects a host system and a keyboard unit serving as a mask through a serial interface transfer path having a half-duplex serial data line and a request line, and connects the same interface to the keyboard unit serving as a master. It is connected to another keyboard unit with different specifications such as key arrangement through a transfer path.The keyboard unit that serves as a mask has a built-in processor unit, and both serial data lines listed above can be controlled by the built-in processor unit. Intermittent (0N
10FF), and by controlling this switching circuit, in addition to sampling the received data and controlling the own keys, it also controls two serial data lines, and historically it is possible to control two serial data lines. The configuration also controls requests.

This makes it possible to simultaneously connect a plurality of keyboard units with different specifications such as key arrangement, and eliminates the hassle of replacing the keyboard units.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail using the drawings. Figure 1 is a block diagram showing an embodiment of the invention.

In the figure, 1z is a host system, 12 is a keyboard unit (KB, ) serving as a mask, and 13 is a keyboard unit (KB2) different from the above-mentioned mask with different specifications such as key arrangement. The host system z1 and the master keyboard unit 12 have a half-duplex serial data line 1.
A serial interface consisting of 01 and request line 102, and a master keyboard unit L1
The keyboard unit 13 is also connected via a serial interface consisting of a serial data line 201 and a request line 202.

FIG. 2 is a schematic clock diagram showing the internal configuration of the master keyboard unit shown in FIG. J1.

In the figure, blocks and lines labeled with the same numbers as in FIG. 1 are the same as those in FIG. In the figure, 121
is a microprocessor (μCPU) that serves as the control center. 122 is a switching circuit. The switching circuit 122 connects and connects the serial data line 101 with the host system 11 and the serial data line 2θ1 from the keyboard unit 13. A gate signal for controlling this on/off is generated by the microprocessor f121 and is supplied via line 123.

Note that INT is an interrupt input terminal, and numbers 21 and 2 are input/output ports that the microprocessor 21 has.

The operation of the embodiment of the present invention will be described in detail below. First, regarding the normal manual key operation, the host system 11
This will be explained using the space between and the master keyboard unit ER2-. When a key on the master keyboard unit I2 is pressed, a request signal is issued to the host system 11 via line 102. Then, polling data is transferred from the host system 11 to the master keypad unit 12 via line 101. Then, key data is similarly transferred from the master keyboard unit 12 to the host system 11 via the transfer path of line 101. Line 101 is a half-duplex serial data transfer path as described above. By the way, there are various types of keyboard units, including key layouts and manual key operations.
There are different types that are suitable for different types of work. Conventionally, each keyboard unit had the same interface to the host system, and the keyboards were exchanged and connected for each job. In contrast, the present invention describes a method for connecting keyboards having different functions at the same time.

FIG. 1 shows an example of the connection, in which a mask keyboard unit 12 is connected to the host system 1, and a keyboard unit 13 is further connected to the master key unit 12. That is, the key hand unit 13 is connected to the host system 11 via the master key hand unit 12. Here, when a certain key of the keyboard unit 13 is pressed, a request signal is generated to the master keyboard unit 1 via the line 202. As a result, when the master key confirms that its own key has not been pressed in the keypad 12, the request signal that has arrived via the line 202 is directly sent to the line 102 as a request signal and is notified to the host system 11. When host system 11 receives this request signal, it transfers polling data to master keyboard unit 12 using data line 101. The mask keyboard unit 12 transfers this polling data as it is to the keyboard unit 13 using the data line 201. When the keyboard unit 13 receives the polling data, it transfers the key data to the master keyboard unit 12, and the master keyboard unit 72 further transfers the data to the host system 11.

When a key is pressed in the keyboard unit 12 while a request signal is not being output from the hand unit 13, the request signal also issued via the line 102 is transferred to the host system J, 11. Il sends Paul Link Cheetara to the mask keyboard unit-12-. The master keyboard unit 12 interprets this as polling data for itself and transfers the key data to the host system 11.

This will be explained in detail using FIG. When no key is pressed on the master keyboard unit 12 itself, the gate signal issued via the line 123 becomes HIGH' level, and the switching circuit 122 is turned on (the keyboard unit is turned on).
The 13th node y'-1 transfer path 201 and the data transfer path 101 of the host system 11 are in a connected state. Therefore, polling data from the host system 11 or key data from the keyboard unit 1g is transmitted regardless of the microprocessor 121. Furthermore, when a key is pressed on the master keyboard unit 12 itself, the microprocessor 121 sets the gate signal to the 'LOW' level after confirming that there is no data on the data transfer path between the host system 11 and the keyboard unit 13. setting, and turns off the switching circuit 122. By turning off the switching circuit 122, the data transfer path between the host system 11 and the key hand unit 13 is cut off, and the data transfer path between the host system 11 and the microprocessor 1 is disconnected.
21. In other words, the master keyboard unit 12fMJ performs data transfer. [Effects of the Invention] As explained above, according to the present invention, multiple keyboards with different specifications can be connected at the same time, making it possible to replace the keyboard unit, etc. freed from the harshness of

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing the internal configuration of the master keyboard unit shown in FIG. 1. 11... Host system, 12... Master keyboard unit, 13... Keyboard), 101.
201...Cow double serial data line, 102.2
02...Questline, 121...Microprocessor, z22...Switching circuit. Applicant's agent Patent attorney Takemon Suzue Figure 1 Figure 2

Claims (1)

[Claims] The host system and the keyboard unit are connected via a serial interface transfer path having a half-duplex serial data line and a request line, and the keyboard unit is further connected to another keyboard unit via the same serial interface transfer path as above. , the keyboard unit has a switching circuit that connects both serial data lines on and off under the control of a built-in processor unit, and by controlling the switching circuit, it samples the received data and determines the status of its own keys. A keyboard connection control method characterized by detecting and notifying the host system, as well as detecting requests issued from other keyboard units via the above request line, and notifying the host system of the status via the serial data line. .