JPH02146652A - I/o multiplexer - Google Patents

Abstract

PURPOSE:To automatically set an optimum speed of communication by setting sequentially the different communication speeds until no error exists in the I/O ports in the case an error occurs when the data is transmitted from a selected input/output device. CONSTITUTION:The fixed communication speeds are set at the I/O ports 102, 103 and 106 corresponding to the input/output devices 31 - 33 respectively. In the case an error occurs when the data is transmitted from the selected one of devices 31 - 33, a communication speed control part 113 sets sequentially the communication speeds different from the first set value until no error exists in the ports 102, 103 and 106. Thus it is possible to obtain an I/O multiplexer that can automatically set an optimum communication speed at each of devices 31 - 33.

Description

Detailed Description of the Invention <Field of Industrial Application> The present invention relates to a T10 multiplexer for input/output devices installed in a work station connected to a host computer and having a plurality of input/output devices. This involves improving the management and adjustment of the input/output data communication speed of output devices.

<Prior art> Post 1 - 1, 1 installed in a work station connected to a computer and selectively combining multiple input/output devices
0 multiplexer, for example, in the application filed in 1986 by the applicant of the present application.
No. 1-101362 ll10 Multiplexer.

Figure 3 shows the configuration of a conventional T10 multiplexer.
A small figure.

In this figure, 1 is the T10 multiplexer, 2 is the post 1 to computer, and 31.32.33 is the input/output device.
is the A-board, 32 is the mouse, and 33 is the touch screen. Note that each input/output device 31, 32, 33 is not limited to a keyboard, mouse, and touch screen, and is also used for data communication when connected to this T10 multiplexer 1.
The speed of a is different.

Furthermore, the 1,10 multiplexer 1 has ■10 baud 1 to 1
01 to keyboard 31.1, 10 ball 102 to mouse 32, [, /O port 103 to touch
It is connected to the screen 33 and to the rehost computer 2 through I10 balls 1-104. Each T10 bow 1-10
1, 102. 103.104 is asynchronous,
It has a serial/parallel conversion function and is connected to an internal bus 10;

106 is a CP that controls the entire system via the internal bus 105.
tJ, 107 is a clock generation unit that is necessary for the operation of the CPU 106 and generates a lock, 108. 109 and 110 are setting switches that are composed of dip switches and the like and set data communication speeds corresponding to each input/output device;
1 is a frequency dividing circuit that divides the tarock of the clock generator 107 in order to correspond to several types of communication speeds corresponding to the selected input/output device; 112 is a frequency dividing circuit that divides the interrupt signal TNTR into CP;
This is an interrupt control unit that provides to U106.

In the T10 multiplexer 1 configured in this way, the data communication speed corresponding to each input/output device 31, 32, 33 is set in advance by the communication speed setting switch 108109, 1.
10, and when one input/output device is selected and data communication is performed, the clock of the clock generator 107 is divided by the frequency dividing circuit 111 according to the setting state of the switch of the corresponding input/output device. , selected I/O
Adjusting the data communication speed of the port.

<Problems to be Solved by the Invention> In the conventional T10 multiplexer as described above, the communication speed for each input/output device must be manually set by a switch, and for this reason, the communication data Even if the data format was the same, if the communication speed was different, the switch settings had to be made again. In addition, switches must be installed according to the number of human output devices to be set, which takes up space, and there is also the problem of erroneous switch settings.

The present invention solves these problems and is a T1 system that can automatically set the communication speed for each input/output device.
The purpose is to realize a zero multiplexer.

Means for Solving the Problems> The present invention, which has solved the above problems, is a T10 multiplexer that connects at least one human output device and couples it to a host computer, which first corresponds to each input/output device. If a fixed communication speed value is set for the I/O port to be used, and an error occurs when data is sent from the selected input/output device, a communication speed value different from the initially set communication speed value will be set. Sequentially the above 110
This is a T10 multiplexer characterized by being provided with a communication speed adjustment unit that sets the communication speed until there are no errors in the port.

Function> The T10 multiplexer of the present invention initially sets a certain speed value for each internal I/O port, starts communication with this value, and when an error occurs, sequentially changes the specific value to /O
port so that the optimal speed value is set on the I10 port.

<Embodiment> FIG. 1 is a block diagram showing an example of a T10 multiplexer implementing the present invention.

Components in this figure that have the same reference numerals as the conventional T10 multiplexer shown in FIG. 3 have the same functions, so a description thereof will be omitted.

The T10 multiplexer of the present invention removes the communication speed setting switches 108 , 109 , 110 and the frequency dividing circuit 111 and installs the communication speed adjustment section 113 in the CP tJ 106.
That you have installed it! It is assumed to be 1'8. This communication speed adjustment unit 113 is realized by setting in the CPU 106 using firmware or the like.

Here, the communication speeds of each person's output device, that is, the keyboard 31, mouse 32, and touch screen 33 are 9.6 kbps, 1.2 kbps, and 2.4 kbD, respectively.
Let it be s.

Next, the operation of the 110 multiplexer of the present invention will be explained using the flowchart of FIG.

When the power is turned on, the CPU
106 indicates each I/O port 101 according to the program.
102 Initial value of data format and communication speed in H139.
Set 6kbpS.

It is assumed that the mouse 32 is then selected as the input/output device.

Then, when serial data is transmitted from the mouse 32 to the 110 baud 1-102 at a communication speed of 1.2 kbps,
The I/O port 102 first starts data communication with the programmed initial value 9.6kbDS, and the communication speed adjustment section 113 performs a framing error check. Check the position of the dip bit. At this time, J/O port 1
The preset data communication speed for 02 is 9.6kb.
pS, the actual data communication speed from mouse 32 is 1.2
kbpS, a framing error occurs.

Upon detection of this error, the communication speed adjustment unit 113 controls the I/O
Reset the communication speed to 4.8 kbps for port 102. Then, a framing error check is performed in the same manner. To reset the communication speed, use the communication speed adjustment section 11.
3, e.g. 4.8kbps, 2.4kbps1.2
kbps, 600kbps, 300kbps
This is done by setting values such as in advance in a dimple format and sequentially setting these values to the ■/O port.

Then, if a framing error does not occur, a parity error check is performed, and if a parity error does not occur, the communication speed setting is repeated in the same manner.

This T1 is the speed (fi (1, 2 kbps) when neither framing error nor parity error occurs.
Normal input/output data processing with the mouse 32 is started at the optimum communication speed at 0 baud I-102.

If the framing error or parity error is not cleared after going through the values in item 1, the process moves to error processing.

Similar operations are performed when other input/output devices are selected.

In this way, the optimum data communication speed can be automatically set for each input/output device without human intervention.

<Effects of the Invention> As described above, according to the I10 multiplexer of the present invention, the following effects can be obtained.

When setting the communication speed for each input/output device, there is no need to install a speed setting switch, reducing the time and effort of setting the switch.
Erroneous settings can be avoided, and the optimal speed value can be automatically set for each turntable vise.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of an I10 multiplexer embodying the present invention, FIG. 2 is a flowchart showing the operation of the 110 multiplexer of the present invention, and FIG. 3 is a block diagram of the configuration of a conventional I10 multiplexer. 1...I10 multiplexer, 101, 102, 103, 104...I/O port, 105-...internal bus, 106-CP
LJ, 107...Tarlock generator, 108, 109, 110...Setting switch, 111
... Frequency dividing circuit, 112... Interrupt circuit, 113... Communication speed adjustment section, 2... Host computer, 31... Keyboard, 32...
Mouse, 33...touch screen.

Claims (1)

[Claims] (1) In an I/O multiplexer that connects at least one input/output device and couples it to a host computer, first, the I/O multiplexer corresponding to each input/output device
If a fixed communication speed value is set to the /O port and an error occurs when data is sent from the selected input/output device, the communication speed value different from the initially set communication speed value is sequentially set to the I/O port. An I/O multiplexer characterized in that a communication speed adjustment unit is provided for setting a communication speed until there are no errors in an I/O port.