JPS5826580B2 - Scanning method - Google Patents

Description

[Detailed description of the invention] This invention relates to a scanning method for communication lines.

The transmission speed of the communication line is 1200 bits/second (bps)
Various transmission speeds are used, such as 2400 bps and 9600 bps.

Conventionally, communication control equipment that controls a large number of lines uses
Each communication line was scanned in turn.

For this reason, when different transmission speeds coexist, line scanning is performed in accordance with the high-speed line, resulting in a drawback that the low-speed line is scanned more than necessary.

The present invention eliminates these drawbacks and uniformly scans each line for the transmission speed, and will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention,
On the other hand, FIG. 2 is a diagram showing details of the conversion section shown in FIG. 1 and described later.

In such a configuration, each address of the conversion unit 1 contains the scanning line number N2 and change information P for changing the designated address of the conversion unit 1.
S3 is stored.

4 is a scanning line number signal line, 5 is a change information signal line, 6 is a counter, and 7 is a selector.

The conversion unit 1 is composed of either a read-only memory, a read/write-only memory, or a converter using an AND element or an OR element.

The contents of the converting section 1 are taken out according to the instructions of the count value of the counter 6, and among the taken contents, the scanning line number N2 is transferred to the line control section (not shown in the figure) through the scanning line number signal line 4. Ru.

The change information PS3 is transferred to the selector 7 via the change information signal line 5, and the value selected by the selector 7 is set in the counter 6.

The counter 6 is a binary counter, and when the value is not changed by the change information 3, the value is counted by the clock.

For example, (a) Line 1 with a transmission speed of 2400 bps
If you are dealing with 2 lines and 1 line of 9600 bps, the line numbers of the 1st to 12th lines of 2400 bps are N.
Ol to N12, and the line number of the 0th line of 9600 bps is NOO.

As shown in FIG. 2, the line numbers are stored at addresses 10 to 25 of the converter 1 in accordance with the scanning order.

As for change information 3, it is assumed that PSlo is stored at address 25 of conversion unit 1, and change information PS3 is not stored at addresses 10 to 24.

PSl, which is the change information PS3 stored at address 25
It is assumed that when 0 is manually input to the selector 7 via the change information signal line 5, the selector 7 selects the value 10 (8) in the selector.

Next, (b) line 10 with a transmission speed of 2400 bps
line and 4800 bps line and 1 line and 9600 bps
When handling one line of s, 10 of 2400 bps
Line numbers NO1 to N10, 4800 bps
A line number of N13 is assigned to the line, and a line number of NOO is assigned to the line of 9600 bps.

Also, as shown in FIG. 2, line numbers NOO to N12. N1
3 are stored in the conversion unit 1 at addresses 50 to 65 in the scanning order.

It is assumed that the change information 3 is stored in the PS 50 at address 65 of the conversion unit 1, and there is no change information 3 at addresses 50 to 64.

It is assumed that when PS50, which is the change information PS3, is manually entered into the selector 7, the selector 7 selects the value 50 (9) in the selector.

First, case (2) will be explained.

The value of counter 6 is 10, and the contents of address 10 of converter 1 are taken out.

Since the scanning line number 2 is NOO, the 0th line is scanned.

Since there is no change information 3 in the contents of address 10 of converter 1, when the scanning of the 0th line with a transmission rate of 9600 bps is completed, the value of counter 6 is incremented by l, and then the value of address 1 of converter 1 is increased by l.
The contents of address 1 are extracted.

Since the content of scanning line number 2 is NOl, the transmission speed is 48
The first line at 00 bps is scanned.

When this scanning is completed, there is no change information 3, so the counter 6
The value of is further incremented by 1, and the contents of address 12 of conversion section 1 are taken out.

Since there is no change information PS3 up to address 24, the contents of converter 1 are extracted in the same manner from address 10 to address 24 in order, and the lines are 0th line, 1st, 2nd, 3rd, 01st.
The 4th, 5th, 6th, 01, 7th, 8th, 9th, 0th, 1O1, 11th lines are scanned in this order.

When the contents of address 25 of converter 1 are extracted, the 12th line is scanned because the line number is N12, and when the scanning is completed, p is stored at address 25 of converter 1 as change information PS3.
si.

is stored, so selector 7 selects the value 1 in the selector.
o(s) is selected and the counter 6 is set to 10.

Then, repeat the above operation again.

Therefore, while the contents from address 10 to address 25 of the converter are extracted and the line is scanned, the transmission speed is 9600 bps.
The 0th line (line number N00) of is scanned 4 times and 240
0 bps 1st to 12th lines (line numbers NO1 to N1
2) will each be scanned once.

Next, line scanning in case (b) will be explained.

A value of 50 is set in the counter 6 by the selector 7, and the contents of address 50 of the converter 1 are taken out.

Then, by the same operation as in the case (a) above, the contents of addresses 50 to 65 of the conversion unit 1 are extracted, and the contents of the 0th line, the 13th, the 1st, the 2nd, the 0th, the 3rd, and the 4th line are taken out in order. , 5th, 01th, 13th, 6th, 7th, O1, 8th, 9th, and 10th lines are scanned. When the scanning of the 1st O line is completed, the change information at address 65 of converter 1 is changed. Based on the contents PS50 of PS3, the value 50 (9) in the selector is selected by the selector 7, 50 is set in the counter 6, and the above operation is repeated again from address 50 of the converter 1.

Therefore, the 0th line (line number N00) with a transmission speed of 9600 bps is transmitted four times, the 13th line (line number N15) with a transmission rate of 4800 bps is transmitted twice, and the 1st to 10th lines with a transmission rate of 2400 bps are transmitted four times.
Each line (line numbers NO1 to N10) will be scanned once.

Although the two cases (a) and (b) mentioned above are mentioned as scanning examples above, various other combinations of line scanning can be executed using the scanning order in which the line numbers are arranged in the scanning order in the conversion unit 1. This is possible by storing the change information PS3, the counter 6, and the selector 7 to specify the starting address where the desired scanning order of the converter 1 is stored.

Furthermore, it goes without saying that various types of scanning can be performed by changing the contents of the conversion section 1 in accordance with line scanning.

Although the above description has been made regarding the case of line scanning, the present invention is not limited to this, and may be used for sampling human input data of process control input/output equipment.

As described above, according to the present invention, it is possible to uniformly scan lines of different transmission speeds with a simple configuration.
Furthermore, it is possible to easily change the line scanning order and scanning synchronization.

In addition, since the initial value of the scanning counter is set, the starting address of the converter can be specified arbitrarily, and the conversion table to be used can be selected from among the multiple conversion tables prepared in the converter. Has selectable features.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.
The figure is a diagram showing in detail the contents of the converter shown in FIG. 1. In the figure, 1 is a conversion unit, 2 is a scanning line number, 3 is change information,
4 is a scanning line number signal line, 5 is a change information signal line, 6 is a counter, 7 is a selector, and 8 and 9 are numerical values stored in the selector. In the drawings, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] 1 Communication that scans each line, connected to a number of lines with different transmission speeds, having a counter and a conversion unit that outputs change information instructing to change the count value and a scanning line number based on the count value of the counter. In the scanning method of the control device,
A selector is provided for selecting an initial count value to be set in the counter based on the change information, and a scanning order group in which the scanning line numbers are arranged is provided in the converting unit in order to optimally scan each line having a different transmission speed. , the initial setting value specifies the first address where the scanning order of the conversion unit is stored, the change information sets the counting initial setting value as the count value of the counter, and the counter sequentially counts. The scanning method is characterized in that scanning is performed optimally for the transmission speed of each line based on the scanning line number output from the converter based on the count value of the counter.