JPH0769996B2 - Simultaneous measurement data transmission method - Google Patents

Description

The present invention relates to a data transmission method, and more particularly to a simultaneous measurement data transmission method suitable for transmitting measurement data at a plurality of locations at the same time as a series of sequential data. .

(Prior Art) Usually, when electrically measuring temperature, pressure, etc., the measured value is obtained as an analog signal. However, when it is necessary to measure at multiple points and to transmit multiple types of measured values to remote locations, analog signals are converted to digital signals, and in addition, multiple types of digital signals are used to reduce the number of transmission lines. Are serially transmitted in a time division manner.

(Problems to be Solved by the Invention) However, in such a transmission method, the lack of simultaneity of a plurality of measurement values cannot be avoided, and it is necessary to collect a plurality of measurement values at one place. For example, when measuring the ink film thickness distribution on the ink roller of the printing machine in the roller axis direction, it is desirable that there are a plurality of measurement points and the measurement values are acquired at the same time. However, in the above-described transmission method, a plurality of types of measurement values are placed on the transmission line by sequentially scanning, for example, by the switching mechanism of the A / D converter, so that the measurement values are acquired at different timings. From the above viewpoints, it is an object of the present invention to provide a simultaneous measurement data transmission method capable of transmitting a large amount of data simultaneously measured with a minimum transmission line.

(Means for Solving the Problems) The transmission method according to the present invention uses an A / D conversion unit for converting an analog measurement signal into digital data and a serial data generation for converting the data from the A / D conversion unit into serial data. A plurality of conversion units each of which is connected in a cascade connection, and each of the A / D conversion units of the plurality of conversion units is provided with a timing setting unit that defines a data acquisition timing.
The data acquisition timings of the A / D converters are set at the same time, and
By issuing a read command at a different timing,
It is characterized in that measurement data at a plurality of points can be sequentially read out by one operation.

(Example) Below, the Example of this invention is described with reference to drawings.

FIG. 2 shows the structure of the conversion unit which is the main part of the present invention, and converts the analog input A _i into serial data S _o . The conversion unit 1 includes an amplifier 11 with an analog input A _i .
And an A / D converter 12 and a serial data generator 13 for converting parallel digital data from the A / D converter 12 into serial data. The A / D converter 12 is an amplifier 11
From analog data to n-bit parallel data, and the conversion timing is specified by an external trigger T _r . The A / D converter 12 also has a buffer function for holding n-bit parallel data.

FIG. 3 shows the configuration of the serial data generation unit 13, which has a shift register 131 and a parity code generator 132 capable of inputting either parallel or serial and having a load / shift switching function. Here, as an example of the data format, a case where 1-bit start bit, 1-bit parity bit, and 2-bit stop bit are added to 8-bit data is given. The serial data generation unit 13 outputs the serial data S _{i as} it is as the serial data S _o , and the 8-bit parallel data from the A / D converter 12 has a start bit at the beginning, a parity bit at the back, and a parity bit at the back. Output as serial data S _o with the stop bit added.

FIG. 1 is a configuration diagram of a main part of a transmission system according to the present invention,
M conversion units 1 shown in FIG. 2 (m is a positive integer)
It consists of cascade connection. That is, the serial data generators of the conversion units are connected in series. Each transform unit 1-1 to 1-m conversion timing of the A / D converter, that is, the data acquisition timing defined by the external trigger T _r1. In addition, the first timing pulse T _m1 obtained by passing the external trigger T _r1 through the timing controller 2
Defines the latch timing in the buffer in the A / D converter, and the second timing pulse T _m2 defines the shift timing of the serial data generator. A data analysis unit 3 analyzes serial data that has passed through all the conversion units 1-1 to 1-m.

In this method, analog measurement data from a plurality of measurement points is converted into data of channels cho to chm and conversion units 1-1 to 1 are used.
-M, the serial data DI is converted into a digital signal according to the external trigger T _r1 and then the serial data DI is input to the data analysis unit 3.
Is output to. Here, the external trigger T _r1 is a signal generated by electrical or mechanical means in the measured portion, for example, in the case of measuring the ink film thickness distribution of the ink roller described above, it is a signal generated periodically for each rotation of the ink roller. Is. The read request Read is a signal generated from the data analysis unit 3 in a fixed cycle or by key input or the like as necessary.

The timing controller 2 arbitrates the timing between the external trigger T _r1 and the read request Read, and the data output operation is performed by giving priority to the external trigger T _r1 . That is, when the external trigger T _r1 is input, A / D conversion is performed simultaneously in the A / D converter of each conversion unit regardless of the read request Read, and the converted digital data is stored in the A / D converter. Stored in the buffer. The timing controller 2 has a built-in delay circuit, and a first timing pulse T _{m1 obtained} by delaying the external trigger T _r1 for a fixed time.
Is output, and then 12 × m second timing pulses T
Output _m2 in time series. First timing pulse T _m1
The delay time for generation is the time required for A / D conversion in the A / D converter. Thus, if the external trigger T _r1 precedes the read request Read, the data stored in the buffer in the A / D converter is sent to the serial data generator by the first timing pulse T _m1 in each conversion unit. The data is latched, the latch data in the serial data generator is shifted by the second timing pulse T _m2 , and the serial data is output.

On the other hand, if the read request Read _precedes the external trigger T _r1 , the timing controller 2 outputs the data stored in the buffer of the A / D converter after all the shift operations in the serial data generation unit are completed. The serial data generation unit is controlled to latch.

As described above, the present transmission method can output a plurality of simultaneous measurement data as serial data, and is suitable for fixing the data length, that is, for measuring a homogeneous distributed quantity. Further, it can be effectively used even when the measurement points are distant from each other and it is difficult to concentrate the analog measurement signal at one place and perform A / D conversion. The present invention is not limited to the embodiment, and the number of bits of digital data to the serial data generation unit, the mode of added bits, and the like can be arbitrarily changed.

(Effect of the Invention) According to the present invention, a plurality of conversion units including an A / D conversion unit for converting an analog measurement signal into digital data and a serial data generation unit are serially connected, and A / D conversion in each conversion unit is performed. It is possible to measure at the same time by sharing the timing signal of, and these data can be taken out as serial data by the shift command.
The number of transmission lines can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a configuration diagram of the conversion unit in FIG. 1, and FIG.
The block diagram of the serial data generation part in the figure. In the figure, 1 is a conversion unit, 2 is a timing roller, and 3 is a data analysis unit.

Claims (1)

[Claims] 1. A first to m-th A / A converter having first to m-th trigger input terminals for converting analog measurement signals respectively inputted from the first to m-th analog input terminals into digital data.
It has a D conversion unit and a serial data input terminal, a shift terminal, a latch terminal, and a serial data output terminal,
The first to mth conversion units including the first to mth serial data generation units for converting the data from the first to mth A / D conversion units into serial data are cascade-connected, and
The serial data output terminal of the (i = 1 to m-1) serial data generation unit is connected to the serial data input terminal of the (i + 1) th serial data generation unit, and a trigger signal line for inputting a trigger is provided. Latch timing signal lines that are commonly connected to the first to mth trigger input terminals and that input a latch timing signal for latching the digital data are commonly connected to the respective latch terminals.
A shift timing signal line for inputting a shift timing signal for shifting the latch data in the mth serial data generation unit is commonly connected to each of the shift terminals, and is connected to the first to mth A / D conversion units. A timing setting unit that defines the data acquisition timing by supplying the trigger is provided, and the data acquisition timings of the respective A / D conversion units are set at the same time, and further in response to a read command issued at a different timing. A simultaneous measurement data transmission system comprising a timing controller capable of sequentially reading measurement data at a plurality of points by one operation by issuing the latch timing signal and the shift timing signal.