JPS61253942A - Transmitter-receiver - Google Patents

Abstract

PURPOSE:To reduce the cost of equipment by transmitting one-way polarity counting pulses successively from a command unit to transmission lines and obtaining a DC power source on the basis of the counted pulses in each transmitting/receiving unit. CONSTITUTION:A negative polarity reset pulse P0 and positive polarity counting pulses P1-Pn are outputted from the command unit 1 to the transmission lines La, Lb and respective transmitting/receiving units 21-2n obtain DC power sources from the positive polarity counting pulses P1-Pn. Thereby, it is unnecessary to form AC power supply equipment for obtaining DC power sources in respective units 21-2n, so that the units 21-2n can be miniaturized and can be inexpensively produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a transmitting/receiving device in which a plurality of transmitting/receiving units having transmitting/receiving functions are connected to the same transmission path.

[Prior Art] A conventional transmitting/receiving device of this type has a command unit that sequentially transmits counter pulses at predetermined time intervals connected to a pair of transmission paths, and a plurality of transmitting/receiving units connected to the transmission path. However, when the transmitting/receiving unit determines that the count value of the counter pulse output from the command unit matches the count value assigned in advance to the transmitting/receiving unit, the determined transmission/reception 1 nit and the command It has been considered that the data signal is selectively transmitted between the transmission unit and the determined transmitting/receiving unit via the transmission path.
Unlike data signal transmission using power lines, this method has the advantage that each transmitter/receiver unit does not need to be provided with a modulation circuit and a demodulation circuit for the data signal. However, in the conventional configuration described above, a power line must be drawn into each transmitting/receiving unit to obtain DC power from the AC power supply, and it is necessary to provide AC power supply equipment for each transmitting/receiving unit.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a transmitting/receiving device that does not require providing AC power line equipment to each transmitting/receiving unit and can reduce equipment costs accordingly. .

SUMMARY OF THE INVENTION 1 The present invention sequentially transmits count pulses of one polarity having a pulse width equal to or greater than a set width from a command unit to a transmission line with a predetermined space, and transmits the count pulses in each transmitter/receiver unit. When the output of one polarity from the command unit is equal to or larger than the set width, it is determined to be a count pulse and a count operation is performed, and the data signal is transmitted in the space between the count pulses. This is something that we do not want people to do.

[Example] An example of the present invention will be described below with reference to the drawings.

Fig. 2 shows the configuration of the entire system, where 1 is a command unit, 21.2t, .
, Lb. In this case, the command unit 1 includes a clock pulse generation circuit that has an oscillator and generates a clock pulse of a constant period by dividing the oscillation output, and a clock pulse generation circuit that generates clock pulses from the clock pulse generation circuit. The operating hexadecimal 10th counter and the count value of this first counter (Calan 1)
The signals shown in Figure 3(b) are output to the transmission lines 1-a and 1-b by intermittent DC power supply voltage of one polarity, positive (+) and opposite polarity, negative (-) according to the and an output circuit. That is, as shown in FIG. 3(b), the command unit 1 first outputs a negative (-) polarity rectangular wave reset pulse PO when the count value of the first counter is "0" to "4". Then, when the count value of the first counter is "5" to "12", a positive (+) polarity square wave count pulse P1 is output, and after that, the first counter pulse P1 is output.
Every time the count value of the counter becomes "0" to "12", a positive (+) polarity square wave count pulse P'2. P3
．． . . . pn are output sequentially, and therefore the count pulses P1 . P2, P3.

. . . A count value r13J, which is a predetermined area of the first counter, is provided between each count pulse pn and between the final stage count pulse pn and the next reset pulse Po.

Zero (0) level spaces SP, . . . are formed corresponding to "14" and "15", and a reset pulse Pa exists in the stage preceding the first stage count pulse P1.

Now, according to FIG. 1, the transmitting/receiving units 21, 22,...
2n, since they have the same configuration, the configuration of the transmitting/receiving unit 21 will be described as a representative. That is, 3 and 4 are input/output terminals, and these are the transmission line L.
a and Lb, respectively, and especially the input/output terminal 4 is grounded.

A rectifying diode 5 has an anode connected to the input/output terminal 3 and a cathode connected to the positive DC power supply terminal 6. A smoothing capacitor 7, which together with the rectifying diode 5 forms a DC power supply circuit, is connected between the DC power supply terminal 6 and the ground. 8 is a positive polarity signal detection circuit equipped with a photocoupler, etc., whose input terminal is connected to the input/output terminals 3 and 4, detects a positive polarity signal, and outputs a corresponding detection signal from the output terminal. 9 is a negative polarity signal detection circuit equipped with a photocoupler, etc., whose input terminal is connected to the input/output terminals 3 and 4.

A negative polarity signal is detected and outputted as a corresponding detection signal from the output terminal. In the positive polarity signal detection circuit 8 and the negative polarity signal detection circuit 9, one output terminal of each is connected to the input ports Ia and lb of the microcomputer 10, which is a control circuit, and the output terminal of each other is It is grounded. Although not shown, this microphone cocomputer 10 is provided with a clock pulse generation circuit that generates clock pulses at the same period as the clock pulse generation circuit included in the command unit 1, and a clock pulse from the clock pulse generation circuit. comprising a first counter that performs a counting operation;
It operates as described below. In this microcomputer 10, the output port Qa
is connected to the data output terminal 11, the output port Qb is connected to one input terminal of the OR circuit 12, and the output port O
C is connected to the other input terminal of the OR circuit 12.

Furthermore, the output terminal of the OR circuit 12 is NPN via a resistor 13.
The base of the transistor 14 is connected to the base of the transistor 14. 15
is the OR circuit 12. This is a transmission circuit that is a transmission means that includes a resistor 13 and a transistor 14, and will be described below. That is, in the transistor 14, the emitter is grounded, and the collector is connected to the base of a PNP type transistor 17 via a resistor 16. This transistor 17 has an emitter connected to the DC power supply terminal 6 and a collector connected to the input/output terminal 3 via a reverse current blocking diode 18.

Next, the operation of this embodiment will be explained with reference to FIG. 3. For example, when the power is turned on to start operation, the command unit 1 generates a reset pulse as shown in FIG. Po, count pulse P1゜P2. ... pn is transmission line 1. The positive polarity count pulses P 1 +Pg, . As a result, a DC power is output between the DC power terminal 6 and the ground, and this DC power is supplied to each circuit of the transmitting/receiving unit 21. Such operation is performed by other transmitting/receiving units 22. ...
The same applies to 2n. On the other hand, when the reset pulse Pa is output from the command unit 1 to the transmission lines 1a and 1b, it is transmitted to the negative polarity signal detection circuit 9 of the transmission/reception unit 21.
The input port lb of the microcomputer 10 is detected and outputs a corresponding detection signal.
This means that the reset pulse Pa has been applied to. Then, in each microcomputer of the command unit 1 and the transmission/reception unit 21, when the negative polarity signal continues for more than a set width, for example, for 4 counts of the first counter, that is, 4 bits, this is determined to be a reset pulse Pa, Thereafter, the second counter is reset to rOJ in synchronization with the rise of the reset pulse PO, which is the negative polarity signal. Similarly, other medical sending/receiving units 22. ...2n second counters are also reset to "0". Furthermore, in the transmission/reception unit 21, when a reset pulse Pa is applied to the input port Ib of the microcomputer 10, the microcomputer 10 starts to drive the first counter in synchronization with the rising edge of the reset pulse Pa. , the first counter starts a counting operation in a synchronous relationship with the first counter of the command unit 1. Similarly,
The first counters of the other transmitting/receiving units 1-2z, . . . , 2n also start counting operations in synchronization with the first counter of the command unit. Thereafter, the command unit 1 begins to output the count pulse P1 to the transmission lines la and lb, and the positive polarity signal detection circuit 8 of the transmitting/receiving unit 21 detects this and outputs a detection signal in accordance with this. , therefore, the input port r of the microcomputer 10
This means that the count pulse P1 is given to b. Then, in each microcomputer of the command unit 1 and the transmitting/receiving unit 2, when the positive polarity signal continues for more than a set width, for example, for 4 counts of the first counter, that is, 4 bits, this is determined to be a count pulse P1, Thereafter, the second counter performs a counting operation in synchronization with the fall of the count pulse P1, which is the positive polarity signal, and the count value becomes "1". Similarly, other transmitting/receiving units 22,
...2n second counters also count, and the count value becomes "1". In this case, each transmitting/receiving unit 21.22, . . . 2n has a “1”.

[2], . . . rnJ count values are respectively assigned, and when the count value of the second counter reaches the count value assigned to itself, transmission/reception operations with the respective command units 1 are permitted. It has become so. Therefore, as described above, when the count value of the six second counters of the transmitting/receiving units 21, 22, . Transmission and reception operations with unit 1 are permitted. Thereafter, when the command unit 1 needs to send data to the transmitting/receiving unit 21, it synchronizes with the count value "13" of the first counter and sends a negative polarity data pulse Po as a data signal (Fig. 3 (C) ), and this data pulse Po is
As shown in FIG. 3(a), the count value of the first counter in the space SP after the count pulse P1 is "1".
The signal is transmitted to the transmitting/receiving unit 21 via the transmission paths la and lb using the portion corresponding to "3". Further, this data pulse Po is detected by the negative polarity signal detection circuit 9 in the transmission/reception unit 21 and is applied to the input port Ib of the microcomputer 10. The data pulse Po is now received in synchronization with the counter i-value corresponding to the count value "13" of the first counter, and upon completion of the reception, the first counter of the command unit 1 in the first counter Count value "14"
” and the data reception signal @Pa corresponding to the count value synchronized with
is output from the output port Qa, and a high-level synchronization pulse Pb (see Fig. 3(f)) is output from the output port o.
Output from b. The data reception signal pa output from the output port Oa is applied to the data output terminal 11 to operate a predetermined load. Furthermore, the high-level synchronizing pulse Pb output from the output port ob is now applied to the base of the transistor 14 via the OR circuit 12 and the resistor 13, turning on the transistor 14, and therefore turning on the transistor 17. . As a result, the charging voltage of the capacitor 7 is transferred between the emitter and collector of the transistor 17 and the diode 18, and then between the input and output terminals 3.4 as a positive confirmation pulse PR (Fig. 3 (d)
), and this confirmation pulse PR is output as shown in FIG. 3(a), as shown in FIG. The signal is transmitted to the command unit 1 via the transmission lines la and lb using the portion corresponding to the count value "14". In the command unit 1, this confirmation pulse PR is now received in synchronization with the count value "14" of the first counter, and since this reception causes the count value of the second counter to be "1", this The transmitting/receiving unit 21 to which the count value "1" is assigned determines that data reception is complete. Thereafter, the microcomputer 10 generates a synchronization pulse pc (see FIG. 3 (Q)) in response to a count value of the first counter that is synchronized with the count value "15" of the first counter of the command unit 1. is output from the output port OC, so the transistor 14 is turned on, and then the transistor 17 is turned on, and the charging voltage of the capacitor 7 is input/output as the data signal check pulse PH (see Fig. 3(e)). It is output between terminals 3 and 4. As shown in FIG. 3(a), this check pulse P)l corresponds to the count value "15
'' is transmitted to the command unit 1 via the transmission paths La and lb. . In the command unit 1, this check pulse PH is received in synchronization with the count value "15" of the first counter, and as a result of this reception, the count value of the second counter becomes "15".
”, it is determined that the transmitting/receiving unit 21 to which this count value “1” is assigned is operating normally. If the command unit 1 does not receive this check pulse Po, the command unit 1 determines that the transmitter/receiver unit 21 is not operating normally due to a failure such as a disconnection, and takes appropriate actions. It turns out. Thereafter, when the command unit 1 outputs the count pulse P2, the count value of the second counter of the command unit 1 becomes "2" in the same manner as described above, and this is also transmitted to the transmission path La e Lb and sent to the transmitting/receiving unit 21 + 22 +...2n
, and the count value of these second counters becomes "2". As a result, transmission and reception operations are now permitted between the transmission and reception unit 22 to which the count fil r2J is assigned and the command unit 1. Thereafter, in the same manner, each time the command unit 1 generates a count pulse, the count value of the six second counters of the transmitting/receiving units 21, 22, . When the transmission/reception operation with the unit 1 is allowed, and when the transmission/reception operation between the transmission/reception unit 2n and the command unit 1 is completed and one cycle of operation is completed, the command unit 1 is reset again. The next cycle of operation is performed by outputting the pulse Po. In addition, the transmitting/receiving units 21, 22, ・
...2n first counters each have a count pulse P
1* P 21...It is designed to be driven in synchronization with the falling edge of Pn, and the count value of each second counter changes to a count value other than the count value assigned to itself. It will be reset from time to time.

As described above, according to the present embodiment, the negative polarity reset pulse Pa and the positive polarity count pulse P l * P 2 m... pn are sent from the command unit 1 to the transmission lines La and Lb.
are output from each transmitting/receiving unit 21 , 22 .

...At 2n, positive polarity count pulse Pr, P2
,...Pn, it is not necessary to provide AC power supply equipment for obtaining DC power in each transmitting/receiving unit 2s, 22,...2n, and that is all because each transmitting/receiving unit 21, 22... ,...2n can be made small and manufactured at low cost, and the overall equipment cost can be reduced.

Further, according to this embodiment, as described above, the transmission lines La, L
Count pulses P1, P2, with large pulse widths are placed in b.
Even if pn is transmitted, between the command unit 1 and the transmitting/receiving unit 2 le 221...2n, the count pulse P 1 + P 2 +...Pn
Since the space SP existing between each other and between the count pulse pn and the reset pulse Pa is used to transmit and receive the data pulse Po as the data signal, the confirmation pulse PR, and the check pulse PH, it is possible to It will not cause any trouble.

Moreover, according to this embodiment, the negative polarity signal output from the command unit 1 is the reset pulse Pa and the data pulse P.
Since the power capacity of the negative polarity power supply is small, the transmission circuit 15 of the transmitting/receiving units 21, 22, .
．． It has the advantage of requiring a simple circuit configuration consisting of a combination of 5 and 18 diodes.

In the above embodiment, the command unit 1 and the transmitting/receiving unit 2
1 + 22 +...2n, but for example, two transmitting/receiving units are considered to be one unit group, and the count value of the second counter is assigned to that unit group. Data signals may be transmitted and received between the transmitting and receiving units of the unit group when the count value reaches a certain value.

In addition, it goes without saying that the present invention is not limited to the embodiments described herein and shown in the drawings, and can be implemented with appropriate modifications within the scope of the invention.

[Effects of the Invention] As explained above, the present invention supplies one-polarity count pulses from the command unit to the transmission line, and each transmitter/receiver unit obtains DC power based on the count pulses. There is no need to provide the transmitting/receiving unit with AC power equipment for obtaining DC power, and this has the excellent effect of reducing equipment costs.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is an explanatory diagram of the electrical configuration of the transmitting and receiving unit, FIG. 2 is a block diagram showing the overall system configuration, and FIGS. FIG. 3 is a signal waveform diagram of each part of unprinting. In the drawing, 1 is a command unit, 21.22,...2n
is a transmitting/receiving unit, 7 is a capacitor, 8 is a positive polarity signal detection circuit, 9 is a negative polarity signal detection circuit, 10 is a microcomputer (control 1 circuit), 15 is a transmission circuit (transmission means)
shows. Applicant: Tsukaho Electronics Co., Ltd. I, - Field attorney: Tsuyoshi Sato, patent attorney - “j 1~: E゛No. 12

Claims (1)

[Claims] 1. Sequentially transmit count pulses of one polarity having a pulse width equal to or greater than the set width on the transmission path with a predetermined space between them, and transmit the count pulses having a pulse width equal to or greater than the set width before the first stage count pulse. and a plurality of transmitting/receiving units connected to the transmission line and obtaining DC power based on the count pulses, the output from the command unit having one polarity is set. When the width is greater than the set width, it is determined to be a count pulse and a counting operation is performed, and when the output of the opposite polarity is greater than the set width, it is determined to be a reset pulse and the count value is reset, and the count value is assigned in advance to the transmitting/receiving unit. When the transmitting/receiving unit determines that the count value matches the count value, the space between the count pulses is used between the determined transmitting/receiving unit and the command unit or between the determined transmitting/receiving units. 1. A transmitting/receiving device, further comprising a transmission means for selectively transmitting a data signal via the transmission path.