CN202710697U

CN202710697U - DMX (DataMultiplexer) 512 circuit detecting system

Info

Publication number: CN202710697U
Application number: CN 201220350251
Authority: CN
Inventors: 杨铁军
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-11
Filing date: 2012-07-11
Publication date: 2013-01-30
Anticipated expiration: 2022-07-11

Abstract

The utility model relates to a DMX (DataMultiplexer) 512 circuit detecting system consisting of a circuit detecting command sender and receiving equipment, wherein the receiving equipment is composed of a controller, a signal input end, a signal output end, a data receiving circuit, a data sending circuit, an action executing circuit and a communication circuit selector switch, the signal output end is connected with the public end of the communication circuit selector switch, the data receiving circuit is connected with the signal input end, and the normally closed contact and the normally open contact of the selector switch are respectively connected with the signal input end and the data sending circuit. After being electrified, the receiving equipment controls the selector switch to act to connect the signal output end with the data sending circuit, and the receiving equipment is cascaded in the circuit. The equipment receives the circuit detecting command sent by the former level equipment, performs a special action response and simultaneously transfers the circuit detecting command to the next level equipment. An operator judges whether the circuit has failure and where the failure locates according to whether the node performs the action response to the detecting command.

Description

A kind of DMX512 wireline inspection system

Technical field

The utility model relates to a kind of wireline inspection system, particularly relates to a kind of DMX512 wireline inspection system.

Background technology

The DMX512 communication network is a kind of parallel network, all nodes on the same circuit, all by the communication interface circuit parallel connection on the line.Its shortcoming, when the interface circuit short circuit of certain node, perhaps certain section line short can cause the communication paralysis of whole piece DMX512 circuit.At this moment need circuit is investigated, the trouble spot is found out.Because each node is in parallel on the line, any one node is short-circuited, and all is equivalent.Therefore, the investigation fault is very difficult.Even experience person is arranged, also need one by one node investigation, could finally find out the node that causes short trouble.

The utility model content

The purpose of this utility model is to provide a kind of DMX512 wireline inspection system, makes the operator for the communication failure that line short causes, and can find fast and easily the trouble spot.

The technical solution of the utility model is such, and a kind of DMX512 wireline inspection system is comprised of wireline inspection sequencing unit and the DMX512 receiving equipment that possesses circuit testing function.

Described wireline inspection sequencing unit send the wireline inspection order, meet the RS-485 electrical standard, be one group through the data of particular design.Described wireline inspection order, or its data structure is different with conventional DMX512 signal, although or its data structure meets the DMX512 standard, it is extremely low that its data are combined in the probability that occurs in the conventional DMX512 control signal, thereby the equipment that can be received is identified easily exactly.

As shown in Figure 1, described receiving equipment is by controller, data receiver circuit, and action executing circuit, data transmit circuit, the communication line change-over switch, signal input part, and signal output part consists of.Described communication line change-over switch has two or more normally opened contacts, two or more normally closed contacts, two or more common ports.The common port of described change-over switch links to each other with signal output part.The normally opened contact of described change-over switch links to each other with signal input part with data transmit circuit respectively with normally closed contact.The energising of the described change-over switch of described Single-chip Controlling or outage select among the two one to link to each other with signal output part at signal input part and data transmit circuit, for a rear receiving equipment provides signal.

Described controller at first can be selected signal output part and signal input part to disconnect, and link to each other with data transmit circuit at the beginning of powering on.In a single day described controller receives the wireline inspection order in the given time, the control action executive circuit is made one group specifically move as response, and transmit the circuit sense command to next receiving equipment via data transmit circuit.

Described controller does not receive the wireline inspection order within the predetermined time, will skip the wireline inspection program, by the communication line change-over switch, selects signal output part to link to each other with signal input part, enters normal DMX512 communication state.

The utility model can be applied to all equipment of following the DMX512 communication standard, and any DMX512 equipment adds after the wireline inspection disclosed in the utility model system, can possess the DMX512 circuit testing function.

Description of drawings

Accompanying drawing 1 is the system chart of the utility model receiving equipment part.

Accompanying drawing 2 is circuit theory diagrams of receiving equipment among the embodiment.K1 is the low-voltage direct relay, and U1 and U2 are 75176 transceivers, and U3 is single-chip microcomputer, and P1 is signal input part, and P2 is signal output part.D2 is light emitting diode.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing.

As shown in Figure 2, a kind of DMX512 wireline inspection system, its receiving equipment circuit is by a single-chip microcomputer U3 and data receiver circuit U1 (75176), data transmit circuit U2 (75176), communication line change-over switch K1, signal input part P1, signal output part P2, and some peripheral circuits such as action executing circuit consist of.The 1st pin of described data receiver circuit U1 (75176) connects the 10th pin (RXD) of single-chip microcomputer U3, the 2nd, 3 pin ground connection, and the 4th pin is unsettled, the 5th pin ground connection, the 6th pin connects the 3rd pin of signal input part P1, and the 7th pin connects the 2nd pin of signal input part P1, and the 8th pin meets power supply VCC.The 1st pin of the single-chip microcomputer of described data transmit circuit U2 is unsettled, and the 2nd, 3 pin meet VCC, and the 4th pin connects the 11st pin (TXD) of single-chip microcomputer U3, the 5th pin ground connection, the 6th pin is connected the A2 pin of news circuit switching switch, and the 7th pin is connected the B2 pin of news circuit switching switch, and the 8th pin meets power supply VCC.Described communication line change-over switch K1 is a 5V DC relay, and it has two normally closed contacts (B1, A1), two normally opened contacts (B2, A2), and two common ports (B3, A3).2 normally closed contacts (B1, A1) of K1 link to each other with the 2nd, 3 pin of signal input part P1 respectively.2 normally opened contacts (B2, A2) of K1, the 6th, 7 pin of data transmit circuit U2 (75176) link to each other respectively.Two common ports (B3, A3) of described relay K 1 link to each other with 2,3 pin of the P2 of signal output part respectively.Two winding wirings of K1 link to each other with the collector of NPN triode Q1 with VCC respectively.The grounded emitter of described triode Q1, base stage links to each other with port the 16th pin of single-chip microcomputer by a current-limiting resistance R1.The positive pole of sustained diode 1 links to each other with the collector of Q1, and negative pole links to each other with VCC.The I/O port of described single-chip microcomputer is except with above-mentioned components and parts link to each other, and also the negative pole by the light emitting diode D2 in resistance R 2 and the action executing circuit links to each other.The positive pole of described light emitting diode D2 links to each other with VCC.

Described single-chip microcomputer U3 at first passes through I/O mouth the 16th pin to high level of base stage of NPN triode Q1 after powering on, the Q1 conducting, and relay K 1 coil electricity, two normally closed contacts (B1, A1) disconnect, two normally opened contacts (B2, A2) closure.Like this, the 2nd, 3 pin of signal output part P2 disconnect with the 2nd, 3 pin of signal input part P1 respectively, then connect with the 7th, 6 pin of data transmit circuit U2 respectively.At this moment, each receiving equipment is in the cascade state on the circuit.

Afterwards, single-chip microcomputer will be attempted from the sense command of signal input part P1 receiving lines.In this specific embodiment, the wireline inspection order is by 0XAA, 0XA5,0X5A, 0X55,0XE4,0X4E, 0XEE, these 8 data of 0X44 constitute, and its data structure meets the DMX512 standard, but that its data are combined in the probability that occurs in the conventional DMX512 signal is very low, therefore with conventional DMX512 signal obvious difference is arranged, can be received easily recognition of devices.

Described wireline inspection order is sent via a DMX512 control desk.The operator can be before receiving equipment powers on when needs detect circuit, this control desk is opened and is continued the transmitting line sense command.

In a single day the single-chip microcomputer U3 of described receiving equipment receives the wireline inspection order, will transmit control signal to action executing circuit by the I/O mouth, makes it to carry out one group of specific wireline inspection response action, such as allowing light emitting diode D2 evenly and lentamente glimmer.Like this, the operator sees the D2 flicker of receiving equipment, will understand that this receiving equipment receives the wireline inspection order, and the line status before this node is normal.

Described single-chip microcomputer U3 can transmit the circuit sense command by data transmit circuit U2 to next node immediately constantly after receiving the wireline inspection order, until the wireline inspection process finishes.

If described single-chip microcomputer U3 does not receive the wireline inspection order within the time of agreement, to can not carry out aforesaid one group and specifically respond action (being that D2 evenly and lentamente glimmers), and will skip wireline inspection program partly, continue to carry out the programmed instruction of other parts.And the operator sees that receiving equipment do not make specific wireline inspection response action, just can judge that the communication line between this receiving equipment and its previous receiving equipment has fault.

When single-chip microcomputer is skipped the wireline inspection program, when removing to carry out other programmed instruction, single-chip microcomputer will be to low level of base stage of triode Q1, relay K 1 outage, it is closed that two normally closed contacts (B1, A1) recover, two normally opened contacts (B2, A2) disconnect.2,3 pin of signal output part P2 link to each other with 2,3 pin of signal input part P1 respectively by the normally closed electric shock (B1, A1) of relay.Each receiving equipment recovers the desired state in parallel of DMX512 agreement on the circuit at this moment, can receive conventional DMX512 signal.Because whole system is in the wireline inspection state, line fault causes all nodes after the trouble spot not receive the wireline inspection order, these nodes are after skipping the wireline inspection order, equally do not receive conventional DMX512 signal yet, they may receive because of line fault spurious signal, and then produce and to touch work, may not receive any signal yet, do not produce any action.

In another case, when the operator does not need circuit detected, can in the situation of not opening circuit sense command sending function, power on to receiving equipment.Receiving equipment can not receive the wireline inspection order in the designated time, will skip the wireline inspection program very soon, enters normal operating conditions.

Need to prove that more than show and described ultimate principle of the present utility model and principal character and advantage thereof, the technician of the industry should understand, the utility model is not restricted to the described embodiments.So-called action executing circuit among the embodiment is also through Simplification.In the middle of practical application, the X-axis of computer head moving lamp, Y-axis, aperture, colour wheel, pattern wheel etc. action actuating mechanism can separately or make up action, is used as the response action of wireline inspection order.The color of LED lamp, stroboscopic etc. also can be used as the response action.Etc..If receiving equipment itself has actuating mechanism or the display interface that can externally appear, just do not need to increase in addition the accepting state that a special action actuating mechanism comes the circuit sense command.If receiving equipment itself does not possess actuating mechanism or display interface, when using the utility model, just need the special action actuating mechanism that increases, with external display accepting state.Equally, as the relay of communication line change-over switch, still can be solid-state relay, perhaps other equivalent devices.The kind of single-chip microcomputer, model are of a great variety especially, should be take embodiment as restriction.What describe in above-described embodiment and the explanation is principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model can also have various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. DMX512 wireline inspection system, its characteristics are: be comprised of wireline inspection sequencing unit and receiving equipment.

2. a kind of DMX512 wireline inspection according to claim 1 system, its characteristics are: receiving equipment has a controller, a signal input part, a signal output part, an action executing circuit, a data receiver circuit independently, a data transmit circuit independently, and a communication line change-over switch.

3. a kind of DMX512 wireline inspection according to claim 2 system, its characteristics are: the communication line change-over switch has two or more normally closed contacts, two or more normally opened contacts, two or more common ports, described signal output part links to each other with the common port of communication line change-over switch, the normally closed contact of described change-over switch links to each other with data transmit circuit with signal input part respectively with normally opened contact, described controller can the switch motion of communication control circuit switching, thereby selects one to link to each other with signal output part at signal input part and data transmit circuit among the two.

4. a kind of DMX512 wireline inspection according to claim 2 system, its characteristics are: controller at first can select signal output part and signal input part to disconnect at the beginning of powering on, and link to each other with data transmit circuit, described controller is in case receive in the given time the wireline inspection order, the control action executive circuit is made one group specifically move as response, and transmit the circuit sense command to next receiving equipment via data transmit circuit.

5. a kind of DMX512 wireline inspection according to claim 2 system, its characteristics are: described controller does not receive the wireline inspection order above the schedule time, to select signal output part directly to link to each other with signal input part, enter normal DMX512 communication state.