CN1719796A

CN1719796A - Lamp light system for controlling and monitoring visual landing based on CAN bus

Info

Publication number: CN1719796A
Application number: CN 200510036149
Authority: CN
Inventors: 王东; 王小石; 杨向阳; 李伦将; 罗联昌; 胡妮玲; 李元生; 罗颖聪; 温金强
Original assignee: 95107 UNIV PLA
Current assignee: 95107 UNIV PLA
Priority date: 2005-07-28
Filing date: 2005-07-28
Publication date: 2006-01-11
Anticipated expiration: 2025-07-28
Also published as: CN100337447C

Abstract

This invention relates to a system for controlling and monitoring visual landing lights based on CAN bus, which is a distance digital signal communication system for airport visual landing lights disclosing an indoor No.0 node including a CPU, a CAN bus module, an input module, an echo module, a serial communication module and a monitor module, several outdoor nodes of branch lamp boxes are also disclosed, all modes are parallel hung on KVV armored cable via CAN drive interface.

Description

A kind of based on the CAN bus be used for control and monitoring visual landing light photosystem

Technical field

The length of airport of the present invention visual approach light to guide article is a kind of Control Network based on the CAN bus apart from the digital signal communication system.

Background technology

In recent years, along with city size constantly enlarges, near the light the airport pollutes also serious day by day, and especially when night, meteorology was complicated, the pilot was difficult to find the airport center line when landing.Airport visual approach light to guide article equipment is the flash unit that is used for approach light sys tem, by the flash of light of control photoflash lamp, as visual equipment, shows airfield runway center extended line.High brightness light is done flash of light clocklike, give the dynamic reminding of a highly significant of pilot, thereby vector aircraft finds the airport center line, smoothly approach. and there is poor anti jamming capability in this equipment in the market, error rate height, no error correction retransmission mechanism; Some nodes are made mistakes, and might cause whole network paralysis or the like deficiency.Even the equipment that has adopts Analog Circuit Design fully, do not possess network savvy, and this obviously can not the adaline field informationization, the needs of modernization construction.

Summary of the invention

The purpose of this invention is to provide a kind of based on the CAN bus be used for control and monitoring visual landing light photosystem, it can be big in electromagnetic interference situation complexity, temperature Change amplitude, thunder and lightning is concentrated, the airport of complex situations such as message transmission distance, the reliability of assurance communication.

Technical solution of the present invention is: a kind of based on the CAN bus be used for control and monitoring visual landing light photosystem, it by a host node and several minutes the lamp box node form, the indoor host computer node partly is made up of No. 0 node communication module and main control system, the lamp box node was by its communication module in outdoor a plurality of minutes, control device and photoflash lamp equipment are formed, all node hangs on the KVV armoured cable by the parallel connection of CAN driving interface, the present invention particularly No. 0 node comprises: central processing unit 1, CAN bus module 2, input module 3, echo module 4, serial communication module 5 and monitoring module 6 are formed, the central processing unit 1 main high-speed figure process chip P89C58X2FN that adopts, be responsible for the processing of data and the conversion of form, CAN bus module 2 is by CAN bus control unit SJA1000, CAN bus driver PCA82C250, high speed photo coupling device 6N137 and DC/DC power isolator B0505S-1W form, CAN bus module 2 is connected on the data summation address bus of central processing unit by controller SJA1000, the communication speed of CAN bus module 2 by self being provided with, the acceptance code register of node, check and accept mask register, bit timing, differential signal that communication is required or the like, the order that the indoor host computer node is sent is at power supply, output to the KVV cable under the complete electrical isolation of signal until a minute lamp box device node, and will divide lamp box device node fill order to return responsive state to central processing unit 1, input module 3 is made up of keyboard equipment and latch 74HC373, keyboard equipment is by after meeting latch 74HC373 in the input module 3, be connected on the address and data/address bus of central processing unit by latch again, input module 3 is controlled brightness of flash lamp and flashing speed according to the complexity of meteorology, echo module 4 is made up of LED echo device and 16 tunnels analogy derailing switch CD4067, the echo device is connected to the P1 mouth of central processing unit in the echo module 4 by 16 tunnels analogy derailing switch CD4067, thereby can in time obtain the feedback of airport external lights system by switching value and echo device, serial communication module 5 is by driven in series chip MAX232, RS232 serial line interface and 485 transducers are formed, serial line interface RS232 and driven in series chip MAX232 are connected with the serial communication port of central processing unit after linking to each other again in the serial communication module 5, realize and the external network exchanging visit.

The monitoring module 6 that monitoring module 6 is made up of the DS1232 chip links to each other with the IO mouth P1.5 pin of central processing unit 1 by cycle input/ST pin, with the key point of supervisory programme inside.

Advantage of the present invention is that it can be big in electromagnetic interference situation complexity, temperature Change amplitude, and thunder and lightning is concentrated, and the airport of complex situations such as message transmission distance guarantees the reliability of communication.

Description of drawings

Fig. 1 is a system configuration principle schematic of the present invention;

Fig. 2 is CAN bus terminals mode figure of the present invention;

Fig. 3 is a communication node module diagram of the present invention;

Fig. 4 is the conspectus that CAN bus module power supply of the present invention, signal are isolated fully;

Fig. 5 is a high speed photo coupling device isolation module B0505S-1W annexation schematic diagram of the present invention;

Fig. 6 is the DS1232 chip line connecting relation schematic diagram of monitoring module 6 of the present invention;

Fig. 7 is a communication node circuit diagram of the present invention.

Embodiment

As shown in Figure 1, whole network by a host node and several minutes the lamp box node form, the indoor host computer node is made up of No. 0 node communication module and main control system, the lamp box node was by its communication module in outdoor a plurality of minutes, control device and photoflash lamp equipment are formed, and all node hangs on the KVV armoured cable by the parallel connection of CAN driving interface.

The CAN bus adopts the differential voltage transmission signals, the KVV cable is made up of two heart yearns, respectively as high voltage (CAN_H) and low-voltage (CAN_L) line of CAN, two ends at the KVV cable couple together Line 1 and No. 2 lines with the terminal build-out resistor, as shown in Figure 2, indoor host computer is connected in parallel on KVV cable one end, and outdoor minute lamp box node evenly is connected in parallel on the cable other end with 30 meters spacing, so just constituted complete CAN communication network.

Shown in Fig. 3,6, No. 0 node comprises: central processing unit 1, and CAN bus module 2, input module 3, echo module 4, serial communication module 5 and monitoring module 6 are formed.The central processing unit 1 main high-speed figure process chip P89C58X2FN that adopts; CAN bus module 2 is by CAN bus control unit SJA1000, CAN bus driver PCA82C250, and high speed photo coupling device 6N137 and power isolator B0505S-1W form; Input module 3 is made up of keyboard equipment and latch 74HC373; Echo module 4 is made up of LED echo device and 16 tunnels analogy derailing switch CD4067; Serial communication module 5 is by serial communication chip for driving MAX232, and RS232 serial line interface and 485C transducer are formed.

CAN bus module 2 is connected on the data/address bus and address bus of central processing unit by controller SJA1000.CAN bus module 2 is provided with the communication speed (baud rate) of bus, the acceptance code register of node, check and accept mask register, the parameter that bit timing or the like is relevant with communication, the differential signal that provides signal post to need simultaneously, it is CAN bus network interface, in order to increase the antijamming capability of CAN bus node, the pin TX0 of CAN bus control unit SJA1000 links to each other through the Cathode pin of resistance R 12 with high speed photo coupling device 6N137, the output end of 6N137 links to each other with the TXD end of PCA82C250 again, the RXD end of PCA82C250 links to each other with the Cathode end of another piece 6N137 through resistance R 15, the output end of 6N137 links to each other with the RX0 end of SJA1000 again, as Fig. 4, simultaneously, in order better to realize electrical isolation, two power supply VCC and CAN_V that high speed photo coupling device 6N137 partial circuit is adopted must isolate fully, the present invention has selected small-power isolation module B0505S-1W for use, its control section power supply is connected on the VCC, and the interface power supply is connected on the CAN_V, thereby between two parts from power supply, realized electrical isolation completely on the signal, as Fig. 5, though circuit complexity like this, the stability and the fail safe that have improved node.Bus transceiver PCA82C250 is connected on output signal on the 3 km KVV cables of CAN bus.Keyboard equipment is by after meeting latch 74HC373 in the input module 3, be connected on the address and data/address bus of central processing unit by latch again, input module 3 is according to the complexity of meteorology, can control the flash luminance (low light level, middle light, high light) of photoflash lamp and flashing speed (per second once, per second secondary) by input module, the echo device is connected to the P1 mouth of central processing unit by 16 tunnels analogy switch CD4067 in the echo module 4, thereby can in time obtain the situation of airport external lights system by switching value and echo device.Serial line interface RS232 and serial communication chip for driving MAX232 are connected with the serial communication port of central processing unit after linking to each other again in the serial communication module 5, thereby can realize exchanging visit with external network, because airport equipment adopts the RS485 communication interface mostly, so behind the RS232 interface, increase a converting interface 485C, with the adaptability of expanding system.Anti-interference for further raising system, anti-locking system runs and flies, crash, central processing unit P89C58X2FN has been installed additional the monitoring module of forming by the DS1232 chip of U.S. DALLAS company production 6, play supervisory function bit to central processing unit, the IO mouth P1.6 pin of processor P 89C58X2FN links to each other with cycle input/ST pin of DS1232, key point with supervisory programme inside, when not having effective signal to arrive in the cycle that the ST of DS1232 pin is being provided with, DS1232 /RST and RST end will produce reset signal and reset to force P89C58X2FN, as Fig. 6.

SJA1000 is a independent CAN control chip of PHILIPS semiconductor company, and it must enter reset mode it is carried out the initialization setting, to determine allowing SJA1000 be in which kind of state two kinds of mode of operations before using.With No. 3 nodes is example, in just making the chemical industry work, should and check and accept mask register with the acceptance code register and be provided with as follows: ACR=" 00000011 ", AMR=" 00000000 ".This node just receives only the packet of message identification code for " 00000011XXX " like this.Simultaneously, also need baud rate, bit timing etc. are provided with.

The parallel cable of armouring has enough mechanical strengths, can ensure that the CAN communication cable does not rupture, the failure cause that corrosion etc. easily causes communication to go wrong.And armor itself can be used as the screen of CAN communication cable, ensures that the CAN bus communication is not subjected to interference from outside signals, such as with the electric supply line of CAN communication cable parallel wiring, the influence of power line etc.For the line of CAN communication cable footpath, (or the cross-section of cable amasss and is Φ 1.5mm to use GB AWG24 ²) generally can guarantee under 3000 meters distances to realize the CAN reliable communicating, the line that the CAN communication cable is buried in floor file underground directly is far longer than this diameter parameters, can realize littler communication matched impedance, when guaranteeing same CAN communication speed, realize farther communication distance, help improving the extended capability of system.2 end points installing terminal resistance of CAN communication cable can make it become the loop, effectively prevent the self-oscillation that produces on the bus and then the unlikely communication effect that influences.The parameter of terminal resistance is selected 120 Ω, the 1/4W parameter.

Because the CAN communication cable in the native system reaches 3 kms, therefore, the CAN communication speed of native system can be set at the 10Kbps parameter.CAN adopts short frame communication structure, data transmission period is short, the probability that is disturbed is low, the time that resends is short, here, we adopt 11 ID frame structures that meet the CAN2.0A standard, follow the communication data of 1 byte thereafter, just can guarantee that the data/order that each CAN node sends can arrive the destination, i.e. the CAN destination node of appointment in 2.5ms.For example, the indoor host computer node of No. 0 address sends a command to the branch lamp box device node of No. 21 addresses, issue commands to branch lamp box device node fill order from the indoor host computer node, as long as the response time of 2.5ms, it so has been a communication network that the real-time response rank is very high, be other bus communication mode, such as RS-485, Ethernet etc. are fully incomparable.

Simultaneously, 22 node devices in the CAN bus all have the address of oneself, and can set by the address toggle switch (DIP switch) on the circuit board.Therefore, can increase the CAN node device easily in the present networks, such as dividing the lamp box node device to be increased to 60, need to change any circuit hardware hardly, operating software only needs to set the newly-increased lamp box device node address of dividing, it is increased successively, different.And each device node can determine the command frame that this device node can receive according to the address number of oneself, makes this device node not be subjected to the influence of other device node orders on the bus, the speed of raising system operation, reliability.

The communications protocol of CAN bus adopts " order-response " mode of standard: the indoor host computer node is given an order, and divides lamp box device node fill order and returns responsive state.When having malfunctioning node in the bus, this fault point meeting automatic disconnection self node is connected with the CAN communication cable, can not influence the normal communication of other CAN working nodes in the network.

The concrete course of work:

(1), host node (No. 0 node) sends command message to a minute lamp box node (No. 1 node), this message comprises flash intensity;

(2), No. 1 node receives after the message, fill order, and with execution result in response message beam back node No. 0;

(3), No. 0 node receives the message that returns, and analyzes message, if carry out normally, then LED echo device is bright at the relevant position electricity, otherwise, then do not work;

(4), according to the flash of light progress, every the regular hour section, No. 0 node successively to No. 2 nodes, No. 3 nodes ... send command message.After distributing for No. 21, send so circulation to No. 1 again.

Claims

1, a kind of based on the CAN bus be used for control and monitoring visual landing light photosystem, it by a host node and several minutes the lamp box node form, the indoor host computer node partly is made up of No. 0 node communication module and main control system, the lamp box node was by its communication module in outdoor a plurality of minutes, control device and photoflash lamp equipment are formed, all node hangs on the KVV armoured cable by the parallel connection of CAN driving interface, it is characterized in that No. 0 node comprises: central processing unit 1, CAN bus module 2, input module 3, echo module 4, serial communication module 5 and monitoring module 6 are formed, the central processing unit 1 main high-speed figure process chip P89C58X2FN that adopts, be responsible for the processing of data and the conversion of form, CAN bus module 2 is by CAN bus control unit SJA1000, CAN bus driver PCA82C250, high speed photo coupling device 6N137 and DC/DC power isolator B0505S-1W form, CAN bus module 2 is connected on the data summation address bus of central processing unit by controller SJA1000, the communication speed of CAN bus module 2 by self being provided with, the acceptance code register of node, check and accept mask register, bit timing, the differential signal that communication is required, the order that the indoor host computer node is sent is at power supply, output to the KVV cable under the complete electrical isolation of signal until a minute lamp box device node, and will divide lamp box device node fill order to return responsive state to central processing unit 1, input module 3 is made up of keyboard equipment and latch 74HC373, keyboard equipment is by after meeting latch 74HC373 in the input module 3, be connected on the address and data/address bus of central processing unit by latch again, input module 3 is controlled brightness of flash lamp and flashing speed according to the complexity of meteorology, echo module 4 is made up of LED echo device and 16 tunnels analogy derailing switch CD4067, the echo device is connected to the P1 mouth of central processing unit in the echo module 4 by 16 tunnels analogy derailing switch CD4067, thereby can in time obtain the feedback of airport external lights system by switching value and echo device, serial communication module 5 is by driven in series chip MAX232, RS232 serial line interface and 485 transducers are formed, serial line interface RS232 and driven in series chip MAX232 are connected with the serial communication port of central processing unit after linking to each other again in the serial communication module 5, realize and the external network exchanging visit.