DE19934388A1 - Closed-circuit television monitoring system for rail carriage - Google Patents

Abstract

The system includes a camera set monitoring the interior of a carriage, a monitor in each control point of the carriage for the display of video- and/or control signals, and an operating field for a manual switching of the video- and/or control signals to the monitor. An image memory is provided for recording the video signals of the camera set. At least one video control modem is connected with the monitor, the operating field, and the image memory, for transmitting video- and/or control signals over low frequency connection paths, and for an event-driven switching of the video- and/or control signals to the monitor.

Description

The present invention relates to a video surveillance system system for rail cars, in particular for public transport and / or private transport deployable rail cars, such as Stadtbahn and Niederflurwagen and the like.

In the field of public transport Schie On the one hand, passenger cars are protected from injury by the passengers tongues, robberies, violent crimes and the like and at on the other hand, to protect the rail cars against damage and / or destruction by vandalism, sabotage and the same, different monitoring systems and measures know, for example, the rail car with emergency systems and extensive control or Security guards drive at least partially into the rail car With.

A disadvantage is the previously known Überwachungssyste men and measures, that despite a large amount of personnel only insufficient protection is given.

The invention is in the light of this prior art the task is based on a video surveillance system for shooting nenwagen, in particular for public and / or private Public transport deployable rail cars, such as light rail and Never derflurwagen and the like to provide, which with low personnel and technical effort a kostengün strong and comprehensive monitoring to protect passengers and passengers the rail car allows.  

The object is achieved according to the invention by a video over monitoring system for rail cars, in particular for public union and / or private public transport usable railways gene, such as light rail and Niederflurwagen and the like to grasping a kame watching the interior of a car rasatz for recording video signals, in each control desk of the Car a monitor for displaying video and / or control signals and a control panel for manual activation of Video and / or control signals to the monitor, a picture memory for recording video signals of the camera set and at least one with the monitor, the control panel and the Image storage connected video control modem for the transmission of Video and / or control signals via the car couplings of Low-frequency connection paths of several in a bandage too a train connected car and the event-dependent on circuit of video and / or control signals over Niederfre frequency connection paths and for event-dependent connection of video and / or control signals to the monitor.

The video surveillance system according to the invention allows with low personnel and technical effort a kostengün Close and comprehensive monitoring of rail cars for protection passengers and rail cars.

The cameras of the camera set, which advantageously off There are up to four cameras, drawing pictures in the form of Vi deosignal on which of the image memory, more advantageous As a digital recycle memory, over 24 hours one image per half second and camera are saved. The fact that in each control station of a rail car a Mo nitor and a control panel are present, the Schienenwa Guides about the cameras of the camera set and on the rail car watch and so the passengers before Ver injuries, assaults, violent crimes and the like, and the rail car from damage, vandalism and Sabota protect it by taking appropriate precautions transitions. promptly take appropriate action.  

In addition, by recording the video signals allows crime tracking.

Advantageously, on the part of the video control modem a Modulation or demodulation of the video signals, preferably with a carrier frequency of 38.9 MHz and an amplitude mo dulness of 90%. Furthermore advantageously be least of the video control modem, a modulation or demodulation the control signals, preferably with a carrier frequency of 132 kHz and frequency modulated.

According to a further advantageous embodiment of the inven The video and / or control signals are set to Low Fre superimposed on frequency connection paths, preferably to 100 V Low-frequency communication paths.

Advantageously, the video signals from the Vi deosteuermodems switched, the control panel on the part of Vi deosteuermodems queried and synchronized. On the part of Vi Deosteuermodems is also advantageously egg ne error handling and there are car signals as in For example, door release, light and the like, processing tet.

According to a further advantageous embodiment of the inven tion takes place a signal exchange between the Videosteuermo and the image memory via an RS232. In addition, the video control modem has an interface for an I ² C bus, via which a signal exchange between the Vi deosteuermodem and other optional devices can be done, as explained in more detail below.

In addition, on the part of the video control modem so mentioned Zugtaufe and a fretting of the coupling contacts a rail car during the Zugtaufe, preferably at 60V and 10mA.  

According to an advantageous embodiment of the invention that is Video control modem composed of three printed circuit boards, one High-frequency circuit board, a video / controller conductor plate and a supply / peripheral board.

The high-frequency circuit board has an image transmitter for 38.9 MHz, comprising a quartz oscillator, an amplitude modulator tor, a driver stage with high-frequency level adjustment, ei NEN Symmetrieübertrager and a harmonic filter, a Image receiver for 38.9 MHz comprising harmonic filters, one Precursor, a grade receiver with AGC, an amplitude modulated demodulator (AM demodulator) and a video out gang driver, and a filter set comprising a switcher for transmitting or receiving signals, a symmetry over transformer, a surge protector and a separation filter for an image carrier of 38.9 MHz and a control carrier of 132 kHz on. The functional modules of the high-frequency Printed circuit board, d. H. the image transmitter, the image receptor and the Filter set each in a separate high-frequency shielding Mug housed.

The video / controller board of the video control modem has the task of switching the video signals and the communications tion and control tasks, for example for communication and control with the image memory to handle. The communi cation becomes several in a bandage to a train realized connected car. Advantageously, as Controller uses an 80C520. To communicate with the Image memory serves the Com interface 1 in the controller. The RS232 level is achieved with the MAX202 interface driver testifies. The communication over the entire train association reali siert the controller via its Com interface 0, which in the Half-duplex operation with 1,200 bits per second via a fre Frequency modulated high frequency modem (FSK-HF modem) works. The FSK RF modem uses a frequency of 133.05 kHz for LOW and 131.85 kHz for HIGH. To realize a train It is necessary to baptize the data or signal connection  between the individual rail cars to break and the During the upgrade step by step after assigning assignments close addresses again. The separation is with ei realized a separation relay. The modem signals are the Superimposed on low-frequency connection paths. An underbreed In the context of the train baptism, only the mo refer to demsignal, d. H. the low-frequency signal is allowed there when not disconnected. For this reason, the Trennre Lais by two throttles low frequency bridged.

Furthermore, the video / controller board has a Low pass on, which prevents the modem or Bildträ interfering with the low-frequency paths. To switch the Videosi gnals become relays, preferably with gold-plated contacts used. The use of relays is advantageous because the Vi partially switched bidirectional signals and the Switching frequency is low. The video / controller ladder Furthermore, the video amplifier has video amplifiers that have a high level increase to the attenuation by overvoltage protection zeinrichtungen on the video inputs, such as the Diode capacity at overvoltage protection diodes, to compensate. The video amplifiers can be used by the controller increase the gain by 3 dB and thus the attenuation of the video camera Balances.

The supply / peripheral board has an input side d. H. from the rail car battery, a protective shell tion, and generates all the required operating voltages for the video control modem, d. H. +12 V, +10 V, +5 V and -5 V. The operating voltages are galvanic from the battery separated.

Via a so-called potential-linked "step-up converter" gets off the battery voltage, usually 24 V, a 60 V DC voltage for fritting the car coupling contacts he testifies. The frit tension is thereby during the Zugtaufe created for 1 to 2 seconds. At the same time a current of et  wa 10 mA. This measure will eventually be present Oxide layer on the contacts of the car coupling eliminated. According to a further advantageous embodiment, the Supply / Periphery PCB Optocouplers for signals such as upgrading, standstill, light on, camera and Wagenfort circuit and the like. The optocoupler inputs are designed for 24 V and can vary depending on the setting of the counter potentials via so-called jumpers to BNM or BNP.

According to a further advantageous embodiment of the inven tion, the video surveillance system connected to the video control modem emergency switch coupler, which monitors the signals of a self-sufficient emergency station system, isolated from emergency calls and directs to the video control modem, which then automatically associated with the emergency call camera of the camera set on the Monitor switches. The signal exchange between the video control modem and the emergency intercom station is carried out via an I ² C bus. Due to the emergency call station couplers, it is possible to combine already existing or planned emergency call station systems with the video surveillance system in rail cars. Advantageously, the Notsprechstellenkoppler an isolated power supply, preferably of +5 V and +10 V, a Mi krocontroller with I ² C-bus interface us frequenzmodu profiled RF modem with filter transformer on. In addition, the emergency switch advantageously has a level converter for converting TTL level to V.24 level and an interface for connecting a Prozors sors, preferably an INTEL 80 386, and a so-called MVB card for a MVB coupler on.

Further details, characteristics and advantages of the object The invention will become apparent from the following description the accompanying drawings, in which a preferred Ausfüh tion form of a video surveillance system according to the invention are shown schematically. Showing:  

Figure 1 is a plan view schematically a equipped with the inventions to the invention video surveillance rail car.

Fig. 2 is a block diagram of an inventive video control modem;

FIG. 3 is a block diagram of a high frequency printed circuit board of the video control modem of FIG. 2; FIG.

Fig. 4 is a block diagram of a video / controller circuit board of the video control modem of FIG. 2;

Fig. 5 is a block diagram of a supply / peripheral board of the video control modem of Fig. 2;

Fig. 6 is a schematic representation of a Notsprechstel stems lenkoppler of the invention Videoüberwachungssy and,

Fig. 7 is a block diagram of the Notsprechstellenkopplers in FIG. 6.

Fig. 1 shows a schematic plan view of a rail car, which is provided with a video surveillance system. In the present case, the video surveillance system consists of a camera set comprising four color cameras K1, K2, K3, K4, two video control modems VSM, one emergency call point switch NSK, one digital picture circulation memory DIVIS and monitors M and control panels BF arranged in each control station A, B of the rail car.

The pictures of the four cameras K1, K2, K3, K4 are taken from the digita 24-hour image recycle memory DIVIS with one image stored every half second and camera. The in the Leitstän A, B existing monitors are color LCD monitors, the Be control panels have three anti-reflective illuminated pushbuttons, a push-button "K +" for camera forwarding, a button "W +" to the car progress and a button "E" to terminate a Operator input.

The control panel BF and the monitor M of each control station A, B are each connected to a video control modem, wel  in turn with the digital image recycle memory DIVIS ver is bound. The respective video control modem takes over the event-dependent switching of the video signals and the Transmission of the video signals and the control signals via the Car couplings of several in a bandage to a train ver bound car. Thus, in the upgraded control room A, B every camera from every car will be displayed. The Transmission of the video and / or control signals via the cars Coupling is done by modulation and superposition on front existing 100 V train low-frequency connection paths.

The video control modem performs the following tasks:

• - Modulation / demodulation of the video signals (picture carrier fre frequency: 38.9 MHz, modulation mode AM 90%)
• - modulation / demodulation of the control signals (carrier frequency 132 KHz; Modulation type FSK)
• - Overlay on 100 V train LF communication paths
• - train composition
• - Friction of the coupling contacts during the Zugtaufe (60 V, 10 mA)
• - Communication via RS232 with the frame buffer DIVIS
• - Communication via I ² C bus with an emergency station system via an emergency station intercom
• - Optional data exchange via 12 with a MVB coupler
• - switch the video signals
• - Query and signaling of the control panel BF
• - Processing of wagon signals (upgrade control desk A, B, Door release, light on)
• - error handling.

The emergency station switch NSK shown in Fig. 1 is also connected to the video control modems VSM. The emergency station intercom intercepts the signals of a self-sufficient emergency station system, isolates emergency signals and forwards them to the respective video control modem VSM. The Vi deosteuermodem VSM is thus able to switch in an emergency, the associated camera K1, K2, K3, K4 on the monitor M.

The digital video recorder DIVIS records video signals on a shockproof hard drive with removable frame. To a damage case in the rail car, the hard drive ent to find and to find evidence or a recognition service Treatment read out in a stationary unit. To ste appropriate search help available. The picture recording depending on the operating mode in four recording phases, d. H. automatic circular image recording, manual image acquisition Drawing, picture recording after pressing an emergency call position or emergency brake and image recording by technical Events such as upgrades, door release or errors.

In the upgraded state, the driver of the rail car has the possibility of getting his camera K1, K2, K3, K4 of a car or a so-called quad image of a car on his monitor To switch M, d. H. a simultaneous presentation of the pictures of the cameras K1, K2, K3, K4 on the monitor M. Become one Quad image or a camera of a car switched manually, Thus, the image recording of the corresponding car leaves the automatic circulation recording and manual clipping teten pictures from this car are recorded. outgoing from a dark monitor, press the "K +" key on the control panel BF the camera K1 of the first car up on. If the "K +" key is pressed within 25 seconds pressed again, the camera K2 is switched on. With everybody pressing the button further scans for a camera number tet. After camera K4, camera K1 is switched back to camera. In the monitor are the camera number and the car number appears.

By pressing the "W +" key, the quad image from carriage 1 is displayed. By pressing the "W +" key again, the quad image from carriage 2 is shown. After reaching the last Wa gens train in the quad image of the first car with the next key press is switched to "W +". 25 seconds after the last press of the "K +" or "W +" buttons, the monitor will automatically go dark. The dark switching is also carried out by pressing the "E" key.

Is in a car an emergency station by call button or Emergency brake operated, so in the upgraded drive head is the Quad image of the car connected to the monitor by the Emergency station was pressed. The image is switched on while driving. By pressing the key "K +" can a single camera ge from the appropriate car be chosen. There is no automatic dark circuit of the monitor, but the key "E" should be be taken. If before pressing the "E" key another Emergency call connection is established, the associated Camera changed. This also applies to an emergency brake change. With the beginning of automatic picture switching, the digita The DIVIS Recirculating Image Recirculation leave drawing and switched on the monitor M. Pictures are recorded. After pressing the "E" key will continue with the automatic image rotation drawing.

After each upgrade of a train formation appears in the aufgerü the control station A, B was on monitor M for four seconds each Customers a quad image from each car. Based on the quad images can be detected if all four cameras K1, K2, K3, K4 in Carts are fine. With a defective camera K1, K2, K3, K4 is the image area in the monitor M black. By the inserted blinded camera number is the defective camera number determines bar.

As an indication of a defective or darkened camera in the train or vehicle group flashes the indicator light of the "E" button. at defective image recording due to disturbances of the digita The DIVIS screen flash memory also flashes the "E" key. By pressing the "W +" key, the respective defective image circulating memory DIVIS through a completely black image on the monitor M are detected. The flashing of the "E" and  the picture is switched on by pressing the button "E" or automatically ended after 25 seconds.

With an incoming door release signal is automatically the Quad image of the last car in the train bandage. The Intrusion ends ten seconds after removal of the Door release. The maximum switch-on time is 30 seconds.

Also during the automatic picture switching by techni The circular image recording is affected NEN car interrupted and opened the image records. In any case, after 35 seconds with the circulation image recording continued (so-called time-out in the picture circulating memory DIVIS).

Fig. 2 shows in a block diagram, the respective states A, B assigned video control modems VSM and their connection via low-frequency communication paths within ei Nes car and their connection to car couplings. In addition, Fig. 2 shows the connections of the video control modems VSM with the frame memory DIVIS the control panels BF and the emergency call point or the optional MVB coupler.

Each VSM video control modem is housed in a 21-inch wide 19-inch slide-in cassette or an aluminum cassette for wall mounting, with the VSM video control modem consisting of three 100-by-160-inch printed circuit boards Inside the cassette, the printed circuit boards are fixed via guide rails.The front panel connectors connect the PE surfaces of the printed circuit boards to the front panel Connection technology to the periphery is present on all three printed circuit boards on the front side.The video control module arranged inside the cassette consists of a high-frequency printed circuit board, a video / controller printed circuit board and a supply / peripheral printed circuit board, as shown in the block diagrams in FIGS . 3, 4 and 5 shown in more detail.

On the high-frequency circuit board is a 12-poli ger Wago connector X1 for the connection of Wagensigna le. The video / controller board has up to four isolated BNC video jacks X3, X4, X5, X6 and one 8-pin RJ socket X7 for the RS232 connection to the digital frame buffer DIVIS, as well as four LEDs for signaling system messages. The supply / peripheral board has a 16-pin Wago X8 connector for the supply voltage, the BF control panel, the I ² C bus, and the console detection.

The following pin assignment is used:
X1 Wago plug 12-pin:

pen signal 1 Gear up 2 standstill 3 light on 4 NF interior A (100 V) 5 NF interior B (100 V) 6 NF-Tnnenxaum screen 7 NF-ELA a (100 V) 8th NF-ELA b (100 V) 9 NF-ELA screen 10 Clutch A 11 Clutch B 12 Clutch screen

X3: ISO BNC for external video input
X4: ISO BNC for video signals from the digital video memory DIVIS
X5: ISO BNC for video signals to monitor M
X6: ISO BNC for video signals from or to the control station A, B
X7: RJ plug, 8 pin

pen signal 1 RXD (input) RS232 2 TXD (output) RS232 3 GND 4 5 6 7 8th P3.2 (GND = monitor mode)

X8: Battery plug, 16 pin

pen signal 1 Infeed +24 V (BNP) 2 Infeed 0V (BNM) 3 earth 4 Bridge for A-head recognition (GND) 5 Bridge for A-head recognition (DE) 6 I ² C bus (SDA) 7 I ² C bus (SCK) 8th I ² C bus (INT) 9 I ² C bus (GND) 10 Control panel BNM (OV) for buttons / lamps 11 Control panel OPTO-DE for push-button K + 12 Control panel OPTO-DE for pushbutton W + 13 Control panel OPTO-DE for pushbutton E 14 Control panel relay DA for lamp K +; W + 15 Control panel relay DA for lamp E 16 reserve

Connection cable X7 / frame memory DIVIS RS232

Fig. 3 shows a block diagram of the structure of a high-frequency circuit board of the video control modem VSM. The high-frequency printed circuit board consists of three interconnected function modules, an image transmitter, an image receiver and a filter set. The image transmitter is designed for 38.9 MHz and has a quartz oscillator, an amplitude modulator, a high-frequency level driver stage, a balun and a harmonic filter. The image receiver is also designed for 38.9 MHz and has a harmonic filter OFW, a high-frequency pre-amplifier, a grade receiver with AGC, an AM demodulator and a video output driver. The filter set has a switch for transmitting / receiving, a balun, over-voltage protection and a separation filter for 38.9 MHz (image carrier) / 132 KHz (control carrier) on.

The individual functional modules of the high-frequency PCB each in a separate high-frequency Ab arranged umbrella cup.

Fig. 4 is a block diagram of a video / controller printed circuit board of the video control modem VSM. The task of the video / controller board is to switch the video signals and handle the communication and control tasks with the controller. The COM interface 1 in the controller is used for communication with the DIVIS frame buffer. The RS232 level is generated with an interface driver MAX202. The controller realizes the communication over the entire train set via its COM interface 0, which operates in a half-duplex with 1200 bits per second via an FSK-HF modem.

The FSK RF modem uses a frequency of 133.05 KHz for Data = LOW and a frequency of 131.85 KHz for Data = HIGH.

As already explained, it is necessary for the realization of Zugtaufe that the data connection between the cars of a train formation are interrupted and this when upgrading the car to a train association gradually to assigning assignment addresses are closed again. This separation takes over in Fig. 4 with "LOOP" gekennzeich designated relay. The modem signal of the FSK RF modem is superimposed on the 100 V NF connection path. An interrupt refers only to the modem signal. The 100 V AF signal is not disconnected. For this reason, the "LOOP" relay is bridged by two throttles low frequency, as shown in Fig. 4 Darge. In Fig. 4 in front of the ELA connection, a 100 V low frequency connection with the pin assignment X1, PIN 7, 8 and 9 is a low pass with 2 × 22 mH and 22 nF arranged ver prevents that the modem or image carrier disturb the ELA system.

For switching the video signals, relays with gold-plated contacts are used. Since the video signals are partly bidirectional switched and the switching frequency is low, the use of relays makes sense. The dargestell th in Fig. 4 video amplifier have a treble boost to the Dämp tion by the diode capacitance at the overvoltage protection diodes and the video inputs compensate. The amplifiers, which, as shown in Fig. 4, receive their video signal from the head X6 or drive to the head X6, can increase their amplification from the controller controller via the RX / TX-GAIN signals by 3 dB and thus the attenuation of the video cable between compensate for the travel heads X6.

Fig. 5 shows a block diagram of the structure of a versor supply / peripheral circuit board of a video control modem VSM. The circuit board is provided on the input side X8, pin 1, 2, 3 with egg ner protection circuit 5 and generates the operating voltages +12 V, +10 V, +5 V and -5 V for the video control modem. The voltages are galvanically separated from the input side (X8, pin 1, 2, 3) car battery (24 V) ge.

By means of the non-floating step-up converter (24 V / 60 V) shown in FIG. 5, a 60 V direct voltage is generated from the battery voltage of 24 V for fritting the carriage coupling contacts. The frit tension is applied for one to two seconds during the baptism. In this case, a current of about 10 mA flows. By this measure, an optional oxide layer is removed on the contacts of the car coupling. The excitement of K10 causes the frit voltage to be released. With K20, the coupling contacts via which the frit current flows are loaded with a resistor. The controller of the video / controller board shown in Fig. 4 ensures that it is fed from one coupling side (carriage n) and loaded from the other side (carriage n + 1).

Furthermore, the supply / peripheral circuit board, as shown in Fig. 5, optocoupler for the signals Rev, boxes, standstill / door release, light on, button K +, button W + and button E on. The optocoupler inputs are designed for 24 V and can switch to BNM or BNP via jumper, depending on the counter potential setting.

In addition, the supply / peripheral circuit board has Relay contacts K30 and K40 for the light signals in the Ta star K + and W + (X8 pin 14) and the button E (X8 pin 15) on.

Fig. 6 shows schematically an emergency switch NSK, which is connected to the video control modem VSM for signal exchange via an I ² C bus. The emergency call point coupler is the link between a self-sufficient Notsprechstel lensystem and the video control modem VSM. The emergency stations koppler hears the frequency-modulated (FSK-modulated) Si gnal- or data traffic on an emergency station Hochfre frequency bus with and isolated from the signals that signal a voice connection. The emergency call point has for this purpose an I ² C interface, which, as already explained, is connected via an I ² C bus to the I ² C interface of the video control modem VSM. The voice connection signals isolated by the emergency intercom switcher NSK are transmitted via this interface to the video control modem. The signals are transmitted in the form of data telegrams via the I ² C bus, the video control modem VSM being the master and the emergency switch unit NSK being the slave. The slave can process a maximum clock rate of 4.8 KHz. In this case, an address byte and 18 bytes of data are transmitted bidirectionally between the video control mode VSM and the emergency station switch NSK. The telegram allocation of the I ² C interface is structured as follows:

Data direction from the emergency call point coupler to the video control to:

• - Organization in status byte (0Dh)
  

PF = 1 corresponds to PC104 failure
DS = 1 corresponds to transmission of old PC data

• - Meaning of the emergency call identifier (0Eh)
  

The station status inquiry takes place only for those in the Train crew and working faultless passenger STATION.

• - Meaning of emergency stations, door numbers and car numbers (0h, 10h)
  Door number is the physical door number in the car to which the door station is addressed.

Car number is the car number in the train. The leading car has the number 1 of the 1st pulled car. The number 2 and so on

• - Meaning of the ASCII characters in the emergency stations, command type (11 h)
  

A speech connection is clenched by 31 h and 34 h. And triggered by pressing the microphone unit.

The data bytes (00h to 0Ch) are provided only if the emergency switch NSK has a connection to the MVB bus via the PC104 CPU and the data byte (0Dh) has the bit D0 equal to 0. If the bit "PF" in the data byte (0Dh) equals '1', the signals must be

• - Door release
• - Light on

read from the vehicle signals via the digital inputs become.

Data direction from the video control modem to the emergency call point coupler:

The block diagram shown in Fig. 7 shows the structure of the Nutzsprechstellenkopplers NSK the function modules for egg ne isolated power supply PS for +5 V and +10 V, a microcontroller with I ² C-bus interface as a slave, an RF-FSK modem with Filter transmitter and a TTL / V.24 level converter PK, a PC104 female connector, a PC104 SPU with an 80 386 processor from INTEL and a MVB PC104 card has.

The signal exchange between the video control modem VSM and the video memory DIVIS takes place in the form of telegrams via the RS232 interface, as shown in FIG. 2 and already explained. The telegram traffic is structured as follows:
Basic program structure:

• - Trigger character (lower case, ASCII)
• - Data characters (ASCII, only numbers and capital letters)
• - Return, CR (0D hex)

coupler structure:

• - Master is the video control modem
• - Slave is the video processor
  

To define the signal exchange in the form of telegrams between the control modems VSM of the control stations A, B of each car, an RF modem is used. This RF modem requires that each transmission begin with the sequence FFh, AAh. The telegrams have the following structure:
FFh, AAh, (data), (CR), (CRC).

The data is always ASCII characters and starts with a small letters. The modem switching signal Rx / Fx must still 30 msec to 0 after the end of the last stop bit. The CRC is an exclusive or checksum.

The upgraded video control modem VSM is master, the others Video control modems connected in a bandage to a train A car is a slave.

It is possible to differentiate between two types of telegrams. On the one hand telegrams for all participants. Partly subscriber-selective telegrams.

The telegrams for all participants are traced three times the sent. They are not acknowledged by the participants. The subscriber-selective telegrams must be from the slave working video control modem within 100 msec acknowledged become. The slave video control modems VSM sen the only positive receipts. When working as a slave Video control modem VSM does not understand the incoming telegram has, there is a receipt. In the absence of a receipt like derives the video control modem VSM working as a master Telegram three times.

The following telegrams are provided:  

Reset Telegram

It is a telegram for all participants. The Resettelegramm forces all video control modems VSM in the Reset state. The data to be transferred ("a") will be sent three times.

Telegram on status call during the train baptism

This telegram becomes the next video control message addressed before it receives its assignment address. The data ("s", "0", "0") of the master ar the video control modem VSR sent and the angepro The slave video control modem VSM sends fol return answer data ("s", "0").

Telegram for the transmission of the assignment address

For this purpose are transmitted as data "z", FK, W where FK the Control room and the value 1 indicates the control room in motion direction (in the first car there sits the driver) and 2 the Control station against the direction of travel features. W is the logical car number in a train, the contents 1 the upgraded car, d. H. with a driver Henen car designated and 2 to n the erstgezogenen car up to a maximum of n. The answer is a telegram with the response data "s", "0" returned.

Telegram with cyclic status request

A telegram is transmitted with the data "s", FK, W (explanation see above). In response, in each case a telegram is sent back with the response data "s", ST, NB, FZ, NS, where ST is a status identifier and can contain the values b0 to b3, where b0 to b3 have the following meanings:
b0: everything o. K.
b1: Camera malfunction / collective fault
b2: frame memory error
b3: control station identification (0 = A, 1 = B)

NB indicates the status of the emergency brakes of each car and can take values from b0 to b3, where the values b0 to b3 have the following meaning:
b0: Emergency brake 1 pulled
b1: emergency brake 2 pulled
b2: emergency brake 3 pulled
b3. Emergency brake 4 pulled.

FZ identifies vehicle signals from the MVB coupler. Values from b0 to b3 can be taken, whereby the values b0 to b3 have the following meaning:
b0: door release,
b1: light on
b2: free
b3: free

NS indicates the status of the actuated emergency stations and can take values from 1 to 8. The values 1 to 8 ent speak the respective doors 1 to 8 of the corre car.

Telegram for the command to carry out the frying

In the process, the video control works as a master ermodems VSM sent as data "f" three times. response data from working as slave video control modems not mandatory.

Telegram for commands for setting the video gain and for switching the video relays. At the same time a telegram will be sent with the data "v", FK, W, V1, V2, V3, RT, WA, WB, VE of as master working video control modem transfer. FK be draws, as already explained above, the respective Leit and W was the logical car number in the train.  

V1 denotes the output from the RF image receiver (LP2, IC5), V2 the video driver to the image transmitter (LP2, IC6) and V3 the Video driver from the video memory DIVIS or an exter NEN video driver (LP2, IC8). V1 to V3 can be used as In Hold the values H or T for a high gain or a take deep reinforcement. The difference is between gain high and gain deep 3dB.

RT switches the video signal between receiver and transmitter. R determines the direction of reception and T the transmitter tung.

WA and WB relate to the video selection of the control station A or of the control station B. The values K and V can be used be men. K connects the video transmitter or receiver with the counterhead (bidirectional operation). V connects the Video transmitter or monitor with cart-specific video sources (camera set, camera K1 to K4).

VE: Toggles the cart-specific video sources the video memory and the external video input (at for example, rearview mirror function). V switches the Vi video signal from the video memory and E the external video entrance.

The answer is a telegram with the response data "s", Transmit "0".

Telegrams for commands from the Master Vi deodorant modem VSM for the carriage-specific image circulation memory video processors and the BF panel

In this case, a telegram with the data "b", W, M, Q via carry. W designates, as already explained above, the logi wagon number in the train. M denotes the mode of Camera connection to the monitor M. The In consider K to be an automatic camera lockup technical events, N for an automatic camera  circuit when pressing an emergency station or a Emergency switch and T for an automatic camera circuit by alarm buttons and the like and M for a manual camera activation transmitted by the driver. Q in the telegram the source indicates, d. H. each up switched on camera. At a value of Q = 0 becomes a quad picture of four cameras K1 to K4, at values from Q = 1 to Q = 4 one image of the camera K1 to K4 on the monitor switched. At a value of Q = C will be on the picture recirculation memory switched back, which corresponds to the normal state speaks.

The answer is a telegram with the response data "s", Transmit "0".

As slaveadresse only the car number is angege ben. Which of the two video control modems VSM of the car executes the command depends on the respective control stands from. The frame buffer is always in the Leit Stand A of a car arranged.

After switching on the supply voltage all Liche relays still remain in the fallen state. After an EPROM / RAM check and initialization, the following basic state is set:
COM 0: 1200, N, 8, 1
RF modem: RX
COM 1: 9600, N, 8, 1
I ² C bus: Off, STA, +5 VV, SCK, +5 VV
Exciting "LOOP" relays: The RF connection to the car coupling is thereby interrupted.
TX, RX, VP-GAIN and MONOFF: 1
Spring storage: delete
Additional image: delete

The upgraded video control modem VSM is on the HF control bus switched as master. The upgrade is done by a LOW Signal detected. The master video control modem receives the control station identification 1. After a waiting period of two Seconds the above-described Resettelegramm is sent. After another two seconds, the train is set up. The master video control modem sends the above explained telegram for a status call during the train Baptism, which belongs only from the counter control in his own car can be. This control station acknowledges with a telegram with the response data "s", "0". In the next step, that gets Video control modem in the counter-current the tele explained above gram for the transmission of the assignment address ("z", "2", "1", d. H. Opposite direction, carriage 1). The video control modem quit transmits this with a telegram with the response data "s", "0" and closes the "LOOP" relay. The master working Video Control Modem will then resend the above Telegram for the status call during the train baptism with the Data "s", "0", "0", this telegram being the base address of the Baptized Video Control Modem VMS. If a second Car is hitched, can now only the video control ermodem in the second car in the direction of travel füh len. This then logs in with a telegram with the Data "s", "0". Thereafter, the working as a master Vi sends deosteuermodem VSM a telegram for the transmission of the assignment address as explained above. It has as Master working control modem previously FK to the value of 1 geto and W increased by 1 ("z", "1", "2", ie ride direction, car 2). This will continue until you see yourself to the telegram for the status call during the train baptism no video control modem logs in anymore.  

The determined train band (train length) is in as master ar stored video control modem stored. The master's job The video control modem then transmits the telegram guiding the frictional engagement of the vehicle clutch ("f", three times ge sends). Each video control modem VSM with FK = 1 (control console in Direction of travel) switches over relay K20 for two seconds a load resistor. Each video control modem with FK = 2 (Head against the direction of travel) switches for two seconds via the relay K10 the frit voltage. While K10 or K20 are energized, the "LOOP" relay is opened. After this Telegram for carrying out the fritter is waiting as master working video control modem for three seconds. In this Time, the "LOOP" relays are closed and the image Transmitter receiver activated. This video control modem VSM with FK = 1 switches to TX and TX GAIN = 0. Each video control message The VSM with FK = 2 switches to RX and RX GAIN = 0, which is one Amplification by 3 dB corresponds. For both video control modems of a car, the relays WA, WB stand on K.

This results in the following switching matrix for the video levels:
TX GAIN = 0 → gain 0 dB
TX GAIN = 1 → gain -3 dB
RX GAIN = 0 → gain +3 dB
RX GAIN = 1 → gain 0 dB
VP GAIN = 0 → gain +3 dB
VP GAIN = 1 → gain 0 dB
MONOFF = 0 → Monitor on
MONOFF = 1 → Monitor off

Each video control modem with control station identifier FK = 0 sends its car number to the video memory DIVIS. The video control modem operating as a master sends cyclic status queries corresponding to the above-explained telegram for cyclic status polling ("s", FK, W) and checks whether all image circulation storages DIVIS as o. K in all carriages of the train association are in control station A. have reported. Unless this condition is met within four minutes of the upgrade, the quad image launch of the car with the smallest allocation number is started. In this case, a telegram for commands from the working as a master video control modem for the carriage-specific video memory video processors and the control panel BF is sent. Four seconds later, the next car follows. Normally the following will be sent:
"b", "1", "K", "0" for the first car and "b", "2", "K", "0" for the second car, etc.

Provided that a video control modem VSM on a cyclic Sta tusabfrage with three repetitions no longer reports, sends the video control modem working as a master explained above reset telegram ("a", sent three times) and builds the train reconnected with frying. This process starts for Video control modem only once, unless it reboots equipped. The master video control modem VSM switches on the monitor of the corresponding car (MONOFF = 0). Receives the master video control modem VSM on a cyclic status inquiry a receipt with the Infor mation "light on", turn this on for thirty seconds, which are nachträgerbar, the control panel lamp in the control panel BF.

By pressing the keys "K +", "W +" and "E" the correc parameterized telegrams for commands from as master working video control modem for the dare-specific image circulating video processors and the BF control panel ent transferred to a manual image activation. A Emergency station operation or emergency brake operation, which by the answer telegram according to the above Telegrams for commands for setting the video gain is detected for switching the video relay, switches in the driving opened a quad image of the affected car. The picture  Connection by emergency or emergency brake has it highest priority. More automatic picture switching as already explained, in the event of sabotage, errors, retrievals or door release.

To execute the Aufschaltbefehls that already above he telegram was refuting orders for the master Vi Control modem for the cart-specific image circulation memories and the control panels BF receive ("b", W, M, Q).

When exchanging signals for communication between the video control VSM and the emergency switch NSK or the MVB coupler the video control VSM utilizes the data door release, light on, emergency brake 1 to emergency n, PC104 or MVB failure, emergency call number, Notsprechstel lentürnummer, emergency station car number and Notsprechstel lenbefehlsart, which are transmitted via the I ² C bus from the emergency call coupler NSK or MVB coupler. The exact structure of these telegrams is already explained above in connection with the interface allocation between the video control modem VSM and the emergency call point switch NSK.

If the signal PC104 or MVB failure = 1, the Information door release and light One of the corresponding read the digital inputs. The video control modem VSM to be used data from the emergency intercom NSK or from the MVB coupler are as response telegram to a zy cliched status request sent. It must be for the answer to a cyclic status inquiry in the emergency response information about the operation of each door ei be isolated from a car. This will be the emergency stations flag checked for "a" and "b". Where "a", that all existing voice connections are deleted. The Parameters after indicator "b" are only evaluated if the car number matches the own car number Right.  

As already explained above in connection with the Schnittstellebele tion of the video control modem VSM and the Notsprechstellenkopp coupler NSK with respect to the I ² C bus, begins be existing emergency speech connection with the command type 31 h and en det with the command 34 h. Parameter 1 tells the physical door number of the respective car.

Is set to a cyclic status query with a set Error bit reacts, then from this car the quad image for switched on for a maximum of 25 seconds. At the same time the flashes Button "E" with a flashing frequency of about 1 Hz. The flashing the key "E" and the quad image can also be changed beforehand by beta to end the "E" key. This error then applies as acknowledged, but remains in the fault memory until the next saved. Error messages are only after Expiration of 4 minutes after the first time a cyclical Status query sent or received in as master ar stored video control modem or for transmission released to the MVB bus.

The video control modem VSM offers three diagnostics for diagnosis surrounded:

Diagnostic LEDs

These LEDs signal the most important operating states.

Text information on the FSK RF bus

This information may be in the vehicle with an RF modem, a laptop and a terminal program are read.

monitor mode

This serves for the diagnosis at the test station.

Claims (25)

1. Video surveillance system for rail cars, in particular for use in public and / or private transport Rail cars, such as light rail vehicles and low-floor cars and the same, comprehensively overwhelming the interior of a car camera set for recording video signals, in each Console of the car a monitor for displaying video and / or control signals and a control panel for manual opening circuit of video and / or control signals to the monitor, an image memory for recording video signals of the Ka merasatzes and at least one with the monitor, the control panel and the video memory connected video control modem for over transmission of video and / or control signals via Niederfre frequency connection paths and for event-dependent connection of video and / or control signals to the monitor. 2. Video surveillance system according to claim 1, wherein the part of the Video control modems a modulation / demodulation of Videosi signals, preferably with a carrier frequency of 38.9 MHz and an amplitude modulation of 90%. 3. Video surveillance system according to claim 1 or claim 2, where on the part of the video control modem, a modulation or De modulation of the control signals takes place, preferably with a Carrier frequency of 132 KHz and frequency modulated. 4. Video surveillance system after one or more of the Proverbs 1 to 3, where on the part of the video control modem, the Vi deo and / or control signals on low-frequency connection superimposed, preferably on 100 V low-frequency Connection paths. 5. Video surveillance system after one or more of the Proverbs 1 to 4, where on the part of the video control modem, the Vi deosignals are switched.   6. Video surveillance system after one or more of the Proverbs 1 to 5, wherein on the part of the video control modem Be is queried. 7. Video surveillance system after one or more of the Proverbs 1 to 6, wherein the part of the video control modem Be is synchronized. 8. Video surveillance system after one or more of the Proverbs 1 to 7, where on the part of the video control modem Wagensi gnals are processed. 9. Video surveillance system after one or more of the Proverbs 1 to 8, where on the part of the video control modem Error processing takes place. 10. Video surveillance system after one or more of the Proverbs 1 to 9, where on the part of the video control modem Christening takes place. 11. Video surveillance system after one or more of the Proverbs 1 to 10, where on the part of the video control modem Friction of the coupling contacts of the car during a train baptism, preferably at 60 V and 10 mA. 12. Video surveillance system after one or more of the Claims 1 to 11, characterized that a signal exchange between the video control modem and the Image memory via an RS232 connection takes place. 13. Video surveillance system after one or more of the Proverbs 1 to 12, characterized by a with the video control modem connected emergency station intercom, which the signals of a self-sufficient emergency call system from it, hears emergency signals isolated and to the video control modem directs, which then one to the emergency call associated Ka the camera set switches to the monitor.   14. Video surveillance system according to claim 13, wherein a signal exchange between the video control modem and the emergency intercom station is done via an I ² C bus. 15. A video surveillance system according to claim 13 or claim 14, wherein the emergency station switch has an MVB coupler and a signal exchange between the video control modem and the MVB coupler via an I ² C bus. 16. Video surveillance system after one or more of the Claims 1 to 15, characterized that the video control modem is a radio frequency unit, a Vi deo / controller unit and a supply / peripheral includes. 17. Video surveillance system according to claim 16, characterized characterized in that the high-frequency unit a Image transmitter, an image receiver and a filter set on has. 18. Video surveillance system according to claim 17, characterized in that the image transmitter with a Trä frequency of 38.9 MHz and a quartz oscillator, an amplitude modulator, a driver stage with Hochfre level level adjustment, a balun and a Has harmonic filter. 19. Video surveillance system according to claim 17, characterized in that the image receiver with a Carrier frequency of 38.9 MHz works and a harmonic fil ter, a pre-stage, a grade receiver with AGC, a AM demodulator and a video output driver. 20. Video surveillance system according to claim 17, characterized characterized in that the filter set a Umschal ter for send / receive, a balun, a  Overvoltage protection and a separation filter for 38.9 MHz / 132 KHz having. 21. Video surveillance system according to claim 17, characterized characterized in that the image transmitter, the Bildemp catcher and the filter set each with a high-frequency Ab screen device are provided, preferably in a sepa high-frequency shielding cups are housed. 22. Video surveillance system according to claim 16, characterized characterized in that the video / controller unit a controller for handling communication and control Tasks, one with an interface of the controller ver Tied FSK RF modem for frying in a train baptism and video amplifier to compensate for attenuation at the Has video inputs. 23. Video surveillance system according to claim 16, characterized characterized in that the supply / peripherals Unit on the input side has a protective circuit, the Operating voltages for the video control modem, preferably +12 V, +10 V, +5 V and +5 V produces a potential-tied Step-up converter for generating the fritter voltage, preferably Example of 60 V DC voltage at about 10 mA, optocouplers for the signals upgrade, standstill, light on, button W +, Ta ster K + and pushbutton E, as well as relay contacts for light signals in connection with the keys W +, K + and E. 24. Video surveillance system according to claim 23, characterized characterized in that the operating voltages for the Video control modem galvanically isolated from the car battery are. 25. Video surveillance system after one or more of the Claims 1 to 24, characterized that the image memory is a digital circulation memory with a Storage capacity of 24 hours when recording from  one image per 0.5 second of up to four, preferably from is up to eight cameras of a camera set.