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Table of Contents 1. INTRODUCTION...........................................................................................................................4 2. TECHNICAL DATA.......................................................................................................................6 2.1. System Parameters ................................................................................................................6 2.2. Autotag-P Base Station ATR430P series ...................................
5. INSTALLATION ..........................................................................................................................18 5.1. Base Station .........................................................................................................................18 5.1.1 General description ........................................................................................................18 5.1.2. Autotag-P Base Station Packing List .....................................................
{tc ""}1. INTRODUCTION The Autotag-P is a long range, hands free, vehicle identification system used in vehicular access applications. The configuration consists of: - a Base Station transceiver, - portable programmable Tags. - a loop detector (optional) Figure 1.1. Configuration Both the Tags and the Base Station are microprocessor controlled. This allows for increased robustness of the RF link, and flexibility with respect to coding and system configuration.
Two possible modes of operation exist: 1. A loop detector informs the Base Station of the presence of a vehicle. The Base Station then transmits a Poll signal to the Tag, which responds with an ID code. The code is verified by the Base Station, which then initiates further action (eg. opening of a barrier). 2. The Base Station continually transmits a signal, thus waking up the Tag as soon as it comes within range. This renders the loop redundant and reduces the cost of the system.
2. TECHNICAL DATA 2.1. System Parameters Configuration Encoding: One Byte Distributor / OEM code (Allows for 255 unique distributor / OEM’s). Two Byte Installer code (Allows for 65536 installers for each Distributor / OEM code). Refer to Autotag-P Programmable Station User Manual Document Number 708UM0201 for more information, 2.2. Autotag-P Base Station ATR430P series 2.2.1.
EMI/EMC Compliance: ETSI I-ETS 300 683 RF Output Power: Adjustable to maximum of +10 dBm (10 mW) Transmitter Modulation Type: 100% AM (OOK), PWM Transmit Modulation Frequency: 167 Hz to 250 Hz Transmitter Data Rate: 10 Bytes / sec Transmitter Stability: SAW resonator referenced Receive Modulation Frequency: 375 Hz & 500 Hz Receive Data Rate: 50 Bytes / sec Receiver Stability: Crystal referenced Polarisation: Elliptical 2.2.5.
2.3. Autotag-P Tag Transponder AT430P 2.3.1. Electrical Power Supply: Replaceable 3V CR2032 lithium coin cell Current consumption: Quiescent: Transmitting: Battery Life: 3 years + <5 uA <3 mA 2.3.2. Mechanical Dimensions: 120 x 32 x 11 mm Material: ABS Plastic Mounting: See Mounting Instructions (Section 4.2.2) 2.3.3. Environmental Storage Temperature: - 40°C to +85°C Operating Temperature: -30°C to +85°C Humidity: 98% max. Environmental Sealing: Sealed to IP42 Other: UV resistant 2.
2.3.5. Code System coding: 24 bits fixed User coding: 32 bit programmable No. of possible codes: Over 4 billion (232) unique codes 2.4.
3.
4. OPERATING PRINCIPLES 4.1. Radio Frequency Communications: Important concepts The Autotag-P Base Station and Tags communicate by means of radio waves. Although these are very useful, as no physical link is needed, they also have some inherent properties which need to be understood for the installation to work well. Tag Base Station Figure 4.1: Isometric view of Base Station with Tag 4.1.1.
4.1.2. Reflection and absorption The direction a radio wave travels (and how far it travels) can be affected by its environment. The wave tends to be reflected by metal surfaces and absorbed by other materials, when passing through them. At most sites there will be a fair amount of metal in the vicinity, in the form of re-inforcing bars in walls, air conditioning ducts, etc.
4.1.4. Radiation pattern The Base Station unit is designed to ensure that the RF waves are transmitted radially outwards, primarily in the direction of the front face of the unit. (In more scientific terms: there is a main lobe of radiation perpendicular to the front face.) Tags will therefore operate at maximum range when directly facing the Base Station unit. The lobe is fairly broad and will therefore work over a wider angle of coverage than simply directly in front of the unit.
Summary of important points about RF: • • • RF is unable to penetrate most metals. (For example, talking to someone in a room with metal walls over a hand held radio is impossible. RF can however go around the walls.) RF may be reflected by walls and other structures, especially those with metal reinforcing. RF becomes weaker with distance. 4.2. Autotag-P Communications Architecture Communication between the Tag and Base Station takes place as follows: As stated in the Introduction (Section 1.
4.3.2 16 Bit Installer Code As the 32 bit User Code is programmable, there is a possibility that two Tags from different installation will have the same code, hence allowing access to the other site. Therefore the introduction of the Installer code. This 16 bit code allows for 65535 Installer codes for each Distributor code. The Distributor, programs this code into the Autotag-P Base Station and Tags for the Installer, using the Autotag-P Programming Station.
will power down. Coming back into range will reinitiate the entire communication sequence. 4.5.
digits gets its own parity bit. The resultant digits together with a message header and footer are used to calculate the message check digit. 4.5.3 RS-232 – Autotag-P Point-to-point Communication Protocol Refer to section 5.3.1 for switch locations and settings. This is a unidirectional protocol where the unique code read from the Autotag-P Tag is sent out on the RS-232 transmit line.
5. INSTALLATION 5.1. Base Station 5.1.1 General description The Base Station is a robust, weatherproof device capable of being mounted outdoors and of handling wide temperature / humidity ranges (-40°C to +70°C, 0 - 98% rel. humidity). The casing is constructed of an ABS plastic, which is impact- and UV-resistant. An O-ring seal is incorporated to ensure minimal ingress of water and dust.
5.1.3. Installation The unit may be wall, pole or gantry mounted. The height of the mount should be equivalent to the average vehicle window height. The unit must be positioned so that it ‘looks into’ the vehicle. Gantry mount Boom Loop Pole and wall mount 8m max. Figure 5.2. Positioning Wall mounting: Wall mounting is possible when the wall is within the specified range of the vehicles to be monitored.
Pole or gantry mounting: 1. When mounting on a pole, refer to the dimensions and recommended minimum size on the goose neck mounting plate drawing in Appendix B. 2. A hole in the centre of the flange with a diameter of 30 mm will allow for hidden cable access. 3. Ensure that the unit faces the window area of the vehicles to be monitored. 4. Mounting instructions are the same as for the above. 5.1.4. Wiring Refer to Section 6.1 for connector Pin assignment and to Appendix A for additional information.
5.2 Tag 5.2.1. General description The Tag is an active transponder designed to communicate with an Autotag-P Base Station unit. The Tag is triggered by the Base Station when within range and transmits a unique code back. It is available in an impact- and UV-resistant nylon-based housing. It operates over a temperature range of -30°C to +85°C and has a minimum working life of 3 years. (Replacement battery CR2032 3V lithium coin cell Nortech P/No MIE040001).
5.3. Base Station Configuration Options Figure 5.4.
Refer to the Main Board Layout (Figure 5.4) for the following: 5.3.1 Base Station DIPSwitch settings: ON ON 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 SW2 SW1 Figure 5.5: Picture of DIP Switches as seen on Base Station With reference to Figure 5.
Switch 1: If an address switch is ON this represents a binary ZERO if the switch is OFF this represents a binary ONE.
If it is to operate with a triggering device, set it to ‘triggered’ and ensure the device is connected (see section 4.1.3). 5.3.2 Range adjustment: The range can be adjusted to compensate for local / site conditions and applications. This is done via the single turn adjustment trimmers on the main board (see figure 5.4). Note that both the COARSE and FINE trimmers are set to maximum range at the factory. I.e: turned clockwise to the limit. NB: Do not try to force them beyond their normal range. 5.3.
This delay is caused by the Tag going to sleep making range setting and verification a tedious operation. To speed up this task a Test Tag (708FT0214) is available. This Test Tag does not go to sleep, but responds to all valid Polls it receives. 6. Once the range has been set it is a good idea to increase it a little beyond this point to ensure that it will operate reliably under all conditions. 7.
6. CONFIGURATION 6.1.
7. CUSTOMER FAULT ANALYSIS Possible problems experienced during commissioning, and their solutions: FAULT CAUSED BY REMEDY The site regularly has several vehicles queuing to enter and exit the building. The Base Station unit detects vehicles other than the first in line, or detects several vehicles at the same time. Base Station range set too high or there is an orientation problem with the Base Station. Reduce the range so that only the nearest vehicle is detected.
b) For installations involving multiple Base Stations per site, ensure that the SYNC and GND lines (Pins 6 & 1 on CN5 screw terminal) are commoned, and that each Base Station has a different ID setting (see Section 5.3.1). FAULT CAUSED BY REMEDY Several Base Stations read a single Tag’s code simultaneously. Multiple Base Stations with the same ID. Ensure the ID settings are unique for each Base Station. The Base Station reads people walking past holding their Tags.
APPENDIX A – WIRING DIAGRAMMS AUTOTAG -P BASE STATION “WIEGAND” CONNECTION DIA G RAM WIEGAND CONTROLLER AUTOTAG-P BASE STATION 4 Data “0” In 3 Data “1” In CN7 6 Wa y 5 6 GND CN2 5 Wa y Power Supply Shield (Sc reen) Ea rth G round AUTOTAG -P BASE STATION “C lock & Data” CONNECTIO N DIAGRAM AUTOTAG-P C lock & Data CONTROLLER BASE STATION 2 Card Present In 4 C loc k In 3 Data In CN7 6 Way 5 6 CN2 5 Way GND Power Supply Shield (Screen) Earth Ground AUTOTAG-P BASE STATION “RS232” CONNECT
AUTOTAG-P BASE STATION “RS485” MULTIDROP CONNECTION DIAGRAM RS485 CONTRO LLER Maximum number of readers = 32 Note 1: Refer to RS485 Addressing in section 4.3.
CONNECTING EXTERNAL INDICATORS Vmax = 30V RED GREEN BASE STATION + Power Supply Imax = 100mA CN5-2 Green OUT Imax = 100mA CN5-3 Red OUT CN5-1 GND - DRIVING THE EXTERNAL INDOCATORS FROM AN ACCESS CONTROLLER ACCESS CONTROLLER BASE STATION CN5-5 Red IN Red OUT CN5-4 Green IN Green OUT CN5-1 GND GND 708UM0210-01 October 1999 Autotag-P User Manual Page: 32 of 33
708UM0210-01 October 1999 Autotag-P User Manual 55 min 55 min 35.7 35.7 92 98 “O ” ring se a l m a ting a re a 35.7 55 min 35.