PRX4 & PRX4SERL User Manual
Contents
1. cope PRX4 amp PRX4SERL Four Zone Receiver Decoder User Manual Scope Communications UK Ltd Quantum House Totnes Devon TQ9 5AL England Tel 01803 860700 Email sales scope uk com Ref RX4USER Issue 1 PRX4 amp PRX4SERL Four Zone Receiver Decoder PREFACE Important Installation Information It is the purchasers responsibility to determine the suitability of this equipment and its derivatives for any given application Scope cannot give specific advice in this manual as each use will require independent evaluation Scope has wherever possible employed extra safeguards to monitor the system s performance Certain system installations operational requirements or budgets may however limit the effectiveness of these safeguards Again the suitability of the system for any given application must therefore be decided by the installer and their customer relative to the application and risk Good working practice dictates that a suitable system installation log must be generated together with a record of the dates when the system has been manually checked with the aid of signal strength meters etc enabling the system performance to be compared with the original installation data For UK equipment Scope has no control of the use and application of the frequencies issued by OFCOM Some equipment that is licensed may have greater protection than other equipment which is operated on a WT Act License Exempt basi2. 9600 E amp OE Scope s policy is one of continuous development and specifications are subject to change without notice Ref RX4USER Page 8 of 8 Issue 1
3. relay on the PRX4 to energise and light the front panel LED for that relay Opening a zone input on the transmitter will cause the corresponding PRX4 zone relay and LED to de energise All relays have N O N C and Common connections available on screw terminal blocks located on the main circuit board see Diagram 1 The maximum contact rating of each relay is 0 5A 125V ac 1A 60V dc If necessary the unit can be reset by depressing SW1 through the hole provided on the lower endplate see Diagram 1 This will de energise all relays and return the system to its initial power up state PRX4SERL up to four capcode ranges either alphanumeric or numeric can be used to latch four corresponding relays and their respective front panel LEDs The relays can be globally reset either using a preset over the air capcode or by depressing the Reset switch Optional software is available which only latches the relays for 3 seconds for 1200 baud TX systems only Ask our technical sales team for further details The PRX4SERL has the added facility of an RS232 serial port providing a data logging function text only The unit can optionally be configured to send Scope protocol for onward transmission using a Scope transmitter on a different frequency Power input for both units is 12V dc 0 5A via the blue latching connector provided Section 1 Installation Certain precautions in siting of the unit apply As with all radio equipment attention
4. ace using suitable screws fitted through the 4 75 mm holes provided in the chassis plate Check that the chassis plate does not bend and that the screws do not snag or pinch any internal cables Warning Do not use the chassis plate as a template for drilling the holes into the wall Hammer drills may irreparably damage the quartz crystals on the printed circuit boards Connect the antenna to the unit via the BNC connector located at the top of the housing If the antenna is an external type or an antenna which is separate from the PRX4 unit itself care should be taken to ensure that certain installation criteria are met as detailed below Some major points to consider when installing equipment 1 Never install antennas near or adjacent to telephone public address or data communication lines or overhead power cables 2 Avoid where ever possible running antenna coax alongside other cables and avoid kinks and coils Pre terminated cable should not be altered 3 Avoid mounting the receiver in the immediate vicinity of telephone exchanges or computer equipment 4 Always use 50 ohm coaxial cable between the antenna and the receiver If cable runs exceed 5 metres always use low loss 50 ohm cable such as RG213 or UR67 to a maximum of 15 metres Coaxial cable intended for TV Satellite or CCTV installations is normally 75 OHM and therefore totally unsuitable for any receiver installation manufactured by Scope 5 Also remember that t
5. efective parts free of charge This does not include where the adjustments parts and repair are necessary due to circumstances beyond the control of Scope including but not limited to fire or other casualty accident neglect abuse abnormal use or battery leakage damage WARNING No User Serviceable Parts Celui ci ne contient aucune piece pouvant etre reparee par l utilisateur Alteration or modification to any part of this equipment without the prior written consent of the manufacturer will invalidate all manufacturer approvals and warranties No adjustments can be undertaken except by qualified and licensed persons as authorised by Scope This product complies with the essential requirements of the R amp TTE Directive 1999 5 EC Copies of the Declaration of Conformity covering this product can be obtained from Scope at Quantum House Steamer Quay Totnes TQ9 5AL United Kingdom Do not discard At end of life this equipment must be sent to an authorised waste treatment centre Contact Scope at the above address for further details a vo Scope Communications UK Ltd 2005 All Rights Reserved Ref RX4USER Page 3 of 8 Issue 1 PRX4 amp PRX4SERL Four Zone Receiver Decoder Overview The PRX4 is a POCSAG receiver decoder equipped with four change of state relays It is designed to operate with the Scope Pagetek and Digilink transmitters Closing a zone input on the transmitter will cause the corresponding zone
6. he performance of the system will be affected by the type of material the unit is mounted on and its surroundings The following is a list of materials that this receiver will be adversely affected by if mounted on or if mounted in close proximity to a Foil back plasterboard b Metal mesh or wire reinforced glass Cc Metal sheeting large mirrors or suspended ceilings d Lift shafts All of the above can reduce the ability of the receiver to perform its functions 6 The circuit boards within this equipment may be harmed by Electrostatic Discharge ESD Installers should ensure that both themselves and the system s chassis are grounded before beginning any installation and should ensure that adequate anti static procedures are adhered to at all times Ref RX4USER Page 5 of 8 Issue 1 PRX4 amp PRX4SERL Four Zone Receiver Decoder Fit the required switch cables to the appropriate relays These are labelled Zone 1 to Zone 4 Terminals are available on each relay for Normally Open Normally closed and Common Finally connect the blue latching power connector to a 12V dc 0 5A power supply observing the correct polarity as shown in diagram 1 Where the unit has been ordered as a PRX4SERL with the serial port enabled the 9 way D connector is used to connect the unit to a serial printer or PC for data logging purposes or to a Scope transmitter for a repeater application The serial port configuration is 9600 baud N 8 1 A sta
7. must be given to the aerial selected and where the unit is mounted in relation to the transmitter being monitored If the unit is to be used with a second transmitter it should be sited as centrally as possible within the secondary area to be covered although it must of course be within adequate distance of the originating transmitter The unit should be at least two metres away from any transmitter It is therefore essential that adequate signal reception is checked before fitting the unit in the desired location Using a Yaesu VR 120D Communications Receiver programmed to the required frequency a signal strength of 5 or greater is deemed to be sufficient to provide a reliable consistent link Readings below this level may lead to poor reception in adverse atmospheric conditions Ranges of up to 1 mile can be achieved except where signal paths are severely obstructed due to reflections or physical obstacles in the way Such conditions may be experienced where there are a large number of metallic structures around the site or where the receiver is sited in a hollow i e below the level of the transmitter or it s aerial available from Scope contact our sales dept for full details Ref RX4USER Page 4 of 8 Issue 1 PRX4 amp PRX4SERL Four Zone Receiver Decoder To mount the unit on the wall remove the two screws from the front of the case and separate the cover from the baseplate The baseplate should be fixed to an even wall surf
8. ndard serial cable null modem is required Operation PRX4 The unit is factory programmed as a simple four zone change of state system for operation with the Scope Digilink amp Pagetek transmitters only When zone 1 on the transmitter is shorted zone 1 relay on the PRX4 will energise and latch When zone 1 on the transmitter is opened the zone 1 relay on the PRX4 will de energise The same applies for zones 2 3 and 4 and their corresponding relays The serial port is not used on this model Power input is 12 to 13V dc 0 5A via the blue connector provided See diagram 1 for the correct polarity connection PRX4SERL This unit utilises ostensibly the same hardware as the PRX4 but has different firmware which facilitates the following features 1 there are four configurable capcode ranges which can be specified for activating each relay Each range can be specified as either numeric or alphanumeric Sending a capcode within the set range will latch the relevant relay and light the corresponding onboard LED 2 An on board sounder can be configured to beep every time data is received 3 Serial output is available on the 9 way D Connector This can be specified to output text only for connection to a printer or PC or Scope protocol for onward connection to another Scope transmitter for use as a repeater 4 the receiver will decode POCSAG transmissions sent at 512 baud or 1200 baud not both This must match the transmit
9. s The supply of this equipment is governed by our standard terms and conditions of sale which can be found on the reverse of all order acknowledgements proforma invoices delivery notes price lists and invoices Alternatively these can be provided on request Faxed proforma invoices and quotations refer to conditions available upon request Important Safety Information Scope products are designed to operate safely when installed and used according to general safety practices The following requirements should be observed at all times Do NOT subject this equipment to Mechanical shock excessive humidity or moisture extremes of temperature or corrosive liquids This equipment is designed for indoor use unless expressly stated otherwise and must not be used in classified Hazardous Areas including areas containing explosive or flammable vapours unless express authorisation has been given in writing by the manufacturer If in doubt consult your local product dealer for further information Do not obstruct any slots or openings in the product These are provided for ventilation to ensure reliable operation of the product and to protect it from overheating Only use a damp cloth for cleaning not liquid or aerosol based cleaners and ensure that any power is removed from the unit prior to beginning the cleaning operation Removal of covers from the equipment must only be undertaken by authorised service personnel who mus
10. t ensure that power is isolated prior to removal Ref RX4USER Page 2 of 8 Issue 1 PRX4 amp PRX4SERL Four Zone Receiver Decoder Installation Installation must only be undertaken by an Approved contractor who shall ensure that all work is carried out in compliance with National Wiring Regulations For mains powered equipment a readily accessible isolating fuse or switched socket must be located within 1 metre of the equipment No User Serviceable Parts Alteration or modification to any part of this equipment without the prior written consent of the manufacturer will invalidate all Approvals and Warranties attaching to the equipment Further liability for the operation of the equipment under the applicable law will pass to the user who will absolve the manufacturer of any further responsibility for it s correct operation and use Liability Scope does not accept liability for any damage or injury howsoever caused as the result of misuse of this equipment It is the responsibility of the user to ensure that the equipment is operated in the manner for which it was intended and that it is the correct item of equipment for the required task Warranty This product is warranted as free from defects of workmanship and materials for a period of one year from the original purchase date During this time if there is a defect or malfunction of this product Scope will with proof of purchase repair or replace at it s discretion any d
11. ter over the air baud rate All these features are factory set so they need to be specified at the time of order placement Ref RX4USER Page 6 of 8 Issue 1 PRX4 amp PRX4SERL Four Zone Receiver Decoder Over the air reset transmitting capcode 0000008 will reset the unit and de energise all the relays Note where the serial port has been set to output Scope protocol it must be connected to a valid serial port for this feature to operate The unit can also be reset by depressing SW1 through the hole provided on the lower endplate see Diagram 1 below Ref RX4USER Page 7 of 8 Issue 1 PRX4 amp PRX4SERL Four Zone Receiver Decoder Specification Power Input Power Consumption Standby relays off no serial port Standby relays off serial port connected Active serial decoder Active all relays Signal Format Frequency fixed crystal Frequency Stability Channel Spacing Frequency Deviation Over Air Baud Rate fixed programmable Sensitivity 512bps 1200bps Selectivity Image Rejection Spurious Rejection Intermodulation Relay Contact max rating Serial Port Serial Configuration Serial Port baud rate 12V to 13 8V dc max 0 5A 28mA 38mA 63mA 250mA POCSAG FSK NRZ Normal or Inverted In the range 440 470MHz 10ppm 12 5 or 25KHz 4 5KHz 512 or 1200 bps Maximum 6uV m 7 5uV m gt 52dB gt 52dB gt 60dB gt 52dB 0 5A 125V ac 1A 60V dc RS232 N 8 1
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