GD-04 - "David" GSM communicator - manual
Contents
1. s settings is not stored on the web server only in your David This makes the web access to your David both secure and simple 6 2 Using a PC running GDLink software If you need to program David frequently connecting David to a PC running specialized software is the recommended option GDLink software allows you not only to send programming instructions but also to retrieve the current David settings For the PC connection you can use a GD 04P link cable connected to a USB port the cable is supplied separately GDLink software is available either in the GD 04P s package or on the www jablotron com web site 6 3 SMS instructions David can also be configured via SMS instructions from your mobile phone The programming instruction format is explained in the following example PC ARX heating on DRX heating off where PC is the access programming code required at the start of any programming SMS message 2 to 8 ASCII characters the factory default setting is PC j is a comma separator ARX is the name of the instruction for programming the text you wish to use for switching relay X on via SMS The desired text heating on follows separated by a comma DRX is similar to ARX related to switching relay X off The above SMS instruction tells David that the X relay can be switched on off by the SMS instructions heating on heating off Note This text distinguishes between SMS messages and SMS instructions an SMS2. Y0 GSM 80 Vcc 12 2V which means that all A to D inputs and both the X and Y relays are switched off the GSM signal strength is 80 and the power supply voltage is 12 2V Depending on the GSM network traffic the response may take some time f no response occurs verify that STATUS is spelt exactly right in the text of the message and that you are sending the message to David s correct SIM card number repeat the previous step 6 Programming 6 1 Via the Internet The simplest way to program David is via the web site www david jablotron cz You fill in all the required parameters in a form on a single web page press the Send button and the Jablotron web server will forward the settings to your David via the GSM network Performance of a successful transfer is confirmed from David by an SMS reply PROGRAM OK to your mobile phone GD 04 DAVID 3 MKS51204 All parameters are sufficiently described on the page so that you do not need to use David s installation or user manual to perform programming Programming via the web site is free of charge No user registration is required Your David s settings are not stored on the web server Instead you can save them as a file in your computer for future use the file can then be imported to the page The page does not allow you to retrieve the current settings of your David Any programming is only possible if a valid access code default PC is specified the code being a part of David
3. series assigned to it see 11 3 2 e Enroll a thermostat to any of the A B C or D inputs to get reports about exceeding the maximum minimum allowable temperature limits in your house o Exceeding the upper temperature limit e g 60 C is responded to by an SMS report about input activation o Dropping under the lower temperature limit e g 3 C is responded to by an SMS report about input de activation GD 04 DAVID 8 MKS51204 e Enroll a thermostat to one of the A or B inputs to take control of the temperature in your house An A assigned thermostat controls relay X a B assigned thermostat controls relay Y This way heating control is established supplemented by the reporting described above Thermostats enrolled to C or D inputs only provide reporting e Normally an A or B enrolled thermostat switches the heating via the X or Y relay so that temperature comfort is maintained However you can put the heating in economic mode by sending an SMS instruction for switching relay X or Y on which puts the heating back to normal mode The same can be done by connecting the A or B input to GND The thermostat will then only provide anti freeze protection the heating will be switched on when a critically low temperature is signalled e g 6 C Sending an SMS instruction for switching relay X or Y off puts the heating back to normal mode with A or B disconnected from GND e lf input A or B is used for thermostat enrollment the status SMS re
4. to the X output send enrollment signals to the module see notes below Press the XY button again to allow enrolling to the Y output A change of flashing rate indicates this Enrollment is confirmed by a long flash of the LED on the GD 04R Important Enrolling the first device erases all the previously enrolled devices Thus all the desired devices should be enrolled in a single enrollment session 4 Exit enrollment mode by pressing the XY button enrollment is automatically terminated after the fourth device has been assigned or after 40 seconds 5 After enrollment mode termination the LED on the module lights for approx 5 seconds to indicate enrollment data storage Notes e Ifthe two buttons A and B are present on an RC 8x controller the device can be enrolled by pressing and holding both buttons at the same time for approx 6 seconds Button A then switches on an output button B switches off an output and A B changes toggles the status of an output switch on switch off e For single button controls such as the RC 87 or RC 89 the device can be enrolled by pressing and holding the button for approx 6 seconds Pressing the button then changes the status of an output switch on switch off To delete all enrolled items press and hold buttons XY and ABCD until two long flashes occur on the red LED 11 3 4 Using David for heating operation and status reporting Each input A D can have a wireless thermostat of the TP 8x
5. Mobile phone directed intelligent controller and reporter DAViD Flexible device with useful features na JABLOTRON The GD 04 David GSM communicator User manual The GD 04 module got its name from David a biblical king who outsmarted Goliath a giant In our case Goliath is meant to be the GSM network We hope that the skills of your tiny David will help you manage the giant 1 Basic description GSM antenna SIM card a RESET jumper Bus connector LED indicator Battery connection N E Output fuses 1 1 David provides e 2 output contacts of power relays X and Y each allows up to 5A 250V e 4 input terminals A to D for SMS reporting the inputs react to a connection or disconnection to or from a common GND terminal GD 04 DAVID 1 MKS51204 1 2 David can be used as A switch with SMS remote control SMS texts for switching particular terminals on off are configurable A time switch which can be activated remotely via a mobile phone the switch on period is configurable from 1 second to 10 hours A relay with dialling in remote control Up to 50 tel numbers can be authorized for each relay Because calls are not answered dialling in control within GSM is free of charge David only checks the callers number and if the number is authorized responds with relay activation This can be used for parking latch control etc A relay with validi
6. OASIS wireless device assigned to it This way triggering an external wireless device has the same effect as GD 04 input activation by physical connection to GND effectively making the inputs radio signal activated Take the following steps to enroll a device 1 Press and hold the ABCD button on the GD 04R module 2 Entering enrollment mode is indicated after 5 seconds by flashing of the LED on the GD 04R module release the button 3 Enroll up to 4 wireless devices to the GD 04R send enrollment signals to the module The first device is assigned to the A input the second one to the B input etc Wireless detectors are enrolled by inserting their batteries for wireless buttons see below Enrollment is confirmed by a long flash from the LED on the GD 04R Important Enrolling the first device erases all the previously enrolled devices Thus all the desired devices should be enrolled in a single enrollment session 4 Exit enrollment mode by pressing the ABCD button enrollment is automatically terminated after the fourth device has been assigned or after 40 seconds 5 After enrollment mode termination the LED on the module lights for approx 5 seconds to indicate enrollment data storage Notes e If the two buttons A and B are present on an RC 8x controller the device can be enrolled by pressing and holding both buttons at the same time for approx 6 seconds The operational GD 04 DAVID 7 MKS51204 logic is then as follows pres
7. Terminate the call David automatically terminates the call after 60 seconds e After the call has been terminated David reports the current relay status via SMS Note Too weak a GSM signal in David s or your location may result in DTMF control malfunctions 11 3 The GD 04R radio module By plugging the GD 04R radio module into the digital bus connector after the power supply has been disconnected your David acquires the following capabilities e Relay X and Y state transmission to UC or AC OASIS wireless receivers XY ABCD e Input A to D activations via RC 8x OASIS wireless buttons or via JA 8x OASIS wireless detectors GD 04R e Relay X or Y control via RC 8x OASIS wireless buttons module e Relay X or Y control via a TP 8x wireless thermostat The module has a built in internal antenna If necessary a Jablotron external antenna of type AN 80 or AN 81 can be applied to extend David s remove it if working range external antenna Note The external antenna is always needed when the GD 04A back up module is used 11 3 1 Transmitting X or Y relay status to an UC 82 or AC 82 receiver Enter mode 4 on the receiver and press the XY button on David s GD 04R module This establishes a connection so that the receiver s relay status mirrors David s relay status There is no limit to the number of UC AC receivers which can be connected this way 11 3 2 Wireless device input assignment and operation Each input A to D can have one
8. ay Y X X tel number The numbers are added to the list of authorised numbers up to 50 in total n limit in the number of calls 1 to 99 exceeding the limit removes the number from the list this is reported to the service number by SMS Example LDX 777123457 31 authorises a new number for relay X control for a maximum of 31 calls empty list Erasing tel numbers authorised for relay control EDX x X X X Use EDY for relay Y x x tel number The numbers up to 50 are removed from the list Example EDX 777123457 de authorises a single tel number used for relay X control Input A to D activation deactivation SMS reports Input activation text ATA xx X Use ATB for input B etc xxx X text up to 30 characters Example ATC heating on Instruction ATA erases the text no reports Input deactivation text DTA xx X Use DTB for input B etc XXxX X text up to 30 characters Example DTC heating off Instruction DTA erases the text no reports Telephone numbers for input reports TNA x X X X Use TNB for input B etc x X tel number up to 8 for each input All previously stored numbers are erased Use TNA to empty the list Example TND 777123456 608123456 sets David to report input D events to 2 numbers Input event calls DNA n Use TNB for input B etc n 1 ON 0 OFF If set to ON every SMS report is follo
9. can be programmed for each relay e Each tel number can have a limit to the number of calls so that any further calls are ignored e This feature is not applicable to phones with withheld numbers e Dialling in relay control can be reported by SMS 9 Using prepaid SIM cards Prepaid SIM cards are NOT recommended for use in David because they increase the risk of David malfunctioning due to a possible credit balance under run or expiration of the time limit If you still decide to use a prepaid SIM card you can configure David for periodic balance interrogation If the reported credit balance is lower than the set limit the credit balance message will be automatically sent to the service phone numbers To program this feature you need to know some data specific to the GSM provider see the SIM card documentation The programming instruction is of the following form PC CRD xxxx dd hhh pp where PC is the access code CRD is the name of the instruction for credit balance interrogation xxxx is the command string to ascertain the credit GSM network specific e g 104 dd is the auto interrogation frequency in days hhh is the minimum acceptable credit balance GD 04 DAVID 5 MKS51204 pp is the textual position at which the number showing the balance starts in the reply message from the GSM provider Example If you require at least 50 of credit balance and the USSD code used to query the available balance is 104 and you want a wee
10. eat the procedure according to steps 3 to 5 7 Your PC now has two new devices after successful installation Jablotron serial interface as a serial port COM driver and the USB device with the same name as the driver for USB 8 Install the GDLink software on your PC 9 Connect the GD 04P cable into David s digital bus connector GDLink is now ready to be started 11 4 6 Using GDLink e The program allows for o Retrieval and modification of David settings o Displaying the last 127 memorized events o Relays X and Y direct control o Inputs A to D status display e A comprehensible help option is provided as a part of the program Rwa a GD 04 DAVID 9 MKS51204 12 Specification Power supply 11 13 VDC Stand by consumption approx 20 mA Max consumption during communication 500 mA GSM band E GSM 850 900 1800 1900 MHz RF output power 2 W for GSM 850 900 1 W for GSM 1800 1900 A B C and D input terminals activated by a connection to GND Output contact rating X1 X2 a Y1 Y2 Resistive load max 2 5A 250V AC Inductive capacitive lamp load max 0 5A 250V AC Can be operated according to ERC DEC 94 01 Safety EN 60950 1 EMC EN 301489 7 EN 55022 and EN 50130 4 Radio transmissions ETSI EN 301419 1 and EN 301511 Environment Il indoor general 10 C to 40 Dimensions without antenna 76 x 110 x 33 mm GSM antenna connected to SMA connector is in compliance with the essential requirements and other
11. eporting of relay dialling in control f SMS reporting of relay SMS control e g heating off OK g Input terminal GND connection disables any wireless connection to the input not applicable to thermostats Example DIP 1 x x x x 1 x Use CAY for relay Y XX X numeric code up to 8 digits Example CAY 1234 Instruction CAY erases the code Use CDY for relay Y XX X numeric code up to 8 digits Example CDY 1234 Instruction CDY erases the code n A B C D XorY input or output the device should be assigned to XxX X device production code last 8 digits Only one device can be assigned to each A to D input whereas each of X or Y relays can have up to 4 devices enrolled Example LRN A xx x B XX X X Xx X Instruction LRN erases all assignments A device cannot have multiple assignments The order of A to Y is arbitrary no duplications are allowed David will unregister and then re register to the GSM network This can be useful after a blocked SIM card has been unblocked A re registration is also triggered by briefly connecting the RESET jumper while David is being powered up Resets David to the factory default settings This can also be performed by connecting the RESET jumper during powering up disconnect the jumper after approx 5 sec PC STATUS none 0000000 all OFF none none none 1 Only available for the GD 04A version Only available for the GD 04D v
12. er supply on until all input output wiring 12V DC GND has been done power supply 12 circuits which the contacts belong to are protected from the remaining m electronics by a safety separator Y2 and are capable of switching up to 2 5A at 250V AC The following Light bulb example shows a light bulb control via the Y output relay 2 Output relay contacts available 230y 50Hz at the X1 X2 and Y1 Y2 terminals Ex Each contact is fused to 5A The x2 P Switch E b 3 Input terminals marked A to D The terminals respond to a H connection or disconnection to or from GND by sending an SMS M c 9 report No external voltage supply can be connected to these fi gt 0 terminals they can only be controlled via a_potential free jaw B switch contact Example of wiring a switch to input A m20 5 Initial powering up 1 Turn the power supply on registering to the GSM network is indicated by the LED flashing if no indication occurs check the power supply wiring 2 After GSM registration the LED stops flashing usually within 1 minute Continued flashing indicates a GSM registration fault Disconnect the power supply and check that a valid SIM card has been correctly installed into the device see 2 and 3 3 Send the SMS instruction STATUS to David s SIM card number 4 David responds by a status report e g STATUS A0 B0 C0 D0 X0
13. ersion 3 Only available for the GD 04R version N J ABLOTRON ALARMSa s ae Pod Skalkou 4567 33 46601 Jablonec nad Nisou Czech Republic Tel 483 559 911 Fax 483 559 992 iasioTRAN Intemet www jablotron cz
14. gramming SMS instructions Any programming SMS message must start with a valid access code see 6 3 Example PC ARX heating on DRX heating off Function Instruction Description Factory default Relays X and Y operation SMS to switch relay ON ARX xxx X Use ARY for relay Y xxx x text up to 30 characters text erased by ARX Example ARY ventilator on erased SMS to switch relay OFF DRX xxx X Use DRY for relay Y Xxx x text up to 30 characters text erased by DRX Example DRY ventilator off erased Relay switch on period TMX t t Use TMY for relay Y t t switch on period in seconds or zero e 1 to 10h entered in seconds minutes m or hours h 3600s 60m 1h e The relay works as a time switch activated via switch on SMSes or dialling in Deactivation is by time limit expiration or via switch off SMSes e 0 no time limit applies dialling in is responded to with toggle logic on off on 0 no limit Telephone numbers authorised for relay control ADX x X X X Use ADY for relay Y X X tel number Up to 50 numbers can be entered in a single instruction or gradually The numbers are added to the list of authorised numbers Example ADX 777123456 420608503211 authorises two new numbers for relay X control Telephone numbers authorised for relay control with a validity limit LDX x x n X X N Use LDY for rel
15. kly interrogation frequency use the following instruction PC CRD 104 7 50 01 If you do not want automatic interrogation you can program David to report the balance in response to your SMS instruction PC CRD The programming is achieved by a programming instruction according to the following example PC CRD 104 0 0 0 Note David s SIM card balance interrogation may stop working due to changes in GSM services e g a different response format You should therefore be acquainted with the methods your GSM provider uses or will use for querying the available balance 10 Reset to factory defaults You can reset David to the factory default settings via the SMS instruction PC RST where PC is a valid access code see Table 1 Another option is to use the RESET jumper next to the SIM case a Turn the power supply off including the backup module if used b Connect the RESET jumper turn the power supply on and disconnect the jumper after about 5s Note Performing a RESET erases all programmed tel numbers and texts 11 Optional accessories David s functionality can be extended by optional modules or other separately supplied accessories 11 1 The GD 04A back up module This module is imbedded in a specially enlarged replacement cover Installation is performed by replacing the original cover together with wiring the GD 04A module to the GD 04 circuit board via the corresponding connector The backup batter
16. le phone and a keyfob The module also allows heating control again locally or remotely via a mobile phone using wireless thermostats of the TP 8x series see 11 3 A detailed description of optional accessories can be found in chapter 11 2 David s SIM card In order to function David needs a SIM card preferably a tariffed one Test the SIM card by using it in your mobile phone SMS sending and calling must work correctly Switch off the PIN code protection via the phone menu or set the PIN code to 1234 Check the GSM signal strength in David s location 3 Installation 1 The GSM antenna should not be shielded by metals If necessary an external antenna designed for the 900 1800MHz GSM band can be connected via a 500 SMA connector 2 Open the cover and release the electronic circuit board by pressing the tabs 3 Mount the rear plastic cover at the desired location 4 Insert a SIM card Open the SIM card case by shifting the moving part in the direction of the terminals and tipping it off Make sure that the card is correctly oriented and insert it Close the SIM card case fold and re shift the moving part GD 04 DAVID 2 MKS51204 5 Insert the circuit board back to its position 6 Do the wiring see below 4 Wiring 1 Power supply use the 12V and GND terminals grey colour 12V Any power supply adapter used should E D provide 12V DC voltage and up to 500mA of current Do gt not turn the pow
17. message can contain multiple SMS instructions in a sequence SMS instruction rules 1 Any programming SMS message must start with a valid access code the factory default code is PC Multiple messages mean multiple codes 2 A single message can contain multiple instructions David is capable of long message processing if enabled by your phone you can write and send a programming SMS message containing up to 2400 ASCII characters 3 The comma separator is used both between individual instructions and between individual segments within instructions 4 Spaces are ignored except in operational texts which are meant to be a part of a David setting 5 The successful processing of a programming SMS is confirmed from David by the SMS reply PROGRAM OK 6 When an error is encountered David reports a PROGRAM ERROR followed by the text of the instruction which has not been recognized Preceding instructions within the message are carried out succeeding instructions are ignored 7 David is not case sensitive does not distinguish between lowercase and UPPERCASE letters GD 04 DAVID 4 MKS51204 8 The use of accented characters is not recommended 9 Afteran SMS message has been received David switches off both the X and Y relays 10 See table 1 for a brief instruction list 7 Remote operation via SMS instructions When using texts which have been programmed for David SMS operation relay control status interrogation
18. port obtained from David on an SMS request contains information about the temperature Example STATUS A0 B0 C0 D0 X1 Y0 GSM 70 TA 25 24C TB 22 22C Vcc 12 2V where TA labels data from thermostat A TB labels data from thermostat B The data is of the form maintained temperature measured temperature e Enrolling a thermostat to the A or B input disables relay X or Y enrollments e DIP switch g setting has no effect on enrolled thermostat operation To delete all enrolled items press and hold buttons XY and ABCD until two long flashes occur on the red LED 11 4 The GD 04P link cable The GD 04P cable allows you to link David with a PC through an USB port and perform any desired configuration using GDLink software The software is supplied on a CD in the package together with all the necessary drivers You can also download GDLink from www jablotron com 11 4 5 Installing GDLink and the drivers Connect the GD 04P cable to a free USB port on your PC and insert the CD into the CD drive Wait for New Hardware Wizard to start up Search for the drivers on the removable medium CD When installing for WIN XP ignore the notification about wrong authenticity with WIN XP and continue with the installation process Leave the other parameters without any modifications Finish the new hardware installation wizard process 6 There are two devices contained in one so please wait for the New hardware wizard to start again Rep
19. relevant provisions of Directive 1999 5 EC The original of the conformity assessment can be found on the web site www jablotron com Technical Support section a Note Although this product does not contain any harmful materials we suggest you return the product to the dealer or directly to the manufacturer after use C JABLOTRON ALARMS a s hereby declares that this product GD 04 DAVID 10 MKS51204 Input s SMS reports David s settings SMS when activated SMS when deactivated Input A Phone numbers SMS when activated SMS when deactivated Input B Phone numbers SMS when activated SMS when deactivated Input C Phone numbers SMS when activated SMS when deactivated Input D Phone numbers Rel ays operation ON command SMS DTMF code OFF command SMS DTMF code Relay X Tel numbers authorized for relay control ON command SMS DTMF code OFF command SMS DTMF code Relay Y Tel numbers authorized for relay control Wireless items Only available for the GD 04D version Enrolled Type Device code Place Input A Input B Input C Input D Relay X Relay Y GD 04 DAVID 11 7 Only available for the GD 04R version MKS51204 Table 1 A brief list of pro
20. sing A or A B is responded to by an SMS report about input activation a connection to GND Pressing the B button is responded to by an SMS report about input deactivation a disconnection from GND e For single button controls such as the RC 87 or RC 89 the device can be enrolled by pressing and holding the button for approx 6 seconds Pressing the button is then responded to by an SMS report about input activation e Enrolled JA 8x detectors work with the following logic o Input activation is reported by SMS in response to detector triggering body movement door opening breaking glass fire tamper o Input deactivation is reported by SMS in response to panic signals or to the de triggering of state providing detectors JA 8xM e Wireless devices can also be assigned by entering their production code using the LRN instruction e An input terminal with a wireless device assigned to it can be configured see Optional functions DIP parameter g so that connection to GND disables the reception of wireless signals This feature allows the setting unsetting of enrolled detectors 11 3 3 Controlling the outputs using an RC 8x wireless button unit Each X or Y output can have four OASIS wireless button units assigned to it 1 Press and hold the XY button on the GD 04R module 2 Entering enrollment mode is indicated after 5 seconds by flashing of the LED on the GD 04R module release the button 3 Enroll up to 4 wireless button units
21. the following conditions apply e David does not distinguish between authorized and unauthorized phones when processing operational SMS instructions Instructions can be sent from any phones but the texts must match the texts which have been pre programmed except the lowercase UPPERCASE attribute Access codes are NOT part of operational SMSes e A single SMS message can contain multiple instructions separated by commas e g HEATING ON LIGHTS OFF STATUS e David can be so configured that every instruction performance is reported by SMS e Received SMSes with unrecognised instructions can be forwarded to the so called service number see table 1 e If you are not sure whether any other text will be automatically added to the SMS on its way to David for example when using an SMS internet gate type the message like this instructions Example The SMS text 7 1 www heating on is interpreted as heating on 8 Remote operation via dialling in David allows you to control the X and Y relays via dialling in from pre authorised phones If a call is made to David from a pre programmed number the call is rejected and the relay reacts as follows o Ifa limit is set to the relay switch on period then the relay switches on for the limit period o If no limit is set zero value is set for the limit then the relay switches on permanently until a switch off SMS instruction or another dialling in event occurs Notes e Up to 50 tel numbers
22. ty limited dialling in remote control Each authorized number can have a limit to the number of calls When the call count reaches the limit the tel number is de authorized This can be useful for pre paid services such as e g parking Any tel number can be re authorized via SMS by the administrator An SMS reporter Input A to D activations or deactivations can be reported by SMS and optionally confirmed by phone calls Each input can have its own message texts and up to 8 tel numbers programmed Examples of David applications can be found on http www jablotron cz david en examples htm 1 3 David can be supplemented with A GD 04A back up module which provides David with the ability to work approx 12 to 24 hours continually without an external power supply see 11 1 A GD 04D DTMF module which allows you to control David s output relays by entering numeric codes DTMF codes on the telephone keypad during calls see 11 2 A GD 04P link cable which allows you to connect David to a PC through a USB port and perform any desired configuration using GDLink software see 11 4 A GD 04R radio module which allows input A to D activations via wireless buttons or detectors of the OASIS series and also provides David with the capability of output relay X or Y state transmission to UC or AC OASIS receivers In addition you can control relays X or Y locally via RC 8x keyfobs so that an appliance can be controlled both via a mobi
23. wed by a call If you answer the call you hear a constant tone activation or an interrupted tone deactivation Example DND 1 OFF GD 04 DAVID 12 MKS51204 Additional functions New access code NPC xx X SMS to get David s status STS xx X Service tel numbers STN x X X X Optional functions DIP a b c d e f g DTMF code to switch relay CAX xx x ON DTMF code to switch relay CDX xx x OFF Wireless device LRN n xx x n X assignments Triggering re registration to GSM the GSM network Reset RST XX X new access code 2 to 8 characters Example NPC MARTIN27 XXx X text up to 30 characters Example STS HOW ARE YOU NOW xxxX X tel number Up to 2 numbers can be set previously set numbers are erased Service numbers are used to report faults POWER FAIL POWER RECOVERY LINE OK GSM signal recovery THERMOSTAT FAILED lost communication LOWBATT low battery in any wireless device Other events see Optional functions Instruction STN erases service number s Parameter a to f values can be 1 ON 0 OFF x unchanged Description of the parameters a Forward unrecognised SMSes to the service number including phone number b Periodic calls to the service number every 24 hours from the moment of being set c Forward all SMSes to the service number d Max 10 SMSes within 15 minutes all subsequent SMS requests ignored e SMS r
24. y requires approx 72 hours to be fully charged The battery provides approx 12 to 24 hours of backup operation depending on the output relay state and on the GSM signal strength as with any GSM device David s consumption is higher in places with a low signal level as the transmitter power has to be increased Only David s electronics is backed up No voltage is available on the 12V terminal during backup operation Discharging the battery causes David to be switched off including the X and Y relays After the recovery of the main power supply David will switch on but the relays stay switched off and starts charging the battery The message POWER FAIL or POWER RECOVERY is sent to the service number STN 11 2 The GD 04D DTMF module The GD 04D allows relay X and Y control by entering numeric codes DTMF codes on the telephone keypad during calls The DTMF codes intended for use have to be programmed see table 1 The module can be installed by plugging in to the appropriate digital bus connector after the power supply has been disconnected GD 04 DAVID 6 MKS51204 11 2 1 DTMF relay control e Call David s tel number After about 7 seconds David responds with a beep on the line this means that the call has been answered followed by relay X and Y status indication in this order 2 short beeps OFF 1 long beep ON e Enter the DTMF code A relay switch on is confirmed by a long beep a switch off by two short beeps e
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